\nCanonicalHeaders =\n CanonicalHeadersEntry0 + CanonicalHeadersEntry1 + ... + CanonicalHeadersEntryN\nCanonicalHeadersEntry =\n Lowercase(HeaderName) + ':' + Trimall(HeaderValue) + '\\n'\n\n*/\n\n\nvar canonical_headers = function canonical_headers(headers) {\n if (!headers || Object.keys(headers).length === 0) {\n return '';\n }\n\n return Object.keys(headers).map(function (key) {\n return {\n key: key.toLowerCase(),\n value: headers[key] ? headers[key].trim().replace(/\\s+/g, ' ') : ''\n };\n }).sort(function (a, b) {\n return a.key < b.key ? -1 : 1;\n }).map(function (item) {\n return item.key + ':' + item.value;\n }).join('\\n') + '\\n';\n};\n/**\n * List of header keys included in the canonical headers.\n * @access private\n */\n\n\nvar signed_headers = function signed_headers(headers) {\n return Object.keys(headers).map(function (key) {\n return key.toLowerCase();\n }).sort().join(';');\n};\n/**\n* @private\n* Create canonical request\n* Refer to\n* {@link http://docs.aws.amazon.com/general/latest/gr/sigv4-create-canonical-request.html|Create a Canonical Request}\n*\n
\nCanonicalRequest =\n HTTPRequestMethod + '\\n' +\n CanonicalURI + '\\n' +\n CanonicalQueryString + '\\n' +\n CanonicalHeaders + '\\n' +\n SignedHeaders + '\\n' +\n HexEncode(Hash(RequestPayload))\n\n*/\n\n\nvar canonical_request = function canonical_request(request) {\n var url_info = url.parse(request.url);\n return [request.method || '/', encodeURIComponent(url_info.pathname).replace(/%2F/gi, '/'), canonical_query(url_info.query), canonical_headers(request.headers), signed_headers(request.headers), hash(request.data)].join('\\n');\n};\n\nvar parse_service_info = function parse_service_info(request) {\n var url_info = url.parse(request.url),\n host = url_info.host;\n var matched = host.match(/([^\\.]+)\\.(?:([^\\.]*)\\.)?amazonaws\\.com$/);\n var parsed = (matched || []).slice(1, 3);\n\n if (parsed[1] === 'es') {\n // Elastic Search\n parsed = parsed.reverse();\n }\n\n return {\n service: request.service || parsed[0],\n region: request.region || parsed[1]\n };\n};\n\nvar credential_scope = function credential_scope(d_str, region, service) {\n return [d_str, region, service, 'aws4_request'].join('/');\n};\n/**\n* @private\n* Create a string to sign\n* Refer to\n* {@link http://docs.aws.amazon.com/general/latest/gr/sigv4-create-string-to-sign.html|Create String to Sign}\n*\n
\nStringToSign =\n Algorithm + \\n +\n RequestDateTime + \\n +\n CredentialScope + \\n +\n HashedCanonicalRequest\n\n*/\n\n\nvar string_to_sign = function string_to_sign(algorithm, canonical_request, dt_str, scope) {\n return [algorithm, dt_str, scope, hash(canonical_request)].join('\\n');\n};\n/**\n* @private\n* Create signing key\n* Refer to\n* {@link http://docs.aws.amazon.com/general/latest/gr/sigv4-calculate-signature.html|Calculate Signature}\n*\n
\nkSecret = your secret access key\nkDate = HMAC(\"AWS4\" + kSecret, Date)\nkRegion = HMAC(kDate, Region)\nkService = HMAC(kRegion, Service)\nkSigning = HMAC(kService, \"aws4_request\")\n\n*/\n\n\nvar get_signing_key = function get_signing_key(secret_key, d_str, service_info) {\n logger.debug(service_info);\n var k = 'AWS4' + secret_key,\n k_date = encrypt(k, d_str),\n k_region = encrypt(k_date, service_info.region),\n k_service = encrypt(k_region, service_info.service),\n k_signing = encrypt(k_service, 'aws4_request');\n return k_signing;\n};\n\nvar get_signature = function get_signature(signing_key, str_to_sign) {\n return encrypt(signing_key, str_to_sign, 'hex');\n};\n/**\n * @private\n * Create authorization header\n * Refer to\n * {@link http://docs.aws.amazon.com/general/latest/gr/sigv4-add-signature-to-request.html|Add the Signing Information}\n */\n\n\nvar get_authorization_header = function get_authorization_header(algorithm, access_key, scope, signed_headers, signature) {\n return [algorithm + ' ' + 'Credential=' + access_key + '/' + scope, 'SignedHeaders=' + signed_headers, 'Signature=' + signature].join(', ');\n};\n/**\n * AWS request signer.\n * Refer to {@link http://docs.aws.amazon.com/general/latest/gr/sigv4_signing.html|Signature Version 4}\n *\n * @class Signer\n */\n\n\nvar Signer =\n/** @class */\nfunction () {\n function Signer() {}\n /**\n * Sign a HTTP request, add 'Authorization' header to request param\n * @method sign\n * @memberof Signer\n * @static\n *\n * @param {object} request - HTTP request object\n
\n request: {\n method: GET | POST | PUT ...\n url: ...,\n headers: {\n header1: ...\n },\n data: data\n }\n \n * @param {object} access_info - AWS access credential info\n \n access_info: {\n access_key: ...,\n secret_key: ...,\n session_token: ...\n }\n \n * @param {object} [service_info] - AWS service type and region, optional,\n * if not provided then parse out from url\n \n service_info: {\n service: ...,\n region: ...\n }\n \n *\n * @returns {object} Signed HTTP request\n */\n\n\n Signer.sign = function (request, access_info, service_info) {\n if (service_info === void 0) {\n service_info = null;\n }\n\n request.headers = request.headers || {}; // datetime string and date string\n\n var dt = new Date(),\n dt_str = dt.toISOString().replace(/[:\\-]|\\.\\d{3}/g, ''),\n d_str = dt_str.substr(0, 8);\n var url_info = url.parse(request.url);\n request.headers['host'] = url_info.host;\n request.headers['x-amz-date'] = dt_str;\n\n if (access_info.session_token) {\n request.headers['X-Amz-Security-Token'] = access_info.session_token;\n } // Task 1: Create a Canonical Request\n\n\n var request_str = canonical_request(request);\n logger.debug(request_str); // Task 2: Create a String to Sign\n\n var serviceInfo = service_info || parse_service_info(request),\n scope = credential_scope(d_str, serviceInfo.region, serviceInfo.service),\n str_to_sign = string_to_sign(DEFAULT_ALGORITHM, request_str, dt_str, scope); // Task 3: Calculate the Signature\n\n var signing_key = get_signing_key(access_info.secret_key, d_str, serviceInfo),\n signature = get_signature(signing_key, str_to_sign); // Task 4: Adding the Signing information to the Request\n\n var authorization_header = get_authorization_header(DEFAULT_ALGORITHM, access_info.access_key, scope, signed_headers(request.headers), signature);\n request.headers['Authorization'] = authorization_header;\n return request;\n };\n\n Signer.signUrl = function (urlOrRequest, accessInfo, serviceInfo, expiration) {\n var urlToSign = typeof urlOrRequest === 'object' ? urlOrRequest.url : urlOrRequest;\n var method = typeof urlOrRequest === 'object' ? urlOrRequest.method : 'GET';\n var body = typeof urlOrRequest === 'object' ? urlOrRequest.body : undefined;\n var now = new Date().toISOString().replace(/[:\\-]|\\.\\d{3}/g, '');\n var today = now.substr(0, 8); // Intentionally discarding search\n\n var _a = url.parse(urlToSign, true, true),\n search = _a.search,\n parsedUrl = __rest(_a, [\"search\"]);\n\n var host = parsedUrl.host;\n var signedHeaders = {\n host: host\n };\n\n var _b = serviceInfo || parse_service_info({\n url: url.format(parsedUrl)\n }),\n region = _b.region,\n service = _b.service;\n\n var credentialScope = credential_scope(today, region, service); // IoT service does not allow the session token in the canonical request\n // https://docs.aws.amazon.com/general/latest/gr/sigv4-add-signature-to-request.html\n\n var sessionTokenRequired = accessInfo.session_token && service !== IOT_SERVICE_NAME;\n\n var queryParams = __assign(__assign(__assign({\n 'X-Amz-Algorithm': DEFAULT_ALGORITHM,\n 'X-Amz-Credential': [accessInfo.access_key, credentialScope].join('/'),\n 'X-Amz-Date': now.substr(0, 16)\n }, sessionTokenRequired ? {\n 'X-Amz-Security-Token': \"\" + accessInfo.session_token\n } : {}), expiration ? {\n 'X-Amz-Expires': \"\" + expiration\n } : {}), {\n 'X-Amz-SignedHeaders': Object.keys(signedHeaders).join(',')\n });\n\n var canonicalRequest = canonical_request({\n method: method,\n url: url.format(__assign(__assign({}, parsedUrl), {\n query: __assign(__assign({}, parsedUrl.query), queryParams)\n })),\n headers: signedHeaders,\n data: body\n });\n var stringToSign = string_to_sign(DEFAULT_ALGORITHM, canonicalRequest, now, credentialScope);\n var signing_key = get_signing_key(accessInfo.secret_key, today, {\n region: region,\n service: service\n });\n var signature = get_signature(signing_key, stringToSign);\n\n var additionalQueryParams = __assign({\n 'X-Amz-Signature': signature\n }, accessInfo.session_token && {\n 'X-Amz-Security-Token': accessInfo.session_token\n });\n\n var result = url.format({\n protocol: parsedUrl.protocol,\n slashes: true,\n hostname: parsedUrl.hostname,\n port: parsedUrl.port,\n pathname: parsedUrl.pathname,\n query: __assign(__assign(__assign({}, parsedUrl.query), queryParams), additionalQueryParams)\n });\n return result;\n };\n\n return Signer;\n}();\n\nexport default Signer;","import { ConsoleLogger as Logger } from './Logger';\nvar logger = new Logger('Parser');\n\nvar Parser =\n/** @class */\nfunction () {\n function Parser() {}\n\n Parser.parseMobilehubConfig = function (config) {\n var amplifyConfig = {}; // Analytics\n\n if (config['aws_mobile_analytics_app_id']) {\n var Analytics = {\n AWSPinpoint: {\n appId: config['aws_mobile_analytics_app_id'],\n region: config['aws_mobile_analytics_app_region']\n }\n };\n amplifyConfig.Analytics = Analytics;\n } // Auth\n\n\n if (config['aws_cognito_identity_pool_id'] || config['aws_user_pools_id']) {\n var Auth = {\n userPoolId: config['aws_user_pools_id'],\n userPoolWebClientId: config['aws_user_pools_web_client_id'],\n region: config['aws_cognito_region'],\n identityPoolId: config['aws_cognito_identity_pool_id'],\n mandatorySignIn: config['aws_mandatory_sign_in'] === 'enable' ? true : false\n };\n amplifyConfig.Auth = Auth;\n } // Storage\n\n\n var storageConfig;\n\n if (config['aws_user_files_s3_bucket']) {\n storageConfig = {\n AWSS3: {\n bucket: config['aws_user_files_s3_bucket'],\n region: config['aws_user_files_s3_bucket_region'],\n dangerouslyConnectToHttpEndpointForTesting: config['aws_user_files_s3_dangerously_connect_to_http_endpoint_for_testing']\n }\n };\n } else {\n storageConfig = config ? config.Storage || config : {};\n }\n\n amplifyConfig.Analytics = Object.assign({}, amplifyConfig.Analytics, config.Analytics);\n amplifyConfig.Auth = Object.assign({}, amplifyConfig.Auth, config.Auth);\n amplifyConfig.Storage = Object.assign({}, storageConfig);\n logger.debug('parse config', config, 'to amplifyconfig', amplifyConfig);\n return amplifyConfig;\n };\n\n return Parser;\n}();\n\nexport default Parser;","var __awaiter = this && this.__awaiter || function (thisArg, _arguments, P, generator) {\n function adopt(value) {\n return value instanceof P ? value : new P(function (resolve) {\n resolve(value);\n });\n }\n\n return new (P || (P = Promise))(function (resolve, reject) {\n function fulfilled(value) {\n try {\n step(generator.next(value));\n } catch (e) {\n reject(e);\n }\n }\n\n function rejected(value) {\n try {\n step(generator[\"throw\"](value));\n } catch (e) {\n reject(e);\n }\n }\n\n function step(result) {\n result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected);\n }\n\n step((generator = generator.apply(thisArg, _arguments || [])).next());\n });\n};\n\nvar __generator = this && this.__generator || function (thisArg, body) {\n var _ = {\n label: 0,\n sent: function sent() {\n if (t[0] & 1) throw t[1];\n return t[1];\n },\n trys: [],\n ops: []\n },\n f,\n y,\n t,\n g;\n return g = {\n next: verb(0),\n \"throw\": verb(1),\n \"return\": verb(2)\n }, typeof Symbol === \"function\" && (g[Symbol.iterator] = function () {\n return this;\n }), g;\n\n function verb(n) {\n return function (v) {\n return step([n, v]);\n };\n }\n\n function step(op) {\n if (f) throw new TypeError(\"Generator is already executing.\");\n\n while (_) {\n try {\n if (f = 1, y && (t = op[0] & 2 ? y[\"return\"] : op[0] ? y[\"throw\"] || ((t = y[\"return\"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;\n if (y = 0, t) op = [op[0] & 2, t.value];\n\n switch (op[0]) {\n case 0:\n case 1:\n t = op;\n break;\n\n case 4:\n _.label++;\n return {\n value: op[1],\n done: false\n };\n\n case 5:\n _.label++;\n y = op[1];\n op = [0];\n continue;\n\n case 7:\n op = _.ops.pop();\n\n _.trys.pop();\n\n continue;\n\n default:\n if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) {\n _ = 0;\n continue;\n }\n\n if (op[0] === 3 && (!t || op[1] > t[0] && op[1] < t[3])) {\n _.label = op[1];\n break;\n }\n\n if (op[0] === 6 && _.label < t[1]) {\n _.label = t[1];\n t = op;\n break;\n }\n\n if (t && _.label < t[2]) {\n _.label = t[2];\n\n _.ops.push(op);\n\n break;\n }\n\n if (t[2]) _.ops.pop();\n\n _.trys.pop();\n\n continue;\n }\n\n op = body.call(thisArg, _);\n } catch (e) {\n op = [6, e];\n y = 0;\n } finally {\n f = t = 0;\n }\n }\n\n if (op[0] & 5) throw op[1];\n return {\n value: op[0] ? op[1] : void 0,\n done: true\n };\n }\n};\n/*\n * Copyright 2017-2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\"). You may not use this file except in compliance with\n * the License. A copy of the License is located at\n *\n * http://aws.amazon.com/apache2.0/\n *\n * or in the \"license\" file accompanying this file. This file is distributed on an \"AS IS\" BASIS, WITHOUT WARRANTIES OR\n * CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions\n * and limitations under the License.\n */\n\n\nimport { ConsoleLogger as Logger } from '../Logger';\nimport JS from '../JS';\nvar logger = new Logger('CognitoCredentials');\nvar waitForInit = new Promise(function (res, rej) {\n if (!JS.browserOrNode().isBrowser) {\n logger.debug('not in the browser, directly resolved');\n return res();\n }\n\n var ga = window['gapi'] && window['gapi'].auth2 ? window['gapi'].auth2 : null;\n\n if (ga) {\n logger.debug('google api already loaded');\n return res();\n } else {\n setTimeout(function () {\n return res();\n }, 2000);\n }\n});\n\nvar GoogleOAuth =\n/** @class */\nfunction () {\n function GoogleOAuth() {\n this.initialized = false;\n this.refreshGoogleToken = this.refreshGoogleToken.bind(this);\n this._refreshGoogleTokenImpl = this._refreshGoogleTokenImpl.bind(this);\n }\n\n GoogleOAuth.prototype.refreshGoogleToken = function () {\n return __awaiter(this, void 0, void 0, function () {\n return __generator(this, function (_a) {\n switch (_a.label) {\n case 0:\n if (!!this.initialized) return [3\n /*break*/\n , 2];\n logger.debug('need to wait for the Google SDK loaded');\n return [4\n /*yield*/\n , waitForInit];\n\n case 1:\n _a.sent();\n\n this.initialized = true;\n logger.debug('finish waiting');\n _a.label = 2;\n\n case 2:\n return [2\n /*return*/\n , this._refreshGoogleTokenImpl()];\n }\n });\n });\n };\n\n GoogleOAuth.prototype._refreshGoogleTokenImpl = function () {\n var ga = null;\n if (JS.browserOrNode().isBrowser) ga = window['gapi'] && window['gapi'].auth2 ? window['gapi'].auth2 : null;\n\n if (!ga) {\n logger.debug('no gapi auth2 available');\n return Promise.reject('no gapi auth2 available');\n }\n\n return new Promise(function (res, rej) {\n ga.getAuthInstance().then(function (googleAuth) {\n if (!googleAuth) {\n console.log('google Auth undefiend');\n rej('google Auth undefiend');\n }\n\n var googleUser = googleAuth.currentUser.get(); // refresh the token\n\n if (googleUser.isSignedIn()) {\n logger.debug('refreshing the google access token');\n googleUser.reloadAuthResponse().then(function (authResponse) {\n var id_token = authResponse.id_token,\n expires_at = authResponse.expires_at;\n var profile = googleUser.getBasicProfile();\n var user = {\n email: profile.getEmail(),\n name: profile.getName()\n };\n res({\n token: id_token,\n expires_at: expires_at\n });\n });\n } else {\n rej('User is not signed in with Google');\n }\n }).catch(function (err) {\n logger.debug('Failed to refresh google token', err);\n rej('Failed to refresh google token');\n });\n });\n };\n\n return GoogleOAuth;\n}();\n\nexport default GoogleOAuth;","var __awaiter = this && this.__awaiter || function (thisArg, _arguments, P, generator) {\n function adopt(value) {\n return value instanceof P ? value : new P(function (resolve) {\n resolve(value);\n });\n }\n\n return new (P || (P = Promise))(function (resolve, reject) {\n function fulfilled(value) {\n try {\n step(generator.next(value));\n } catch (e) {\n reject(e);\n }\n }\n\n function rejected(value) {\n try {\n step(generator[\"throw\"](value));\n } catch (e) {\n reject(e);\n }\n }\n\n function step(result) {\n result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected);\n }\n\n step((generator = generator.apply(thisArg, _arguments || [])).next());\n });\n};\n\nvar __generator = this && this.__generator || function (thisArg, body) {\n var _ = {\n label: 0,\n sent: function sent() {\n if (t[0] & 1) throw t[1];\n return t[1];\n },\n trys: [],\n ops: []\n },\n f,\n y,\n t,\n g;\n return g = {\n next: verb(0),\n \"throw\": verb(1),\n \"return\": verb(2)\n }, typeof Symbol === \"function\" && (g[Symbol.iterator] = function () {\n return this;\n }), g;\n\n function verb(n) {\n return function (v) {\n return step([n, v]);\n };\n }\n\n function step(op) {\n if (f) throw new TypeError(\"Generator is already executing.\");\n\n while (_) {\n try {\n if (f = 1, y && (t = op[0] & 2 ? y[\"return\"] : op[0] ? y[\"throw\"] || ((t = y[\"return\"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;\n if (y = 0, t) op = [op[0] & 2, t.value];\n\n switch (op[0]) {\n case 0:\n case 1:\n t = op;\n break;\n\n case 4:\n _.label++;\n return {\n value: op[1],\n done: false\n };\n\n case 5:\n _.label++;\n y = op[1];\n op = [0];\n continue;\n\n case 7:\n op = _.ops.pop();\n\n _.trys.pop();\n\n continue;\n\n default:\n if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) {\n _ = 0;\n continue;\n }\n\n if (op[0] === 3 && (!t || op[1] > t[0] && op[1] < t[3])) {\n _.label = op[1];\n break;\n }\n\n if (op[0] === 6 && _.label < t[1]) {\n _.label = t[1];\n t = op;\n break;\n }\n\n if (t && _.label < t[2]) {\n _.label = t[2];\n\n _.ops.push(op);\n\n break;\n }\n\n if (t[2]) _.ops.pop();\n\n _.trys.pop();\n\n continue;\n }\n\n op = body.call(thisArg, _);\n } catch (e) {\n op = [6, e];\n y = 0;\n } finally {\n f = t = 0;\n }\n }\n\n if (op[0] & 5) throw op[1];\n return {\n value: op[0] ? op[1] : void 0,\n done: true\n };\n }\n};\n/*\n * Copyright 2017-2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\"). You may not use this file except in compliance with\n * the License. A copy of the License is located at\n *\n * http://aws.amazon.com/apache2.0/\n *\n * or in the \"license\" file accompanying this file. This file is distributed on an \"AS IS\" BASIS, WITHOUT WARRANTIES OR\n * CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions\n * and limitations under the License.\n */\n\n\nimport { ConsoleLogger as Logger } from '../Logger';\nimport JS from '../JS';\nvar logger = new Logger('CognitoCredentials');\nvar waitForInit = new Promise(function (res, rej) {\n if (!JS.browserOrNode().isBrowser) {\n logger.debug('not in the browser, directly resolved');\n return res();\n }\n\n var fb = window['FB'];\n\n if (fb) {\n logger.debug('FB SDK already loaded');\n return res();\n } else {\n setTimeout(function () {\n return res();\n }, 2000);\n }\n});\n\nvar FacebookOAuth =\n/** @class */\nfunction () {\n function FacebookOAuth() {\n this.initialized = false;\n this.refreshFacebookToken = this.refreshFacebookToken.bind(this);\n this._refreshFacebookTokenImpl = this._refreshFacebookTokenImpl.bind(this);\n }\n\n FacebookOAuth.prototype.refreshFacebookToken = function () {\n return __awaiter(this, void 0, void 0, function () {\n return __generator(this, function (_a) {\n switch (_a.label) {\n case 0:\n if (!!this.initialized) return [3\n /*break*/\n , 2];\n logger.debug('need to wait for the Facebook SDK loaded');\n return [4\n /*yield*/\n , waitForInit];\n\n case 1:\n _a.sent();\n\n this.initialized = true;\n logger.debug('finish waiting');\n _a.label = 2;\n\n case 2:\n return [2\n /*return*/\n , this._refreshFacebookTokenImpl()];\n }\n });\n });\n };\n\n FacebookOAuth.prototype._refreshFacebookTokenImpl = function () {\n var fb = null;\n if (JS.browserOrNode().isBrowser) fb = window['FB'];\n\n if (!fb) {\n logger.debug('no fb sdk available');\n return Promise.reject('no fb sdk available');\n }\n\n return new Promise(function (res, rej) {\n fb.getLoginStatus(function (fbResponse) {\n if (!fbResponse || !fbResponse.authResponse) {\n logger.debug('no response from facebook when refreshing the jwt token');\n rej('no response from facebook when refreshing the jwt token');\n }\n\n var response = fbResponse.authResponse;\n var accessToken = response.accessToken,\n expiresIn = response.expiresIn;\n var date = new Date();\n var expires_at = expiresIn * 1000 + date.getTime();\n\n if (!accessToken) {\n logger.debug('the jwtToken is undefined');\n rej('the jwtToken is undefined');\n }\n\n res({\n token: accessToken,\n expires_at: expires_at\n });\n }, {\n scope: 'public_profile,email'\n });\n });\n };\n\n return FacebookOAuth;\n}();\n\nexport default FacebookOAuth;","/*\n * Copyright 2017-2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\"). You may not use this file except in compliance with\n * the License. A copy of the License is located at\n *\n * http://aws.amazon.com/apache2.0/\n *\n * or in the \"license\" file accompanying this file. This file is distributed on an \"AS IS\" BASIS, WITHOUT WARRANTIES OR\n * CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions\n * and limitations under the License.\n */\nimport GoogleOAuthClass from './GoogleOAuth';\nimport FacebookOAuthClass from './FacebookOAuth';\nvar GoogleOAuth = new GoogleOAuthClass();\nvar FacebookOAuth = new FacebookOAuthClass();\nexport { GoogleOAuth, FacebookOAuth };","/*\n * Copyright 2017-2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\"). You may not use this file except in compliance with\n * the License. A copy of the License is located at\n *\n * http://aws.amazon.com/apache2.0/\n *\n * or in the \"license\" file accompanying this file. This file is distributed on an \"AS IS\" BASIS, WITHOUT WARRANTIES OR\n * CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions\n * and limitations under the License.\n */\nvar dataMemory = {};\n/** @class */\n\nvar MemoryStorage =\n/** @class */\nfunction () {\n function MemoryStorage() {}\n /**\n * This is used to set a specific item in storage\n * @param {string} key - the key for the item\n * @param {object} value - the value\n * @returns {string} value that was set\n */\n\n\n MemoryStorage.setItem = function (key, value) {\n dataMemory[key] = value;\n return dataMemory[key];\n };\n /**\n * This is used to get a specific key from storage\n * @param {string} key - the key for the item\n * This is used to clear the storage\n * @returns {string} the data item\n */\n\n\n MemoryStorage.getItem = function (key) {\n return Object.prototype.hasOwnProperty.call(dataMemory, key) ? dataMemory[key] : undefined;\n };\n /**\n * This is used to remove an item from storage\n * @param {string} key - the key being set\n * @returns {string} value - value that was deleted\n */\n\n\n MemoryStorage.removeItem = function (key) {\n return delete dataMemory[key];\n };\n /**\n * This is used to clear the storage\n * @returns {string} nothing\n */\n\n\n MemoryStorage.clear = function () {\n dataMemory = {};\n return dataMemory;\n };\n\n return MemoryStorage;\n}();\n\nexport { MemoryStorage };\n\nvar StorageHelper =\n/** @class */\nfunction () {\n /**\n * This is used to get a storage object\n * @returns {object} the storage\n */\n function StorageHelper() {\n try {\n this.storageWindow = window.localStorage;\n this.storageWindow.setItem('aws.amplify.test-ls', 1);\n this.storageWindow.removeItem('aws.amplify.test-ls');\n } catch (exception) {\n this.storageWindow = MemoryStorage;\n }\n }\n /**\n * This is used to return the storage\n * @returns {object} the storage\n */\n\n\n StorageHelper.prototype.getStorage = function () {\n return this.storageWindow;\n };\n\n return StorageHelper;\n}();\n\nexport default StorageHelper;","var __assign = this && this.__assign || function () {\n __assign = Object.assign || function (t) {\n for (var s, i = 1, n = arguments.length; i < n; i++) {\n s = arguments[i];\n\n for (var p in s) {\n if (Object.prototype.hasOwnProperty.call(s, p)) t[p] = s[p];\n }\n }\n\n return t;\n };\n\n return __assign.apply(this, arguments);\n};\n\nvar __awaiter = this && this.__awaiter || function (thisArg, _arguments, P, generator) {\n function adopt(value) {\n return value instanceof P ? value : new P(function (resolve) {\n resolve(value);\n });\n }\n\n return new (P || (P = Promise))(function (resolve, reject) {\n function fulfilled(value) {\n try {\n step(generator.next(value));\n } catch (e) {\n reject(e);\n }\n }\n\n function rejected(value) {\n try {\n step(generator[\"throw\"](value));\n } catch (e) {\n reject(e);\n }\n }\n\n function step(result) {\n result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected);\n }\n\n step((generator = generator.apply(thisArg, _arguments || [])).next());\n });\n};\n\nvar __generator = this && this.__generator || function (thisArg, body) {\n var _ = {\n label: 0,\n sent: function sent() {\n if (t[0] & 1) throw t[1];\n return t[1];\n },\n trys: [],\n ops: []\n },\n f,\n y,\n t,\n g;\n return g = {\n next: verb(0),\n \"throw\": verb(1),\n \"return\": verb(2)\n }, typeof Symbol === \"function\" && (g[Symbol.iterator] = function () {\n return this;\n }), g;\n\n function verb(n) {\n return function (v) {\n return step([n, v]);\n };\n }\n\n function step(op) {\n if (f) throw new TypeError(\"Generator is already executing.\");\n\n while (_) {\n try {\n if (f = 1, y && (t = op[0] & 2 ? y[\"return\"] : op[0] ? y[\"throw\"] || ((t = y[\"return\"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;\n if (y = 0, t) op = [op[0] & 2, t.value];\n\n switch (op[0]) {\n case 0:\n case 1:\n t = op;\n break;\n\n case 4:\n _.label++;\n return {\n value: op[1],\n done: false\n };\n\n case 5:\n _.label++;\n y = op[1];\n op = [0];\n continue;\n\n case 7:\n op = _.ops.pop();\n\n _.trys.pop();\n\n continue;\n\n default:\n if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) {\n _ = 0;\n continue;\n }\n\n if (op[0] === 3 && (!t || op[1] > t[0] && op[1] < t[3])) {\n _.label = op[1];\n break;\n }\n\n if (op[0] === 6 && _.label < t[1]) {\n _.label = t[1];\n t = op;\n break;\n }\n\n if (t && _.label < t[2]) {\n _.label = t[2];\n\n _.ops.push(op);\n\n break;\n }\n\n if (t[2]) _.ops.pop();\n\n _.trys.pop();\n\n continue;\n }\n\n op = body.call(thisArg, _);\n } catch (e) {\n op = [6, e];\n y = 0;\n } finally {\n f = t = 0;\n }\n }\n\n if (op[0] & 5) throw op[1];\n return {\n value: op[0] ? op[1] : void 0,\n done: true\n };\n }\n};\n\nimport { ConsoleLogger as Logger } from './Logger';\nimport StorageHelper from './StorageHelper';\nimport { AWS } from './Facet';\nimport JS from './JS';\nimport { FacebookOAuth, GoogleOAuth } from './OAuthHelper';\nimport Amplify from './Amplify';\nvar logger = new Logger('Credentials');\n\nvar Credentials =\n/** @class */\nfunction () {\n function Credentials(config) {\n this._gettingCredPromise = null;\n this._refreshHandlers = {};\n this.configure(config);\n this._refreshHandlers['google'] = GoogleOAuth.refreshGoogleToken;\n this._refreshHandlers['facebook'] = FacebookOAuth.refreshFacebookToken;\n }\n\n Credentials.prototype.getCredSource = function () {\n return this._credentials_source;\n };\n\n Credentials.prototype.configure = function (config) {\n if (!config) return this._config || {};\n this._config = Object.assign({}, this._config, config);\n var refreshHandlers = this._config.refreshHandlers; // If the developer has provided an object of refresh handlers,\n // then we can merge the provided handlers with the current handlers.\n\n if (refreshHandlers) {\n this._refreshHandlers = __assign(__assign({}, this._refreshHandlers), refreshHandlers);\n }\n\n this._storage = this._config.storage;\n\n if (!this._storage) {\n this._storage = new StorageHelper().getStorage();\n }\n\n this._storageSync = Promise.resolve();\n\n if (typeof this._storage['sync'] === 'function') {\n this._storageSync = this._storage['sync']();\n }\n\n return this._config;\n };\n\n Credentials.prototype.get = function () {\n logger.debug('getting credentials');\n return this._pickupCredentials();\n };\n\n Credentials.prototype._pickupCredentials = function () {\n logger.debug('picking up credentials');\n\n if (!this._gettingCredPromise || !this._gettingCredPromise.isPending()) {\n logger.debug('getting new cred promise');\n\n if (AWS.config && AWS.config.credentials && AWS.config.credentials instanceof AWS.Credentials) {\n this._gettingCredPromise = JS.makeQuerablePromise(this._setCredentialsFromAWS());\n } else {\n this._gettingCredPromise = JS.makeQuerablePromise(this._keepAlive());\n }\n } else {\n logger.debug('getting old cred promise');\n }\n\n return this._gettingCredPromise;\n };\n\n Credentials.prototype._keepAlive = function () {\n logger.debug('checking if credentials exists and not expired');\n var cred = this._credentials;\n\n if (cred && !this._isExpired(cred)) {\n logger.debug('credentials not changed and not expired, directly return');\n return Promise.resolve(cred);\n }\n\n logger.debug('need to get a new credential or refresh the existing one');\n\n if (Amplify.Auth && typeof Amplify.Auth.currentUserCredentials === 'function') {\n return Amplify.Auth.currentUserCredentials();\n } else {\n return Promise.reject('No Auth module registered in Amplify');\n }\n };\n\n Credentials.prototype.refreshFederatedToken = function (federatedInfo) {\n var _this = this;\n\n logger.debug('Getting federated credentials');\n var provider = federatedInfo.provider,\n user = federatedInfo.user;\n var token = federatedInfo.token;\n var expires_at = federatedInfo.expires_at;\n var identity_id = federatedInfo.identity_id;\n var that = this;\n logger.debug('checking if federated jwt token expired');\n\n if (expires_at > new Date().getTime()) {\n // if not expired\n logger.debug('token not expired');\n return this._setCredentialsFromFederation({\n provider: provider,\n token: token,\n user: user,\n identity_id: identity_id,\n expires_at: expires_at\n });\n } else {\n // if refresh handler exists\n if (that._refreshHandlers[provider] && typeof that._refreshHandlers[provider] === 'function') {\n logger.debug('getting refreshed jwt token from federation provider');\n return that._refreshHandlers[provider]().then(function (data) {\n logger.debug('refresh federated token sucessfully', data);\n token = data.token;\n identity_id = data.identity_id;\n expires_at = data.expires_at;\n return that._setCredentialsFromFederation({\n provider: provider,\n token: token,\n user: user,\n identity_id: identity_id,\n expires_at: expires_at\n });\n }).catch(function (e) {\n logger.debug('refresh federated token failed', e);\n\n _this.clear();\n\n return Promise.reject('refreshing federation token failed: ' + e);\n });\n } else {\n logger.debug('no refresh handler for provider:', provider);\n this.clear();\n return Promise.reject('no refresh handler for provider');\n }\n }\n };\n\n Credentials.prototype._isExpired = function (credentials) {\n if (!credentials) {\n logger.debug('no credentials for expiration check');\n return true;\n }\n\n logger.debug('is this credentials expired?', credentials);\n var ts = new Date().getTime();\n var delta = 10 * 60 * 1000; // 10 minutes\n\n var expired = credentials.expired,\n expireTime = credentials.expireTime;\n\n if (!expired && expireTime > ts + delta) {\n return false;\n }\n\n return true;\n };\n\n Credentials.prototype._setCredentialsForGuest = function () {\n return __awaiter(this, void 0, void 0, function () {\n var attempted, _a, identityPoolId, region, mandatorySignIn, identityId, e_1, credentials, that;\n\n var _this = this;\n\n return __generator(this, function (_b) {\n switch (_b.label) {\n case 0:\n attempted = false;\n logger.debug('setting credentials for guest');\n _a = this._config, identityPoolId = _a.identityPoolId, region = _a.region, mandatorySignIn = _a.mandatorySignIn;\n\n if (mandatorySignIn) {\n return [2\n /*return*/\n , Promise.reject('cannot get guest credentials when mandatory signin enabled')];\n }\n\n if (!identityPoolId) {\n logger.debug('No Cognito Federated Identity pool provided');\n return [2\n /*return*/\n , Promise.reject('No Cognito Federated Identity pool provided')];\n }\n\n identityId = undefined;\n _b.label = 1;\n\n case 1:\n _b.trys.push([1, 3,, 4]);\n\n return [4\n /*yield*/\n , this._storageSync];\n\n case 2:\n _b.sent();\n\n identityId = this._storage.getItem('CognitoIdentityId-' + identityPoolId);\n return [3\n /*break*/\n , 4];\n\n case 3:\n e_1 = _b.sent();\n logger.debug('Failed to get the cached identityId', e_1);\n return [3\n /*break*/\n , 4];\n\n case 4:\n credentials = new AWS.CognitoIdentityCredentials({\n IdentityPoolId: identityPoolId,\n IdentityId: identityId ? identityId : undefined\n }, {\n region: region\n });\n that = this;\n return [2\n /*return*/\n , this._loadCredentials(credentials, 'guest', false, null).then(function (res) {\n return res;\n }).catch(function (e) {\n return __awaiter(_this, void 0, void 0, function () {\n var newCredentials;\n return __generator(this, function (_a) {\n // If identity id is deleted in the console, we make one attempt to recreate it\n // and remove existing id from cache.\n if (e.code === 'ResourceNotFoundException' && e.message === \"Identity '\" + identityId + \"' not found.\" && !attempted) {\n attempted = true;\n logger.debug('Failed to load guest credentials');\n\n this._storage.removeItem('CognitoIdentityId-' + identityPoolId);\n\n credentials.clearCachedId();\n newCredentials = new AWS.CognitoIdentityCredentials({\n IdentityPoolId: identityPoolId,\n IdentityId: undefined\n }, {\n region: region\n });\n return [2\n /*return*/\n , this._loadCredentials(newCredentials, 'guest', false, null)];\n } else {\n return [2\n /*return*/\n , e];\n }\n\n return [2\n /*return*/\n ];\n });\n });\n })];\n }\n });\n });\n };\n\n Credentials.prototype._setCredentialsFromAWS = function () {\n var credentials = AWS.config.credentials;\n logger.debug('setting credentials from aws');\n var that = this;\n\n if (credentials instanceof AWS.Credentials) {\n return Promise.resolve(credentials);\n } else {\n logger.debug('AWS.config.credentials is not an instance of AWS Credentials');\n return Promise.reject('AWS.config.credentials is not an instance of AWS Credentials');\n }\n };\n\n Credentials.prototype._setCredentialsFromFederation = function (params) {\n var provider = params.provider,\n token = params.token,\n identity_id = params.identity_id,\n user = params.user,\n expires_at = params.expires_at;\n var domains = {\n google: 'accounts.google.com',\n facebook: 'graph.facebook.com',\n amazon: 'www.amazon.com',\n developer: 'cognito-identity.amazonaws.com'\n }; // Use custom provider url instead of the predefined ones\n\n var domain = domains[provider] || provider;\n\n if (!domain) {\n return Promise.reject('You must specify a federated provider');\n }\n\n var logins = {};\n logins[domain] = token;\n var _a = this._config,\n identityPoolId = _a.identityPoolId,\n region = _a.region;\n\n if (!identityPoolId) {\n logger.debug('No Cognito Federated Identity pool provided');\n return Promise.reject('No Cognito Federated Identity pool provided');\n }\n\n var credentials = new AWS.CognitoIdentityCredentials({\n IdentityPoolId: identityPoolId,\n IdentityId: identity_id,\n Logins: logins\n }, {\n region: region\n });\n return this._loadCredentials(credentials, 'federated', true, params);\n };\n\n Credentials.prototype._setCredentialsFromSession = function (session) {\n logger.debug('set credentials from session');\n var idToken = session.getIdToken().getJwtToken();\n var _a = this._config,\n region = _a.region,\n userPoolId = _a.userPoolId,\n identityPoolId = _a.identityPoolId;\n\n if (!identityPoolId) {\n logger.debug('No Cognito Federated Identity pool provided');\n return Promise.reject('No Cognito Federated Identity pool provided');\n }\n\n var key = 'cognito-idp.' + region + '.amazonaws.com/' + userPoolId;\n var logins = {};\n logins[key] = idToken;\n var credentials = new AWS.CognitoIdentityCredentials({\n IdentityPoolId: identityPoolId,\n Logins: logins\n }, {\n region: region\n });\n return this._loadCredentials(credentials, 'userPool', true, null);\n };\n\n Credentials.prototype._loadCredentials = function (credentials, source, authenticated, info) {\n var _this = this;\n\n var that = this;\n var identityPoolId = this._config.identityPoolId;\n return new Promise(function (res, rej) {\n credentials.get(function (err) {\n return __awaiter(_this, void 0, void 0, function () {\n var user, provider, token, expires_at, identity_id, e_2;\n return __generator(this, function (_a) {\n switch (_a.label) {\n case 0:\n if (err) {\n logger.debug('Failed to load credentials', credentials);\n rej(err);\n return [2\n /*return*/\n ];\n }\n\n logger.debug('Load credentials successfully', credentials);\n that._credentials = credentials;\n that._credentials.authenticated = authenticated;\n that._credentials_source = source;\n if (!(source === 'federated')) return [3\n /*break*/\n , 3];\n user = Object.assign({\n id: this._credentials.identityId\n }, info.user);\n provider = info.provider, token = info.token, expires_at = info.expires_at, identity_id = info.identity_id;\n\n try {\n this._storage.setItem('aws-amplify-federatedInfo', JSON.stringify({\n provider: provider,\n token: token,\n user: user,\n expires_at: expires_at,\n identity_id: identity_id\n }));\n } catch (e) {\n logger.debug('Failed to put federated info into auth storage', e);\n }\n\n if (!(Amplify.Cache && typeof Amplify.Cache.setItem === 'function')) return [3\n /*break*/\n , 2];\n return [4\n /*yield*/\n , Amplify.Cache.setItem('federatedInfo', {\n provider: provider,\n token: token,\n user: user,\n expires_at: expires_at,\n identity_id: identity_id\n }, {\n priority: 1\n })];\n\n case 1:\n _a.sent();\n\n return [3\n /*break*/\n , 3];\n\n case 2:\n logger.debug('No Cache module registered in Amplify');\n _a.label = 3;\n\n case 3:\n if (!(source === 'guest')) return [3\n /*break*/\n , 7];\n _a.label = 4;\n\n case 4:\n _a.trys.push([4, 6,, 7]);\n\n return [4\n /*yield*/\n , this._storageSync];\n\n case 5:\n _a.sent();\n\n this._storage.setItem('CognitoIdentityId-' + identityPoolId, credentials.identityId);\n\n return [3\n /*break*/\n , 7];\n\n case 6:\n e_2 = _a.sent();\n logger.debug('Failed to cache identityId', e_2);\n return [3\n /*break*/\n , 7];\n\n case 7:\n res(that._credentials);\n return [2\n /*return*/\n ];\n }\n });\n });\n });\n });\n };\n\n Credentials.prototype.set = function (params, source) {\n if (source === 'session') {\n return this._setCredentialsFromSession(params);\n } else if (source === 'federation') {\n return this._setCredentialsFromFederation(params);\n } else if (source === 'guest') {\n return this._setCredentialsForGuest();\n } else {\n logger.debug('no source specified for setting credentials');\n return Promise.reject('invalid source');\n }\n };\n\n Credentials.prototype.clear = function () {\n return __awaiter(this, void 0, void 0, function () {\n var _a, identityPoolId, region, credentials;\n\n return __generator(this, function (_b) {\n switch (_b.label) {\n case 0:\n _a = this._config, identityPoolId = _a.identityPoolId, region = _a.region;\n\n if (identityPoolId) {\n credentials = new AWS.CognitoIdentityCredentials({\n IdentityPoolId: identityPoolId\n }, {\n region: region\n });\n credentials.clearCachedId();\n }\n\n this._credentials = null;\n this._credentials_source = null;\n\n this._storage.removeItem('aws-amplify-federatedInfo');\n\n if (!(Amplify.Cache && typeof Amplify.Cache.setItem === 'function')) return [3\n /*break*/\n , 2];\n return [4\n /*yield*/\n , Amplify.Cache.removeItem('federatedInfo')];\n\n case 1:\n _b.sent();\n\n return [3\n /*break*/\n , 3];\n\n case 2:\n logger.debug('No Cache module registered in Amplify');\n _b.label = 3;\n\n case 3:\n return [2\n /*return*/\n ];\n }\n });\n });\n };\n /**\n * Compact version of credentials\n * @param {Object} credentials\n * @return {Object} - Credentials\n */\n\n\n Credentials.prototype.shear = function (credentials) {\n return {\n accessKeyId: credentials.accessKeyId,\n sessionToken: credentials.sessionToken,\n secretAccessKey: credentials.secretAccessKey,\n identityId: credentials.identityId,\n authenticated: credentials.authenticated\n };\n };\n\n return Credentials;\n}();\n\nexport { Credentials };\nvar instance = new Credentials(null);\nexport default instance;","/*\n * Copyright 2017-2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\"). You may not use this file except in compliance with\n * the License. A copy of the License is located at\n *\n * http://aws.amazon.com/apache2.0/\n *\n * or in the \"license\" file accompanying this file. This file is distributed on an \"AS IS\" BASIS, WITHOUT WARRANTIES OR\n * CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions\n * and limitations under the License.\n */\nimport JS from '../JS';\nimport MemoryStorage from '../StorageHelper';\nvar Linking = {};\nvar AppState = {\n addEventListener: function addEventListener(action, handler) {\n return;\n }\n}; // if not in react native, just use local storage\n\nvar AsyncStorage = JS.browserOrNode().isBrowser ? new MemoryStorage().getStorage() : undefined;\nexport { Linking, AppState, AsyncStorage };","/**\n * Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\"). You may not use this file except in compliance with\n * the License. A copy of the License is located at\n *\n * http://aws.amazon.com/apache2.0/\n *\n * or in the \"license\" file accompanying this file. This file is distributed on an \"AS IS\" BASIS, WITHOUT WARRANTIES OR\n * CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions\n * and limitations under the License.\n */\nimport { ConsoleLogger as Logger } from '../Logger';\nimport JS from '../JS';\nimport Amplify from '../Amplify';\n/**\n * Provides a means to registering a service worker in the browser\n * and communicating with it via postMessage events.\n * https://developer.mozilla.org/en-US/docs/Web/API/Service_Worker_API/\n *\n * postMessage events are currently not supported in all browsers. See:\n * https://developer.mozilla.org/en-US/docs/Web/API/Service_Worker_API\n *\n * At the minmum this class will register the service worker and listen\n * and attempt to dispatch messages on state change and record analytics\n * events based on the service worker lifecycle.\n */\n\nvar ServiceWorkerClass =\n/** @class */\nfunction () {\n function ServiceWorkerClass() {\n // The AWS Amplify logger\n this._logger = new Logger('ServiceWorker');\n }\n\n Object.defineProperty(ServiceWorkerClass.prototype, \"serviceWorker\", {\n /**\n * Get the currently active service worker\n */\n get: function get() {\n return this._serviceWorker;\n },\n enumerable: true,\n configurable: true\n });\n /**\n * Register the service-worker.js file in the browser\n * Make sure the service-worker.js is part of the build\n * for example with Angular, modify the angular-cli.json file\n * and add to \"assets\" array \"service-worker.js\"\n * @param {string} - (optional) Service worker file. Defaults to \"/service-worker.js\"\n * @param {string} - (optional) The service worker scope. Defaults to \"/\"\n * - API Doc: https://developer.mozilla.org/en-US/docs/Web/API/ServiceWorkerContainer/register\n * @returns {Promise}\n *\t- resolve(ServiceWorkerRegistration)\n *\t- reject(Error)\n **/\n\n ServiceWorkerClass.prototype.register = function (filePath, scope) {\n var _this = this;\n\n if (filePath === void 0) {\n filePath = '/service-worker.js';\n }\n\n if (scope === void 0) {\n scope = '/';\n }\n\n this._logger.debug(\"registering \" + filePath);\n\n this._logger.debug(\"registering service worker with scope \" + scope);\n\n return new Promise(function (resolve, reject) {\n if (navigator && 'serviceWorker' in navigator) {\n navigator.serviceWorker.register(filePath, {\n scope: scope\n }).then(function (registration) {\n if (registration.installing) {\n _this._serviceWorker = registration.installing;\n } else if (registration.waiting) {\n _this._serviceWorker = registration.waiting;\n } else if (registration.active) {\n _this._serviceWorker = registration.active;\n }\n\n _this._registration = registration;\n\n _this._setupListeners();\n\n _this._logger.debug(\"Service Worker Registration Success: \" + registration);\n\n return resolve(registration);\n }).catch(function (error) {\n _this._logger.debug(\"Service Worker Registration Failed \" + error);\n\n return reject(error);\n });\n } else {\n return reject(new Error('Service Worker not available'));\n }\n });\n };\n /**\n * Enable web push notifications. If not subscribed, a new subscription will\n * be created and registered.\n * \tTest Push Server: https://web-push-codelab.glitch.me/\n * \tPush Server Libraries: https://github.com/web-push-libs/\n * \tAPI Doc: https://developers.google.com/web/fundamentals/codelabs/push-notifications/\n * @param publicKey\n * @returns {Promise}\n * \t- resolve(PushSubscription)\n * - reject(Error)\n */\n\n\n ServiceWorkerClass.prototype.enablePush = function (publicKey) {\n var _this = this;\n\n if (!this._registration) throw new Error('Service Worker not registered');\n this._publicKey = publicKey;\n return new Promise(function (resolve, reject) {\n if (JS.browserOrNode().isBrowser) {\n _this._registration.pushManager.getSubscription().then(function (subscription) {\n if (subscription) {\n _this._subscription = subscription;\n\n _this._logger.debug(\"User is subscribed to push: \" + JSON.stringify(subscription));\n\n resolve(subscription);\n } else {\n _this._logger.debug(\"User is NOT subscribed to push\");\n\n return _this._registration.pushManager.subscribe({\n userVisibleOnly: true,\n applicationServerKey: _this._urlB64ToUint8Array(publicKey)\n }).then(function (subscription) {\n _this._subscription = subscription;\n\n _this._logger.debug(\"User subscribed: \" + JSON.stringify(subscription));\n\n resolve(subscription);\n }).catch(function (error) {\n _this._logger.error(error);\n });\n }\n });\n } else {\n return reject(new Error('Service Worker not available'));\n }\n });\n };\n /**\n * Convert a base64 encoded string to a Uint8 array for the push server key\n * @param base64String\n */\n\n\n ServiceWorkerClass.prototype._urlB64ToUint8Array = function (base64String) {\n var padding = '='.repeat((4 - base64String.length % 4) % 4);\n var base64 = (base64String + padding).replace(/\\-/g, '+').replace(/_/g, '/');\n var rawData = window.atob(base64);\n var outputArray = new Uint8Array(rawData.length);\n\n for (var i = 0; i < rawData.length; ++i) {\n outputArray[i] = rawData.charCodeAt(i);\n }\n\n return outputArray;\n };\n /**\n * Send a message to the service worker. The service worker needs\n * to implement `self.addEventListener('message') to handle the\n * message. This ***currently*** does not work in Safari or IE.\n * @param {object | string} - An arbitrary JSON object or string message to send to the service worker\n *\t- see: https://developer.mozilla.org/en-US/docs/Web/API/Transferable\n * @returns {Promise}\n **/\n\n\n ServiceWorkerClass.prototype.send = function (message) {\n if (this._serviceWorker) {\n this._serviceWorker.postMessage(typeof message === 'object' ? JSON.stringify(message) : message);\n }\n };\n /**\n * Listen for service worker state change and message events\n * https://developer.mozilla.org/en-US/docs/Web/API/ServiceWorker/state\n **/\n\n\n ServiceWorkerClass.prototype._setupListeners = function () {\n var _this = this;\n\n this._serviceWorker.addEventListener('statechange', function (event) {\n var currentState = _this._serviceWorker.state;\n\n _this._logger.debug(\"ServiceWorker statechange: \" + currentState);\n\n if (Amplify.Analytics && typeof Amplify.Analytics.record === 'function') {\n Amplify.Analytics.record({\n name: 'ServiceWorker',\n attributes: {\n state: currentState\n }\n });\n }\n });\n\n this._serviceWorker.addEventListener('message', function (event) {\n _this._logger.debug(\"ServiceWorker message event: \" + event);\n });\n };\n\n return ServiceWorkerClass;\n}();\n\nexport default ServiceWorkerClass;","/*\n * Copyright 2017-2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\"). You may not use this file except in compliance with\n * the License. A copy of the License is located at\n *\n * http://aws.amazon.com/apache2.0/\n *\n * or in the \"license\" file accompanying this file. This file is distributed on an \"AS IS\" BASIS, WITHOUT WARRANTIES OR\n * CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions\n * and limitations under the License.\n */\nvar packageInfo = require('../../package.json');\n\nvar Platform = {\n userAgent: \"aws-amplify/\" + packageInfo.version + \" js\",\n product: '',\n navigator: null,\n isReactNative: false\n};\n\nif (typeof navigator !== 'undefined' && navigator.product) {\n Platform.product = navigator.product || '';\n Platform.navigator = navigator || null;\n\n switch (navigator.product) {\n case 'ReactNative':\n Platform.userAgent = \"aws-amplify/\" + packageInfo.version + \" react-native\";\n Platform.isReactNative = true;\n break;\n\n default:\n Platform.userAgent = \"aws-amplify/\" + packageInfo.version + \" js\";\n Platform.isReactNative = false;\n break;\n }\n}\n\nexport default Platform;","/*\n * Copyright 2017-2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\"). You may not use this file except in compliance with\n * the License. A copy of the License is located at\n *\n * http://aws.amazon.com/apache2.0/\n *\n * or in the \"license\" file accompanying this file. This file is distributed on an \"AS IS\" BASIS, WITHOUT WARRANTIES OR\n * CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions\n * and limitations under the License.\n */\nimport { AWS } from './Facet';\nimport { ConsoleLogger as Logger } from './Logger';\nimport Amplify from './Amplify';\nexport * from './Facet';\nexport { default as ClientDevice } from './ClientDevice';\nexport { ConsoleLogger, ConsoleLogger as Logger } from './Logger';\nexport * from './Errors';\nexport { default as Hub } from './Hub';\nexport { default as I18n } from './I18n';\nexport { default as JS } from './JS';\nexport { default as Signer } from './Signer';\nexport { default as Parser } from './Parser';\nexport { FacebookOAuth, GoogleOAuth } from './OAuthHelper';\nexport * from './RNComponents';\nexport { default as Credentials } from './Credentials';\nexport { default as ServiceWorker } from './ServiceWorker';\nexport { default as StorageHelper, MemoryStorage } from './StorageHelper';\nexport { default as Platform } from './Platform';\nimport Platform from './Platform';\nexport var Constants = {\n userAgent: Platform.userAgent\n};\nexport default Amplify;\nvar logger = new Logger('Core');\n\nif (AWS['util']) {\n AWS['util'].userAgent = function () {\n return Constants.userAgent;\n };\n} else if (AWS.config) {\n AWS.config.update({\n customUserAgent: Constants.userAgent\n });\n} else {\n logger.warn('No AWS.config');\n}","function _extends() {\n module.exports = _extends = Object.assign || function (target) {\n for (var i = 1; i < arguments.length; i++) {\n var source = arguments[i];\n\n for (var key in source) {\n if (Object.prototype.hasOwnProperty.call(source, key)) {\n target[key] = source[key];\n }\n }\n }\n\n return target;\n };\n\n return _extends.apply(this, arguments);\n}\n\nmodule.exports = _extends;","import defineProperty from \"./defineProperty\";\n\nfunction ownKeys(object, enumerableOnly) {\n var keys = Object.keys(object);\n\n if (Object.getOwnPropertySymbols) {\n var symbols = Object.getOwnPropertySymbols(object);\n if (enumerableOnly) symbols = symbols.filter(function (sym) {\n return Object.getOwnPropertyDescriptor(object, sym).enumerable;\n });\n keys.push.apply(keys, symbols);\n }\n\n return keys;\n}\n\nexport default function _objectSpread2(target) {\n for (var i = 1; i < arguments.length; i++) {\n var source = arguments[i] != null ? arguments[i] : {};\n\n if (i % 2) {\n ownKeys(Object(source), true).forEach(function (key) {\n defineProperty(target, key, source[key]);\n });\n } else if (Object.getOwnPropertyDescriptors) {\n Object.defineProperties(target, Object.getOwnPropertyDescriptors(source));\n } else {\n ownKeys(Object(source)).forEach(function (key) {\n Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key));\n });\n }\n }\n\n return target;\n}","function _defineProperty(obj, key, value) {\n if (key in obj) {\n Object.defineProperty(obj, key, {\n value: value,\n enumerable: true,\n configurable: true,\n writable: true\n });\n } else {\n obj[key] = value;\n }\n\n return obj;\n}\n\nmodule.exports = _defineProperty;","export default function _defineProperty(obj, key, value) {\n if (key in obj) {\n Object.defineProperty(obj, key, {\n value: value,\n enumerable: true,\n configurable: true,\n writable: true\n });\n } else {\n obj[key] = value;\n }\n\n return obj;\n}","/*!\n Copyright (c) 2017 Jed Watson.\n Licensed under the MIT License (MIT), see\n http://jedwatson.github.io/classnames\n*/\n\n/* global define */\n(function () {\n 'use strict';\n\n var hasOwn = {}.hasOwnProperty;\n\n function classNames() {\n var classes = [];\n\n for (var i = 0; i < arguments.length; i++) {\n var arg = arguments[i];\n if (!arg) continue;\n var argType = typeof arg;\n\n if (argType === 'string' || argType === 'number') {\n classes.push(arg);\n } else if (Array.isArray(arg) && arg.length) {\n var inner = classNames.apply(null, arg);\n\n if (inner) {\n classes.push(inner);\n }\n } else if (argType === 'object') {\n for (var key in arg) {\n if (hasOwn.call(arg, key) && arg[key]) {\n classes.push(key);\n }\n }\n }\n }\n\n return classes.join(' ');\n }\n\n if (typeof module !== 'undefined' && module.exports) {\n classNames.default = classNames;\n module.exports = classNames;\n } else if (typeof define === 'function' && typeof define.amd === 'object' && define.amd) {\n // register as 'classnames', consistent with npm package name\n define('classnames', [], function () {\n return classNames;\n });\n } else {\n window.classNames = classNames;\n }\n})();","/*!\n Copyright (c) 2017 Jed Watson.\n Licensed under the MIT License (MIT), see\n http://jedwatson.github.io/classnames\n*/\n\n/* global define */\n(function () {\n 'use strict';\n\n var hasOwn = {}.hasOwnProperty;\n\n function classNames() {\n var classes = [];\n\n for (var i = 0; i < arguments.length; i++) {\n var arg = arguments[i];\n if (!arg) continue;\n var argType = typeof arg;\n\n if (argType === 'string' || argType === 'number') {\n classes.push(arg);\n } else if (Array.isArray(arg) && arg.length) {\n var inner = classNames.apply(null, arg);\n\n if (inner) {\n classes.push(inner);\n }\n } else if (argType === 'object') {\n for (var key in arg) {\n if (hasOwn.call(arg, key) && arg[key]) {\n classes.push(key);\n }\n }\n }\n }\n\n return classes.join(' ');\n }\n\n if (typeof module !== 'undefined' && module.exports) {\n classNames.default = classNames;\n module.exports = classNames;\n } else if (typeof define === 'function' && typeof define.amd === 'object' && define.amd) {\n // register as 'classnames', consistent with npm package name\n define('classnames', [], function () {\n return classNames;\n });\n } else {\n window.classNames = classNames;\n }\n})();","import arrayWithHoles from \"./arrayWithHoles\";\nimport iterableToArrayLimit from \"./iterableToArrayLimit\";\nimport unsupportedIterableToArray from \"./unsupportedIterableToArray\";\nimport nonIterableRest from \"./nonIterableRest\";\nexport default function _slicedToArray(arr, i) {\n return arrayWithHoles(arr) || iterableToArrayLimit(arr, i) || unsupportedIterableToArray(arr, i) || nonIterableRest();\n}","export default function _iterableToArrayLimit(arr, i) {\n if (typeof Symbol === \"undefined\" || !(Symbol.iterator in Object(arr))) return;\n var _arr = [];\n var _n = true;\n var _d = false;\n var _e = undefined;\n\n try {\n for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) {\n _arr.push(_s.value);\n\n if (i && _arr.length === i) break;\n }\n } catch (err) {\n _d = true;\n _e = err;\n } finally {\n try {\n if (!_n && _i[\"return\"] != null) _i[\"return\"]();\n } finally {\n if (_d) throw _e;\n }\n }\n\n return _arr;\n}","var global = require('../internals/global');\n\nvar getOwnPropertyDescriptor = require('../internals/object-get-own-property-descriptor').f;\n\nvar createNonEnumerableProperty = require('../internals/create-non-enumerable-property');\n\nvar redefine = require('../internals/redefine');\n\nvar setGlobal = require('../internals/set-global');\n\nvar copyConstructorProperties = require('../internals/copy-constructor-properties');\n\nvar isForced = require('../internals/is-forced');\n/*\n options.target - name of the target object\n options.global - target is the global object\n options.stat - export as static methods of target\n options.proto - export as prototype methods of target\n options.real - real prototype method for the `pure` version\n options.forced - export even if the native feature is available\n options.bind - bind methods to the target, required for the `pure` version\n options.wrap - wrap constructors to preventing global pollution, required for the `pure` version\n options.unsafe - use the simple assignment of property instead of delete + defineProperty\n options.sham - add a flag to not completely full polyfills\n options.enumerable - export as enumerable property\n options.noTargetGet - prevent calling a getter on target\n*/\n\n\nmodule.exports = function (options, source) {\n var TARGET = options.target;\n var GLOBAL = options.global;\n var STATIC = options.stat;\n var FORCED, target, key, targetProperty, sourceProperty, descriptor;\n\n if (GLOBAL) {\n target = global;\n } else if (STATIC) {\n target = global[TARGET] || setGlobal(TARGET, {});\n } else {\n target = (global[TARGET] || {}).prototype;\n }\n\n if (target) for (key in source) {\n sourceProperty = source[key];\n\n if (options.noTargetGet) {\n descriptor = getOwnPropertyDescriptor(target, key);\n targetProperty = descriptor && descriptor.value;\n } else targetProperty = target[key];\n\n FORCED = isForced(GLOBAL ? key : TARGET + (STATIC ? '.' : '#') + key, options.forced); // contained in target\n\n if (!FORCED && targetProperty !== undefined) {\n if (typeof sourceProperty === typeof targetProperty) continue;\n copyConstructorProperties(sourceProperty, targetProperty);\n } // add a flag to not completely full polyfills\n\n\n if (options.sham || targetProperty && targetProperty.sham) {\n createNonEnumerableProperty(sourceProperty, 'sham', true);\n } // extend global\n\n\n redefine(target, key, sourceProperty, options);\n }\n};","/**\n * The main AWS namespace\n */\nvar AWS = {\n util: require('./util')\n};\n/**\n * @api private\n * @!macro [new] nobrowser\n * @note This feature is not supported in the browser environment of the SDK.\n */\n\nvar _hidden = {};\n\n_hidden.toString(); // hack to parse macro\n\n/**\n * @api private\n */\n\n\nmodule.exports = AWS;\nAWS.util.update(AWS, {\n /**\n * @constant\n */\n VERSION: '2.518.0',\n\n /**\n * @api private\n */\n Signers: {},\n\n /**\n * @api private\n */\n Protocol: {\n Json: require('./protocol/json'),\n Query: require('./protocol/query'),\n Rest: require('./protocol/rest'),\n RestJson: require('./protocol/rest_json'),\n RestXml: require('./protocol/rest_xml')\n },\n\n /**\n * @api private\n */\n XML: {\n Builder: require('./xml/builder'),\n Parser: null // conditionally set based on environment\n\n },\n\n /**\n * @api private\n */\n JSON: {\n Builder: require('./json/builder'),\n Parser: require('./json/parser')\n },\n\n /**\n * @api private\n */\n Model: {\n Api: require('./model/api'),\n Operation: require('./model/operation'),\n Shape: require('./model/shape'),\n Paginator: require('./model/paginator'),\n ResourceWaiter: require('./model/resource_waiter')\n },\n\n /**\n * @api private\n */\n apiLoader: require('./api_loader'),\n\n /**\n * @api private\n */\n EndpointCache: require('../vendor/endpoint-cache').EndpointCache\n});\n\nrequire('./sequential_executor');\n\nrequire('./service');\n\nrequire('./config');\n\nrequire('./http');\n\nrequire('./event_listeners');\n\nrequire('./request');\n\nrequire('./response');\n\nrequire('./resource_waiter');\n\nrequire('./signers/request_signer');\n\nrequire('./param_validator');\n/**\n * @readonly\n * @return [AWS.SequentialExecutor] a collection of global event listeners that\n * are attached to every sent request.\n * @see AWS.Request AWS.Request for a list of events to listen for\n * @example Logging the time taken to send a request\n * AWS.events.on('send', function startSend(resp) {\n * resp.startTime = new Date().getTime();\n * }).on('complete', function calculateTime(resp) {\n * var time = (new Date().getTime() - resp.startTime) / 1000;\n * console.log('Request took ' + time + ' seconds');\n * });\n *\n * new AWS.S3().listBuckets(); // prints 'Request took 0.285 seconds'\n */\n\n\nAWS.events = new AWS.SequentialExecutor(); //create endpoint cache lazily\n\nAWS.util.memoizedProperty(AWS, 'endpointCache', function () {\n return new AWS.EndpointCache(AWS.config.endpointCacheSize);\n}, true);","/*\n * Copyright 2017-2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\"). You may not use this file except in compliance with\n * the License. A copy of the License is located at\n *\n * http://aws.amazon.com/apache2.0/\n *\n * or in the \"license\" file accompanying this file. This file is distributed on an \"AS IS\" BASIS, WITHOUT WARRANTIES OR\n * CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions\n * and limitations under the License.\n */\nexport var CognitoHostedUIIdentityProvider;\n\n(function (CognitoHostedUIIdentityProvider) {\n CognitoHostedUIIdentityProvider[\"Cognito\"] = \"COGNITO\";\n CognitoHostedUIIdentityProvider[\"Google\"] = \"Google\";\n CognitoHostedUIIdentityProvider[\"Facebook\"] = \"Facebook\";\n CognitoHostedUIIdentityProvider[\"Amazon\"] = \"LoginWithAmazon\";\n})(CognitoHostedUIIdentityProvider || (CognitoHostedUIIdentityProvider = {}));\n\nexport function isFederatedSignInOptions(obj) {\n var keys = ['provider', 'customState'];\n return obj && !!keys.find(function (k) {\n return obj.hasOwnProperty(k);\n });\n}\nexport function isFederatedSignInOptionsCustom(obj) {\n var keys = ['customProvider', 'customState'];\n return obj && !!keys.find(function (k) {\n return obj.hasOwnProperty(k);\n });\n}\nexport function isCognitoHostedOpts(oauth) {\n return oauth.redirectSignIn !== undefined;\n}\nexport var AuthErrorTypes;\n\n(function (AuthErrorTypes) {\n AuthErrorTypes[\"NoConfig\"] = \"noConfig\";\n AuthErrorTypes[\"MissingAuthConfig\"] = \"missingAuthConfig\";\n AuthErrorTypes[\"EmptyUsername\"] = \"emptyUsername\";\n AuthErrorTypes[\"InvalidUsername\"] = \"invalidUsername\";\n AuthErrorTypes[\"EmptyPassword\"] = \"emptyPassword\";\n AuthErrorTypes[\"EmptyCode\"] = \"emptyCode\";\n AuthErrorTypes[\"SignUpError\"] = \"signUpError\";\n AuthErrorTypes[\"NoMFA\"] = \"noMFA\";\n AuthErrorTypes[\"InvalidMFA\"] = \"invalidMFA\";\n AuthErrorTypes[\"EmptyChallengeResponse\"] = \"emptyChallengeResponse\";\n AuthErrorTypes[\"NoUserSession\"] = \"noUserSession\";\n AuthErrorTypes[\"Default\"] = \"default\";\n})(AuthErrorTypes || (AuthErrorTypes = {}));\n\nexport function isUsernamePasswordOpts(obj) {\n return !!obj.username;\n}","function _classCallCheck(instance, Constructor) {\n if (!(instance instanceof Constructor)) {\n throw new TypeError(\"Cannot call a class as a function\");\n }\n}\n/*!\n * Copyright 2016 Amazon.com,\n * Inc. or its affiliates. All Rights Reserved.\n *\n * Licensed under the Amazon Software License (the \"License\").\n * You may not use this file except in compliance with the\n * License. A copy of the License is located at\n *\n * http://aws.amazon.com/asl/\n *\n * or in the \"license\" file accompanying this file. This file is\n * distributed on an \"AS IS\" BASIS, WITHOUT WARRANTIES OR\n * CONDITIONS OF ANY KIND, express or implied. See the License\n * for the specific language governing permissions and\n * limitations under the License.\n */\n\n/** @class */\n\n\nvar AuthenticationDetails = function () {\n /**\n * Constructs a new AuthenticationDetails object\n * @param {object=} data Creation options.\n * @param {string} data.Username User being authenticated.\n * @param {string} data.Password Plain-text password to authenticate with.\n * @param {(AttributeArg[])?} data.ValidationData Application extra metadata.\n * @param {(AttributeArg[])?} data.AuthParamaters Authentication paramaters for custom auth.\n */\n function AuthenticationDetails(data) {\n _classCallCheck(this, AuthenticationDetails);\n\n var _ref = data || {},\n ValidationData = _ref.ValidationData,\n Username = _ref.Username,\n Password = _ref.Password,\n AuthParameters = _ref.AuthParameters,\n ClientMetadata = _ref.ClientMetadata;\n\n this.validationData = ValidationData || {};\n this.authParameters = AuthParameters || {};\n this.clientMetadata = ClientMetadata || {};\n this.username = Username;\n this.password = Password;\n }\n /**\n * @returns {string} the record's username\n */\n\n\n AuthenticationDetails.prototype.getUsername = function getUsername() {\n return this.username;\n };\n /**\n * @returns {string} the record's password\n */\n\n\n AuthenticationDetails.prototype.getPassword = function getPassword() {\n return this.password;\n };\n /**\n * @returns {Array} the record's validationData\n */\n\n\n AuthenticationDetails.prototype.getValidationData = function getValidationData() {\n return this.validationData;\n };\n /**\n * @returns {Array} the record's authParameters\n */\n\n\n AuthenticationDetails.prototype.getAuthParameters = function getAuthParameters() {\n return this.authParameters;\n };\n /**\n * @returns {ClientMetadata} the clientMetadata for a Lambda trigger\n */\n\n\n AuthenticationDetails.prototype.getClientMetadata = function getClientMetadata() {\n return this.clientMetadata;\n };\n\n return AuthenticationDetails;\n}();\n\nexport default AuthenticationDetails;","// A small implementation of BigInteger based on http://www-cs-students.stanford.edu/~tjw/jsbn/\n//\n// All public methods have been removed except the following:\n// new BigInteger(a, b) (only radix 2, 4, 8, 16 and 32 supported)\n// toString (only radix 2, 4, 8, 16 and 32 supported)\n// negate\n// abs\n// compareTo\n// bitLength\n// mod\n// equals\n// add\n// subtract\n// multiply\n// divide\n// modPow\nexport default BigInteger;\n/*\n * Copyright (c) 2003-2005 Tom Wu\n * All Rights Reserved.\n *\n * Permission is hereby granted, free of charge, to any person obtaining\n * a copy of this software and associated documentation files (the\n * \"Software\"), to deal in the Software without restriction, including\n * without limitation the rights to use, copy, modify, merge, publish,\n * distribute, sublicense, and/or sell copies of the Software, and to\n * permit persons to whom the Software is furnished to do so, subject to\n * the following conditions:\n *\n * The above copyright notice and this permission notice shall be\n * included in all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS-IS\" AND WITHOUT WARRANTY OF ANY KIND,\n * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY\n * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.\n *\n * IN NO EVENT SHALL TOM WU BE LIABLE FOR ANY SPECIAL, INCIDENTAL,\n * INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND, OR ANY DAMAGES WHATSOEVER\n * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER OR NOT ADVISED OF\n * THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF LIABILITY, ARISING OUT\n * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.\n *\n * In addition, the following condition applies:\n *\n * All redistributions must retain an intact copy of this copyright notice\n * and disclaimer.\n */\n// (public) Constructor\n\nfunction BigInteger(a, b) {\n if (a != null) this.fromString(a, b);\n} // return new, unset BigInteger\n\n\nfunction nbi() {\n return new BigInteger(null);\n} // Bits per digit\n\n\nvar dbits; // JavaScript engine analysis\n\nvar canary = 0xdeadbeefcafe;\nvar j_lm = (canary & 0xffffff) == 0xefcafe; // am: Compute w_j += (x*this_i), propagate carries,\n// c is initial carry, returns final carry.\n// c < 3*dvalue, x < 2*dvalue, this_i < dvalue\n// We need to select the fastest one that works in this environment.\n// am1: use a single mult and divide to get the high bits,\n// max digit bits should be 26 because\n// max internal value = 2*dvalue^2-2*dvalue (< 2^53)\n\nfunction am1(i, x, w, j, c, n) {\n while (--n >= 0) {\n var v = x * this[i++] + w[j] + c;\n c = Math.floor(v / 0x4000000);\n w[j++] = v & 0x3ffffff;\n }\n\n return c;\n} // am2 avoids a big mult-and-extract completely.\n// Max digit bits should be <= 30 because we do bitwise ops\n// on values up to 2*hdvalue^2-hdvalue-1 (< 2^31)\n\n\nfunction am2(i, x, w, j, c, n) {\n var xl = x & 0x7fff,\n xh = x >> 15;\n\n while (--n >= 0) {\n var l = this[i] & 0x7fff;\n var h = this[i++] >> 15;\n var m = xh * l + h * xl;\n l = xl * l + ((m & 0x7fff) << 15) + w[j] + (c & 0x3fffffff);\n c = (l >>> 30) + (m >>> 15) + xh * h + (c >>> 30);\n w[j++] = l & 0x3fffffff;\n }\n\n return c;\n} // Alternately, set max digit bits to 28 since some\n// browsers slow down when dealing with 32-bit numbers.\n\n\nfunction am3(i, x, w, j, c, n) {\n var xl = x & 0x3fff,\n xh = x >> 14;\n\n while (--n >= 0) {\n var l = this[i] & 0x3fff;\n var h = this[i++] >> 14;\n var m = xh * l + h * xl;\n l = xl * l + ((m & 0x3fff) << 14) + w[j] + c;\n c = (l >> 28) + (m >> 14) + xh * h;\n w[j++] = l & 0xfffffff;\n }\n\n return c;\n}\n\nvar inBrowser = typeof navigator !== 'undefined';\n\nif (inBrowser && j_lm && navigator.appName == 'Microsoft Internet Explorer') {\n BigInteger.prototype.am = am2;\n dbits = 30;\n} else if (inBrowser && j_lm && navigator.appName != 'Netscape') {\n BigInteger.prototype.am = am1;\n dbits = 26;\n} else {\n // Mozilla/Netscape seems to prefer am3\n BigInteger.prototype.am = am3;\n dbits = 28;\n}\n\nBigInteger.prototype.DB = dbits;\nBigInteger.prototype.DM = (1 << dbits) - 1;\nBigInteger.prototype.DV = 1 << dbits;\nvar BI_FP = 52;\nBigInteger.prototype.FV = Math.pow(2, BI_FP);\nBigInteger.prototype.F1 = BI_FP - dbits;\nBigInteger.prototype.F2 = 2 * dbits - BI_FP; // Digit conversions\n\nvar BI_RM = '0123456789abcdefghijklmnopqrstuvwxyz';\nvar BI_RC = new Array();\nvar rr, vv;\nrr = '0'.charCodeAt(0);\n\nfor (vv = 0; vv <= 9; ++vv) {\n BI_RC[rr++] = vv;\n}\n\nrr = 'a'.charCodeAt(0);\n\nfor (vv = 10; vv < 36; ++vv) {\n BI_RC[rr++] = vv;\n}\n\nrr = 'A'.charCodeAt(0);\n\nfor (vv = 10; vv < 36; ++vv) {\n BI_RC[rr++] = vv;\n}\n\nfunction int2char(n) {\n return BI_RM.charAt(n);\n}\n\nfunction intAt(s, i) {\n var c = BI_RC[s.charCodeAt(i)];\n return c == null ? -1 : c;\n} // (protected) copy this to r\n\n\nfunction bnpCopyTo(r) {\n for (var i = this.t - 1; i >= 0; --i) {\n r[i] = this[i];\n }\n\n r.t = this.t;\n r.s = this.s;\n} // (protected) set from integer value x, -DV <= x < DV\n\n\nfunction bnpFromInt(x) {\n this.t = 1;\n this.s = x < 0 ? -1 : 0;\n if (x > 0) this[0] = x;else if (x < -1) this[0] = x + this.DV;else this.t = 0;\n} // return bigint initialized to value\n\n\nfunction nbv(i) {\n var r = nbi();\n r.fromInt(i);\n return r;\n} // (protected) set from string and radix\n\n\nfunction bnpFromString(s, b) {\n var k;\n if (b == 16) k = 4;else if (b == 8) k = 3;else if (b == 2) k = 1;else if (b == 32) k = 5;else if (b == 4) k = 2;else throw new Error('Only radix 2, 4, 8, 16, 32 are supported');\n this.t = 0;\n this.s = 0;\n var i = s.length,\n mi = false,\n sh = 0;\n\n while (--i >= 0) {\n var x = intAt(s, i);\n\n if (x < 0) {\n if (s.charAt(i) == '-') mi = true;\n continue;\n }\n\n mi = false;\n if (sh == 0) this[this.t++] = x;else if (sh + k > this.DB) {\n this[this.t - 1] |= (x & (1 << this.DB - sh) - 1) << sh;\n this[this.t++] = x >> this.DB - sh;\n } else this[this.t - 1] |= x << sh;\n sh += k;\n if (sh >= this.DB) sh -= this.DB;\n }\n\n this.clamp();\n if (mi) BigInteger.ZERO.subTo(this, this);\n} // (protected) clamp off excess high words\n\n\nfunction bnpClamp() {\n var c = this.s & this.DM;\n\n while (this.t > 0 && this[this.t - 1] == c) {\n --this.t;\n }\n} // (public) return string representation in given radix\n\n\nfunction bnToString(b) {\n if (this.s < 0) return '-' + this.negate().toString();\n var k;\n if (b == 16) k = 4;else if (b == 8) k = 3;else if (b == 2) k = 1;else if (b == 32) k = 5;else if (b == 4) k = 2;else throw new Error('Only radix 2, 4, 8, 16, 32 are supported');\n var km = (1 << k) - 1,\n d,\n m = false,\n r = '',\n i = this.t;\n var p = this.DB - i * this.DB % k;\n\n if (i-- > 0) {\n if (p < this.DB && (d = this[i] >> p) > 0) {\n m = true;\n r = int2char(d);\n }\n\n while (i >= 0) {\n if (p < k) {\n d = (this[i] & (1 << p) - 1) << k - p;\n d |= this[--i] >> (p += this.DB - k);\n } else {\n d = this[i] >> (p -= k) & km;\n\n if (p <= 0) {\n p += this.DB;\n --i;\n }\n }\n\n if (d > 0) m = true;\n if (m) r += int2char(d);\n }\n }\n\n return m ? r : '0';\n} // (public) -this\n\n\nfunction bnNegate() {\n var r = nbi();\n BigInteger.ZERO.subTo(this, r);\n return r;\n} // (public) |this|\n\n\nfunction bnAbs() {\n return this.s < 0 ? this.negate() : this;\n} // (public) return + if this > a, - if this < a, 0 if equal\n\n\nfunction bnCompareTo(a) {\n var r = this.s - a.s;\n if (r != 0) return r;\n var i = this.t;\n r = i - a.t;\n if (r != 0) return this.s < 0 ? -r : r;\n\n while (--i >= 0) {\n if ((r = this[i] - a[i]) != 0) return r;\n }\n\n return 0;\n} // returns bit length of the integer x\n\n\nfunction nbits(x) {\n var r = 1,\n t;\n\n if ((t = x >>> 16) != 0) {\n x = t;\n r += 16;\n }\n\n if ((t = x >> 8) != 0) {\n x = t;\n r += 8;\n }\n\n if ((t = x >> 4) != 0) {\n x = t;\n r += 4;\n }\n\n if ((t = x >> 2) != 0) {\n x = t;\n r += 2;\n }\n\n if ((t = x >> 1) != 0) {\n x = t;\n r += 1;\n }\n\n return r;\n} // (public) return the number of bits in \"this\"\n\n\nfunction bnBitLength() {\n if (this.t <= 0) return 0;\n return this.DB * (this.t - 1) + nbits(this[this.t - 1] ^ this.s & this.DM);\n} // (protected) r = this << n*DB\n\n\nfunction bnpDLShiftTo(n, r) {\n var i;\n\n for (i = this.t - 1; i >= 0; --i) {\n r[i + n] = this[i];\n }\n\n for (i = n - 1; i >= 0; --i) {\n r[i] = 0;\n }\n\n r.t = this.t + n;\n r.s = this.s;\n} // (protected) r = this >> n*DB\n\n\nfunction bnpDRShiftTo(n, r) {\n for (var i = n; i < this.t; ++i) {\n r[i - n] = this[i];\n }\n\n r.t = Math.max(this.t - n, 0);\n r.s = this.s;\n} // (protected) r = this << n\n\n\nfunction bnpLShiftTo(n, r) {\n var bs = n % this.DB;\n var cbs = this.DB - bs;\n var bm = (1 << cbs) - 1;\n var ds = Math.floor(n / this.DB),\n c = this.s << bs & this.DM,\n i;\n\n for (i = this.t - 1; i >= 0; --i) {\n r[i + ds + 1] = this[i] >> cbs | c;\n c = (this[i] & bm) << bs;\n }\n\n for (i = ds - 1; i >= 0; --i) {\n r[i] = 0;\n }\n\n r[ds] = c;\n r.t = this.t + ds + 1;\n r.s = this.s;\n r.clamp();\n} // (protected) r = this >> n\n\n\nfunction bnpRShiftTo(n, r) {\n r.s = this.s;\n var ds = Math.floor(n / this.DB);\n\n if (ds >= this.t) {\n r.t = 0;\n return;\n }\n\n var bs = n % this.DB;\n var cbs = this.DB - bs;\n var bm = (1 << bs) - 1;\n r[0] = this[ds] >> bs;\n\n for (var i = ds + 1; i < this.t; ++i) {\n r[i - ds - 1] |= (this[i] & bm) << cbs;\n r[i - ds] = this[i] >> bs;\n }\n\n if (bs > 0) r[this.t - ds - 1] |= (this.s & bm) << cbs;\n r.t = this.t - ds;\n r.clamp();\n} // (protected) r = this - a\n\n\nfunction bnpSubTo(a, r) {\n var i = 0,\n c = 0,\n m = Math.min(a.t, this.t);\n\n while (i < m) {\n c += this[i] - a[i];\n r[i++] = c & this.DM;\n c >>= this.DB;\n }\n\n if (a.t < this.t) {\n c -= a.s;\n\n while (i < this.t) {\n c += this[i];\n r[i++] = c & this.DM;\n c >>= this.DB;\n }\n\n c += this.s;\n } else {\n c += this.s;\n\n while (i < a.t) {\n c -= a[i];\n r[i++] = c & this.DM;\n c >>= this.DB;\n }\n\n c -= a.s;\n }\n\n r.s = c < 0 ? -1 : 0;\n if (c < -1) r[i++] = this.DV + c;else if (c > 0) r[i++] = c;\n r.t = i;\n r.clamp();\n} // (protected) r = this * a, r != this,a (HAC 14.12)\n// \"this\" should be the larger one if appropriate.\n\n\nfunction bnpMultiplyTo(a, r) {\n var x = this.abs(),\n y = a.abs();\n var i = x.t;\n r.t = i + y.t;\n\n while (--i >= 0) {\n r[i] = 0;\n }\n\n for (i = 0; i < y.t; ++i) {\n r[i + x.t] = x.am(0, y[i], r, i, 0, x.t);\n }\n\n r.s = 0;\n r.clamp();\n if (this.s != a.s) BigInteger.ZERO.subTo(r, r);\n} // (protected) r = this^2, r != this (HAC 14.16)\n\n\nfunction bnpSquareTo(r) {\n var x = this.abs();\n var i = r.t = 2 * x.t;\n\n while (--i >= 0) {\n r[i] = 0;\n }\n\n for (i = 0; i < x.t - 1; ++i) {\n var c = x.am(i, x[i], r, 2 * i, 0, 1);\n\n if ((r[i + x.t] += x.am(i + 1, 2 * x[i], r, 2 * i + 1, c, x.t - i - 1)) >= x.DV) {\n r[i + x.t] -= x.DV;\n r[i + x.t + 1] = 1;\n }\n }\n\n if (r.t > 0) r[r.t - 1] += x.am(i, x[i], r, 2 * i, 0, 1);\n r.s = 0;\n r.clamp();\n} // (protected) divide this by m, quotient and remainder to q, r (HAC 14.20)\n// r != q, this != m. q or r may be null.\n\n\nfunction bnpDivRemTo(m, q, r) {\n var pm = m.abs();\n if (pm.t <= 0) return;\n var pt = this.abs();\n\n if (pt.t < pm.t) {\n if (q != null) q.fromInt(0);\n if (r != null) this.copyTo(r);\n return;\n }\n\n if (r == null) r = nbi();\n var y = nbi(),\n ts = this.s,\n ms = m.s;\n var nsh = this.DB - nbits(pm[pm.t - 1]); // normalize modulus\n\n if (nsh > 0) {\n pm.lShiftTo(nsh, y);\n pt.lShiftTo(nsh, r);\n } else {\n pm.copyTo(y);\n pt.copyTo(r);\n }\n\n var ys = y.t;\n var y0 = y[ys - 1];\n if (y0 == 0) return;\n var yt = y0 * (1 << this.F1) + (ys > 1 ? y[ys - 2] >> this.F2 : 0);\n var d1 = this.FV / yt,\n d2 = (1 << this.F1) / yt,\n e = 1 << this.F2;\n var i = r.t,\n j = i - ys,\n t = q == null ? nbi() : q;\n y.dlShiftTo(j, t);\n\n if (r.compareTo(t) >= 0) {\n r[r.t++] = 1;\n r.subTo(t, r);\n }\n\n BigInteger.ONE.dlShiftTo(ys, t);\n t.subTo(y, y); // \"negative\" y so we can replace sub with am later\n\n while (y.t < ys) {\n y[y.t++] = 0;\n }\n\n while (--j >= 0) {\n // Estimate quotient digit\n var qd = r[--i] == y0 ? this.DM : Math.floor(r[i] * d1 + (r[i - 1] + e) * d2);\n\n if ((r[i] += y.am(0, qd, r, j, 0, ys)) < qd) {\n // Try it out\n y.dlShiftTo(j, t);\n r.subTo(t, r);\n\n while (r[i] < --qd) {\n r.subTo(t, r);\n }\n }\n }\n\n if (q != null) {\n r.drShiftTo(ys, q);\n if (ts != ms) BigInteger.ZERO.subTo(q, q);\n }\n\n r.t = ys;\n r.clamp();\n if (nsh > 0) r.rShiftTo(nsh, r); // Denormalize remainder\n\n if (ts < 0) BigInteger.ZERO.subTo(r, r);\n} // (public) this mod a\n\n\nfunction bnMod(a) {\n var r = nbi();\n this.abs().divRemTo(a, null, r);\n if (this.s < 0 && r.compareTo(BigInteger.ZERO) > 0) a.subTo(r, r);\n return r;\n} // (protected) return \"-1/this % 2^DB\"; useful for Mont. reduction\n// justification:\n// xy == 1 (mod m)\n// xy = 1+km\n// xy(2-xy) = (1+km)(1-km)\n// x[y(2-xy)] = 1-k^2m^2\n// x[y(2-xy)] == 1 (mod m^2)\n// if y is 1/x mod m, then y(2-xy) is 1/x mod m^2\n// should reduce x and y(2-xy) by m^2 at each step to keep size bounded.\n// JS multiply \"overflows\" differently from C/C++, so care is needed here.\n\n\nfunction bnpInvDigit() {\n if (this.t < 1) return 0;\n var x = this[0];\n if ((x & 1) == 0) return 0;\n var y = x & 3; // y == 1/x mod 2^2\n\n y = y * (2 - (x & 0xf) * y) & 0xf; // y == 1/x mod 2^4\n\n y = y * (2 - (x & 0xff) * y) & 0xff; // y == 1/x mod 2^8\n\n y = y * (2 - ((x & 0xffff) * y & 0xffff)) & 0xffff; // y == 1/x mod 2^16\n // last step - calculate inverse mod DV directly;\n // assumes 16 < DB <= 32 and assumes ability to handle 48-bit ints\n\n y = y * (2 - x * y % this.DV) % this.DV; // y == 1/x mod 2^dbits\n // we really want the negative inverse, and -DV < y < DV\n\n return y > 0 ? this.DV - y : -y;\n}\n\nfunction bnEquals(a) {\n return this.compareTo(a) == 0;\n} // (protected) r = this + a\n\n\nfunction bnpAddTo(a, r) {\n var i = 0,\n c = 0,\n m = Math.min(a.t, this.t);\n\n while (i < m) {\n c += this[i] + a[i];\n r[i++] = c & this.DM;\n c >>= this.DB;\n }\n\n if (a.t < this.t) {\n c += a.s;\n\n while (i < this.t) {\n c += this[i];\n r[i++] = c & this.DM;\n c >>= this.DB;\n }\n\n c += this.s;\n } else {\n c += this.s;\n\n while (i < a.t) {\n c += a[i];\n r[i++] = c & this.DM;\n c >>= this.DB;\n }\n\n c += a.s;\n }\n\n r.s = c < 0 ? -1 : 0;\n if (c > 0) r[i++] = c;else if (c < -1) r[i++] = this.DV + c;\n r.t = i;\n r.clamp();\n} // (public) this + a\n\n\nfunction bnAdd(a) {\n var r = nbi();\n this.addTo(a, r);\n return r;\n} // (public) this - a\n\n\nfunction bnSubtract(a) {\n var r = nbi();\n this.subTo(a, r);\n return r;\n} // (public) this * a\n\n\nfunction bnMultiply(a) {\n var r = nbi();\n this.multiplyTo(a, r);\n return r;\n} // (public) this / a\n\n\nfunction bnDivide(a) {\n var r = nbi();\n this.divRemTo(a, r, null);\n return r;\n} // Montgomery reduction\n\n\nfunction Montgomery(m) {\n this.m = m;\n this.mp = m.invDigit();\n this.mpl = this.mp & 0x7fff;\n this.mph = this.mp >> 15;\n this.um = (1 << m.DB - 15) - 1;\n this.mt2 = 2 * m.t;\n} // xR mod m\n\n\nfunction montConvert(x) {\n var r = nbi();\n x.abs().dlShiftTo(this.m.t, r);\n r.divRemTo(this.m, null, r);\n if (x.s < 0 && r.compareTo(BigInteger.ZERO) > 0) this.m.subTo(r, r);\n return r;\n} // x/R mod m\n\n\nfunction montRevert(x) {\n var r = nbi();\n x.copyTo(r);\n this.reduce(r);\n return r;\n} // x = x/R mod m (HAC 14.32)\n\n\nfunction montReduce(x) {\n while (x.t <= this.mt2) {\n // pad x so am has enough room later\n x[x.t++] = 0;\n }\n\n for (var i = 0; i < this.m.t; ++i) {\n // faster way of calculating u0 = x[i]*mp mod DV\n var j = x[i] & 0x7fff;\n var u0 = j * this.mpl + ((j * this.mph + (x[i] >> 15) * this.mpl & this.um) << 15) & x.DM; // use am to combine the multiply-shift-add into one call\n\n j = i + this.m.t;\n x[j] += this.m.am(0, u0, x, i, 0, this.m.t); // propagate carry\n\n while (x[j] >= x.DV) {\n x[j] -= x.DV;\n x[++j]++;\n }\n }\n\n x.clamp();\n x.drShiftTo(this.m.t, x);\n if (x.compareTo(this.m) >= 0) x.subTo(this.m, x);\n} // r = \"x^2/R mod m\"; x != r\n\n\nfunction montSqrTo(x, r) {\n x.squareTo(r);\n this.reduce(r);\n} // r = \"xy/R mod m\"; x,y != r\n\n\nfunction montMulTo(x, y, r) {\n x.multiplyTo(y, r);\n this.reduce(r);\n}\n\nMontgomery.prototype.convert = montConvert;\nMontgomery.prototype.revert = montRevert;\nMontgomery.prototype.reduce = montReduce;\nMontgomery.prototype.mulTo = montMulTo;\nMontgomery.prototype.sqrTo = montSqrTo; // (public) this^e % m (HAC 14.85)\n\nfunction bnModPow(e, m, callback) {\n var i = e.bitLength(),\n k,\n r = nbv(1),\n z = new Montgomery(m);\n if (i <= 0) return r;else if (i < 18) k = 1;else if (i < 48) k = 3;else if (i < 144) k = 4;else if (i < 768) k = 5;else k = 6; // precomputation\n\n var g = new Array(),\n n = 3,\n k1 = k - 1,\n km = (1 << k) - 1;\n g[1] = z.convert(this);\n\n if (k > 1) {\n var g2 = nbi();\n z.sqrTo(g[1], g2);\n\n while (n <= km) {\n g[n] = nbi();\n z.mulTo(g2, g[n - 2], g[n]);\n n += 2;\n }\n }\n\n var j = e.t - 1,\n w,\n is1 = true,\n r2 = nbi(),\n t;\n i = nbits(e[j]) - 1;\n\n while (j >= 0) {\n if (i >= k1) w = e[j] >> i - k1 & km;else {\n w = (e[j] & (1 << i + 1) - 1) << k1 - i;\n if (j > 0) w |= e[j - 1] >> this.DB + i - k1;\n }\n n = k;\n\n while ((w & 1) == 0) {\n w >>= 1;\n --n;\n }\n\n if ((i -= n) < 0) {\n i += this.DB;\n --j;\n }\n\n if (is1) {\n // ret == 1, don't bother squaring or multiplying it\n g[w].copyTo(r);\n is1 = false;\n } else {\n while (n > 1) {\n z.sqrTo(r, r2);\n z.sqrTo(r2, r);\n n -= 2;\n }\n\n if (n > 0) z.sqrTo(r, r2);else {\n t = r;\n r = r2;\n r2 = t;\n }\n z.mulTo(r2, g[w], r);\n }\n\n while (j >= 0 && (e[j] & 1 << i) == 0) {\n z.sqrTo(r, r2);\n t = r;\n r = r2;\n r2 = t;\n\n if (--i < 0) {\n i = this.DB - 1;\n --j;\n }\n }\n }\n\n var result = z.revert(r);\n callback(null, result);\n return result;\n} // protected\n\n\nBigInteger.prototype.copyTo = bnpCopyTo;\nBigInteger.prototype.fromInt = bnpFromInt;\nBigInteger.prototype.fromString = bnpFromString;\nBigInteger.prototype.clamp = bnpClamp;\nBigInteger.prototype.dlShiftTo = bnpDLShiftTo;\nBigInteger.prototype.drShiftTo = bnpDRShiftTo;\nBigInteger.prototype.lShiftTo = bnpLShiftTo;\nBigInteger.prototype.rShiftTo = bnpRShiftTo;\nBigInteger.prototype.subTo = bnpSubTo;\nBigInteger.prototype.multiplyTo = bnpMultiplyTo;\nBigInteger.prototype.squareTo = bnpSquareTo;\nBigInteger.prototype.divRemTo = bnpDivRemTo;\nBigInteger.prototype.invDigit = bnpInvDigit;\nBigInteger.prototype.addTo = bnpAddTo; // public\n\nBigInteger.prototype.toString = bnToString;\nBigInteger.prototype.negate = bnNegate;\nBigInteger.prototype.abs = bnAbs;\nBigInteger.prototype.compareTo = bnCompareTo;\nBigInteger.prototype.bitLength = bnBitLength;\nBigInteger.prototype.mod = bnMod;\nBigInteger.prototype.equals = bnEquals;\nBigInteger.prototype.add = bnAdd;\nBigInteger.prototype.subtract = bnSubtract;\nBigInteger.prototype.multiply = bnMultiply;\nBigInteger.prototype.divide = bnDivide;\nBigInteger.prototype.modPow = bnModPow; // \"constants\"\n\nBigInteger.ZERO = nbv(0);\nBigInteger.ONE = nbv(1);","function _classCallCheck(instance, Constructor) {\n if (!(instance instanceof Constructor)) {\n throw new TypeError(\"Cannot call a class as a function\");\n }\n}\n/*!\n * Copyright 2016 Amazon.com,\n * Inc. or its affiliates. All Rights Reserved.\n *\n * Licensed under the Amazon Software License (the \"License\").\n * You may not use this file except in compliance with the\n * License. A copy of the License is located at\n *\n * http://aws.amazon.com/asl/\n *\n * or in the \"license\" file accompanying this file. This file is\n * distributed on an \"AS IS\" BASIS, WITHOUT WARRANTIES OR\n * CONDITIONS OF ANY KIND, express or implied. See the License\n * for the specific language governing permissions and\n * limitations under the License.\n */\n\n\nimport { Buffer } from 'buffer/';\nimport CryptoJS from 'crypto-js/core';\nimport 'crypto-js/lib-typedarrays'; // necessary for crypto js\n\nimport SHA256 from 'crypto-js/sha256';\nimport HmacSHA256 from 'crypto-js/hmac-sha256';\n\nvar randomBytes = function randomBytes(nBytes) {\n return Buffer.from(CryptoJS.lib.WordArray.random(nBytes).toString(), 'hex');\n};\n\nimport BigInteger from './BigInteger';\nvar initN = 'FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD1' + '29024E088A67CC74020BBEA63B139B22514A08798E3404DD' + 'EF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245' + 'E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED' + 'EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3D' + 'C2007CB8A163BF0598DA48361C55D39A69163FA8FD24CF5F' + '83655D23DCA3AD961C62F356208552BB9ED529077096966D' + '670C354E4ABC9804F1746C08CA18217C32905E462E36CE3B' + 'E39E772C180E86039B2783A2EC07A28FB5C55DF06F4C52C9' + 'DE2BCBF6955817183995497CEA956AE515D2261898FA0510' + '15728E5A8AAAC42DAD33170D04507A33A85521ABDF1CBA64' + 'ECFB850458DBEF0A8AEA71575D060C7DB3970F85A6E1E4C7' + 'ABF5AE8CDB0933D71E8C94E04A25619DCEE3D2261AD2EE6B' + 'F12FFA06D98A0864D87602733EC86A64521F2B18177B200C' + 'BBE117577A615D6C770988C0BAD946E208E24FA074E5AB31' + '43DB5BFCE0FD108E4B82D120A93AD2CAFFFFFFFFFFFFFFFF';\nvar newPasswordRequiredChallengeUserAttributePrefix = 'userAttributes.';\n/** @class */\n\nvar AuthenticationHelper = function () {\n /**\n * Constructs a new AuthenticationHelper object\n * @param {string} PoolName Cognito user pool name.\n */\n function AuthenticationHelper(PoolName) {\n _classCallCheck(this, AuthenticationHelper);\n\n this.N = new BigInteger(initN, 16);\n this.g = new BigInteger('2', 16);\n this.k = new BigInteger(this.hexHash('00' + this.N.toString(16) + '0' + this.g.toString(16)), 16);\n this.smallAValue = this.generateRandomSmallA();\n this.getLargeAValue(function () {});\n this.infoBits = Buffer.from('Caldera Derived Key', 'utf8');\n this.poolName = PoolName;\n }\n /**\n * @returns {BigInteger} small A, a random number\n */\n\n\n AuthenticationHelper.prototype.getSmallAValue = function getSmallAValue() {\n return this.smallAValue;\n };\n /**\n * @param {nodeCallback' + func(text) + '
';\n * });\n *\n * p('fred, barney, & pebbles');\n * // => 'fred, barney, & pebbles
'\n */\n\n\n function wrap(value, wrapper) {\n return partial(castFunction(wrapper), value);\n }\n /*------------------------------------------------------------------------*/\n\n /**\n * Casts `value` as an array if it's not one.\n *\n * @static\n * @memberOf _\n * @since 4.4.0\n * @category Lang\n * @param {*} value The value to inspect.\n * @returns {Array} Returns the cast array.\n * @example\n *\n * _.castArray(1);\n * // => [1]\n *\n * _.castArray({ 'a': 1 });\n * // => [{ 'a': 1 }]\n *\n * _.castArray('abc');\n * // => ['abc']\n *\n * _.castArray(null);\n * // => [null]\n *\n * _.castArray(undefined);\n * // => [undefined]\n *\n * _.castArray();\n * // => []\n *\n * var array = [1, 2, 3];\n * console.log(_.castArray(array) === array);\n * // => true\n */\n\n\n function castArray() {\n if (!arguments.length) {\n return [];\n }\n\n var value = arguments[0];\n return isArray(value) ? value : [value];\n }\n /**\n * Creates a shallow clone of `value`.\n *\n * **Note:** This method is loosely based on the\n * [structured clone algorithm](https://mdn.io/Structured_clone_algorithm)\n * and supports cloning arrays, array buffers, booleans, date objects, maps,\n * numbers, `Object` objects, regexes, sets, strings, symbols, and typed\n * arrays. The own enumerable properties of `arguments` objects are cloned\n * as plain objects. An empty object is returned for uncloneable values such\n * as error objects, functions, DOM nodes, and WeakMaps.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to clone.\n * @returns {*} Returns the cloned value.\n * @see _.cloneDeep\n * @example\n *\n * var objects = [{ 'a': 1 }, { 'b': 2 }];\n *\n * var shallow = _.clone(objects);\n * console.log(shallow[0] === objects[0]);\n * // => true\n */\n\n\n function clone(value) {\n return baseClone(value, CLONE_SYMBOLS_FLAG);\n }\n /**\n * This method is like `_.clone` except that it accepts `customizer` which\n * is invoked to produce the cloned value. If `customizer` returns `undefined`,\n * cloning is handled by the method instead. The `customizer` is invoked with\n * up to four arguments; (value [, index|key, object, stack]).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to clone.\n * @param {Function} [customizer] The function to customize cloning.\n * @returns {*} Returns the cloned value.\n * @see _.cloneDeepWith\n * @example\n *\n * function customizer(value) {\n * if (_.isElement(value)) {\n * return value.cloneNode(false);\n * }\n * }\n *\n * var el = _.cloneWith(document.body, customizer);\n *\n * console.log(el === document.body);\n * // => false\n * console.log(el.nodeName);\n * // => 'BODY'\n * console.log(el.childNodes.length);\n * // => 0\n */\n\n\n function cloneWith(value, customizer) {\n customizer = typeof customizer == 'function' ? customizer : undefined;\n return baseClone(value, CLONE_SYMBOLS_FLAG, customizer);\n }\n /**\n * This method is like `_.clone` except that it recursively clones `value`.\n *\n * @static\n * @memberOf _\n * @since 1.0.0\n * @category Lang\n * @param {*} value The value to recursively clone.\n * @returns {*} Returns the deep cloned value.\n * @see _.clone\n * @example\n *\n * var objects = [{ 'a': 1 }, { 'b': 2 }];\n *\n * var deep = _.cloneDeep(objects);\n * console.log(deep[0] === objects[0]);\n * // => false\n */\n\n\n function cloneDeep(value) {\n return baseClone(value, CLONE_DEEP_FLAG | CLONE_SYMBOLS_FLAG);\n }\n /**\n * This method is like `_.cloneWith` except that it recursively clones `value`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to recursively clone.\n * @param {Function} [customizer] The function to customize cloning.\n * @returns {*} Returns the deep cloned value.\n * @see _.cloneWith\n * @example\n *\n * function customizer(value) {\n * if (_.isElement(value)) {\n * return value.cloneNode(true);\n * }\n * }\n *\n * var el = _.cloneDeepWith(document.body, customizer);\n *\n * console.log(el === document.body);\n * // => false\n * console.log(el.nodeName);\n * // => 'BODY'\n * console.log(el.childNodes.length);\n * // => 20\n */\n\n\n function cloneDeepWith(value, customizer) {\n customizer = typeof customizer == 'function' ? customizer : undefined;\n return baseClone(value, CLONE_DEEP_FLAG | CLONE_SYMBOLS_FLAG, customizer);\n }\n /**\n * Checks if `object` conforms to `source` by invoking the predicate\n * properties of `source` with the corresponding property values of `object`.\n *\n * **Note:** This method is equivalent to `_.conforms` when `source` is\n * partially applied.\n *\n * @static\n * @memberOf _\n * @since 4.14.0\n * @category Lang\n * @param {Object} object The object to inspect.\n * @param {Object} source The object of property predicates to conform to.\n * @returns {boolean} Returns `true` if `object` conforms, else `false`.\n * @example\n *\n * var object = { 'a': 1, 'b': 2 };\n *\n * _.conformsTo(object, { 'b': function(n) { return n > 1; } });\n * // => true\n *\n * _.conformsTo(object, { 'b': function(n) { return n > 2; } });\n * // => false\n */\n\n\n function conformsTo(object, source) {\n return source == null || baseConformsTo(object, source, keys(source));\n }\n /**\n * Performs a\n * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)\n * comparison between two values to determine if they are equivalent.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to compare.\n * @param {*} other The other value to compare.\n * @returns {boolean} Returns `true` if the values are equivalent, else `false`.\n * @example\n *\n * var object = { 'a': 1 };\n * var other = { 'a': 1 };\n *\n * _.eq(object, object);\n * // => true\n *\n * _.eq(object, other);\n * // => false\n *\n * _.eq('a', 'a');\n * // => true\n *\n * _.eq('a', Object('a'));\n * // => false\n *\n * _.eq(NaN, NaN);\n * // => true\n */\n\n\n function eq(value, other) {\n return value === other || value !== value && other !== other;\n }\n /**\n * Checks if `value` is greater than `other`.\n *\n * @static\n * @memberOf _\n * @since 3.9.0\n * @category Lang\n * @param {*} value The value to compare.\n * @param {*} other The other value to compare.\n * @returns {boolean} Returns `true` if `value` is greater than `other`,\n * else `false`.\n * @see _.lt\n * @example\n *\n * _.gt(3, 1);\n * // => true\n *\n * _.gt(3, 3);\n * // => false\n *\n * _.gt(1, 3);\n * // => false\n */\n\n\n var gt = createRelationalOperation(baseGt);\n /**\n * Checks if `value` is greater than or equal to `other`.\n *\n * @static\n * @memberOf _\n * @since 3.9.0\n * @category Lang\n * @param {*} value The value to compare.\n * @param {*} other The other value to compare.\n * @returns {boolean} Returns `true` if `value` is greater than or equal to\n * `other`, else `false`.\n * @see _.lte\n * @example\n *\n * _.gte(3, 1);\n * // => true\n *\n * _.gte(3, 3);\n * // => true\n *\n * _.gte(1, 3);\n * // => false\n */\n\n var gte = createRelationalOperation(function (value, other) {\n return value >= other;\n });\n /**\n * Checks if `value` is likely an `arguments` object.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is an `arguments` object,\n * else `false`.\n * @example\n *\n * _.isArguments(function() { return arguments; }());\n * // => true\n *\n * _.isArguments([1, 2, 3]);\n * // => false\n */\n\n var isArguments = baseIsArguments(function () {\n return arguments;\n }()) ? baseIsArguments : function (value) {\n return isObjectLike(value) && hasOwnProperty.call(value, 'callee') && !propertyIsEnumerable.call(value, 'callee');\n };\n /**\n * Checks if `value` is classified as an `Array` object.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is an array, else `false`.\n * @example\n *\n * _.isArray([1, 2, 3]);\n * // => true\n *\n * _.isArray(document.body.children);\n * // => false\n *\n * _.isArray('abc');\n * // => false\n *\n * _.isArray(_.noop);\n * // => false\n */\n\n var isArray = Array.isArray;\n /**\n * Checks if `value` is classified as an `ArrayBuffer` object.\n *\n * @static\n * @memberOf _\n * @since 4.3.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is an array buffer, else `false`.\n * @example\n *\n * _.isArrayBuffer(new ArrayBuffer(2));\n * // => true\n *\n * _.isArrayBuffer(new Array(2));\n * // => false\n */\n\n var isArrayBuffer = nodeIsArrayBuffer ? baseUnary(nodeIsArrayBuffer) : baseIsArrayBuffer;\n /**\n * Checks if `value` is array-like. A value is considered array-like if it's\n * not a function and has a `value.length` that's an integer greater than or\n * equal to `0` and less than or equal to `Number.MAX_SAFE_INTEGER`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is array-like, else `false`.\n * @example\n *\n * _.isArrayLike([1, 2, 3]);\n * // => true\n *\n * _.isArrayLike(document.body.children);\n * // => true\n *\n * _.isArrayLike('abc');\n * // => true\n *\n * _.isArrayLike(_.noop);\n * // => false\n */\n\n function isArrayLike(value) {\n return value != null && isLength(value.length) && !isFunction(value);\n }\n /**\n * This method is like `_.isArrayLike` except that it also checks if `value`\n * is an object.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is an array-like object,\n * else `false`.\n * @example\n *\n * _.isArrayLikeObject([1, 2, 3]);\n * // => true\n *\n * _.isArrayLikeObject(document.body.children);\n * // => true\n *\n * _.isArrayLikeObject('abc');\n * // => false\n *\n * _.isArrayLikeObject(_.noop);\n * // => false\n */\n\n\n function isArrayLikeObject(value) {\n return isObjectLike(value) && isArrayLike(value);\n }\n /**\n * Checks if `value` is classified as a boolean primitive or object.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a boolean, else `false`.\n * @example\n *\n * _.isBoolean(false);\n * // => true\n *\n * _.isBoolean(null);\n * // => false\n */\n\n\n function isBoolean(value) {\n return value === true || value === false || isObjectLike(value) && baseGetTag(value) == boolTag;\n }\n /**\n * Checks if `value` is a buffer.\n *\n * @static\n * @memberOf _\n * @since 4.3.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a buffer, else `false`.\n * @example\n *\n * _.isBuffer(new Buffer(2));\n * // => true\n *\n * _.isBuffer(new Uint8Array(2));\n * // => false\n */\n\n\n var isBuffer = nativeIsBuffer || stubFalse;\n /**\n * Checks if `value` is classified as a `Date` object.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a date object, else `false`.\n * @example\n *\n * _.isDate(new Date);\n * // => true\n *\n * _.isDate('Mon April 23 2012');\n * // => false\n */\n\n var isDate = nodeIsDate ? baseUnary(nodeIsDate) : baseIsDate;\n /**\n * Checks if `value` is likely a DOM element.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a DOM element, else `false`.\n * @example\n *\n * _.isElement(document.body);\n * // => true\n *\n * _.isElement('');\n * // => false\n */\n\n function isElement(value) {\n return isObjectLike(value) && value.nodeType === 1 && !isPlainObject(value);\n }\n /**\n * Checks if `value` is an empty object, collection, map, or set.\n *\n * Objects are considered empty if they have no own enumerable string keyed\n * properties.\n *\n * Array-like values such as `arguments` objects, arrays, buffers, strings, or\n * jQuery-like collections are considered empty if they have a `length` of `0`.\n * Similarly, maps and sets are considered empty if they have a `size` of `0`.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is empty, else `false`.\n * @example\n *\n * _.isEmpty(null);\n * // => true\n *\n * _.isEmpty(true);\n * // => true\n *\n * _.isEmpty(1);\n * // => true\n *\n * _.isEmpty([1, 2, 3]);\n * // => false\n *\n * _.isEmpty({ 'a': 1 });\n * // => false\n */\n\n\n function isEmpty(value) {\n if (value == null) {\n return true;\n }\n\n if (isArrayLike(value) && (isArray(value) || typeof value == 'string' || typeof value.splice == 'function' || isBuffer(value) || isTypedArray(value) || isArguments(value))) {\n return !value.length;\n }\n\n var tag = getTag(value);\n\n if (tag == mapTag || tag == setTag) {\n return !value.size;\n }\n\n if (isPrototype(value)) {\n return !baseKeys(value).length;\n }\n\n for (var key in value) {\n if (hasOwnProperty.call(value, key)) {\n return false;\n }\n }\n\n return true;\n }\n /**\n * Performs a deep comparison between two values to determine if they are\n * equivalent.\n *\n * **Note:** This method supports comparing arrays, array buffers, booleans,\n * date objects, error objects, maps, numbers, `Object` objects, regexes,\n * sets, strings, symbols, and typed arrays. `Object` objects are compared\n * by their own, not inherited, enumerable properties. Functions and DOM\n * nodes are compared by strict equality, i.e. `===`.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to compare.\n * @param {*} other The other value to compare.\n * @returns {boolean} Returns `true` if the values are equivalent, else `false`.\n * @example\n *\n * var object = { 'a': 1 };\n * var other = { 'a': 1 };\n *\n * _.isEqual(object, other);\n * // => true\n *\n * object === other;\n * // => false\n */\n\n\n function isEqual(value, other) {\n return baseIsEqual(value, other);\n }\n /**\n * This method is like `_.isEqual` except that it accepts `customizer` which\n * is invoked to compare values. If `customizer` returns `undefined`, comparisons\n * are handled by the method instead. The `customizer` is invoked with up to\n * six arguments: (objValue, othValue [, index|key, object, other, stack]).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to compare.\n * @param {*} other The other value to compare.\n * @param {Function} [customizer] The function to customize comparisons.\n * @returns {boolean} Returns `true` if the values are equivalent, else `false`.\n * @example\n *\n * function isGreeting(value) {\n * return /^h(?:i|ello)$/.test(value);\n * }\n *\n * function customizer(objValue, othValue) {\n * if (isGreeting(objValue) && isGreeting(othValue)) {\n * return true;\n * }\n * }\n *\n * var array = ['hello', 'goodbye'];\n * var other = ['hi', 'goodbye'];\n *\n * _.isEqualWith(array, other, customizer);\n * // => true\n */\n\n\n function isEqualWith(value, other, customizer) {\n customizer = typeof customizer == 'function' ? customizer : undefined;\n var result = customizer ? customizer(value, other) : undefined;\n return result === undefined ? baseIsEqual(value, other, undefined, customizer) : !!result;\n }\n /**\n * Checks if `value` is an `Error`, `EvalError`, `RangeError`, `ReferenceError`,\n * `SyntaxError`, `TypeError`, or `URIError` object.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is an error object, else `false`.\n * @example\n *\n * _.isError(new Error);\n * // => true\n *\n * _.isError(Error);\n * // => false\n */\n\n\n function isError(value) {\n if (!isObjectLike(value)) {\n return false;\n }\n\n var tag = baseGetTag(value);\n return tag == errorTag || tag == domExcTag || typeof value.message == 'string' && typeof value.name == 'string' && !isPlainObject(value);\n }\n /**\n * Checks if `value` is a finite primitive number.\n *\n * **Note:** This method is based on\n * [`Number.isFinite`](https://mdn.io/Number/isFinite).\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a finite number, else `false`.\n * @example\n *\n * _.isFinite(3);\n * // => true\n *\n * _.isFinite(Number.MIN_VALUE);\n * // => true\n *\n * _.isFinite(Infinity);\n * // => false\n *\n * _.isFinite('3');\n * // => false\n */\n\n\n function isFinite(value) {\n return typeof value == 'number' && nativeIsFinite(value);\n }\n /**\n * Checks if `value` is classified as a `Function` object.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a function, else `false`.\n * @example\n *\n * _.isFunction(_);\n * // => true\n *\n * _.isFunction(/abc/);\n * // => false\n */\n\n\n function isFunction(value) {\n if (!isObject(value)) {\n return false;\n } // The use of `Object#toString` avoids issues with the `typeof` operator\n // in Safari 9 which returns 'object' for typed arrays and other constructors.\n\n\n var tag = baseGetTag(value);\n return tag == funcTag || tag == genTag || tag == asyncTag || tag == proxyTag;\n }\n /**\n * Checks if `value` is an integer.\n *\n * **Note:** This method is based on\n * [`Number.isInteger`](https://mdn.io/Number/isInteger).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is an integer, else `false`.\n * @example\n *\n * _.isInteger(3);\n * // => true\n *\n * _.isInteger(Number.MIN_VALUE);\n * // => false\n *\n * _.isInteger(Infinity);\n * // => false\n *\n * _.isInteger('3');\n * // => false\n */\n\n\n function isInteger(value) {\n return typeof value == 'number' && value == toInteger(value);\n }\n /**\n * Checks if `value` is a valid array-like length.\n *\n * **Note:** This method is loosely based on\n * [`ToLength`](http://ecma-international.org/ecma-262/7.0/#sec-tolength).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a valid length, else `false`.\n * @example\n *\n * _.isLength(3);\n * // => true\n *\n * _.isLength(Number.MIN_VALUE);\n * // => false\n *\n * _.isLength(Infinity);\n * // => false\n *\n * _.isLength('3');\n * // => false\n */\n\n\n function isLength(value) {\n return typeof value == 'number' && value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER;\n }\n /**\n * Checks if `value` is the\n * [language type](http://www.ecma-international.org/ecma-262/7.0/#sec-ecmascript-language-types)\n * of `Object`. (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is an object, else `false`.\n * @example\n *\n * _.isObject({});\n * // => true\n *\n * _.isObject([1, 2, 3]);\n * // => true\n *\n * _.isObject(_.noop);\n * // => true\n *\n * _.isObject(null);\n * // => false\n */\n\n\n function isObject(value) {\n var type = typeof value;\n return value != null && (type == 'object' || type == 'function');\n }\n /**\n * Checks if `value` is object-like. A value is object-like if it's not `null`\n * and has a `typeof` result of \"object\".\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is object-like, else `false`.\n * @example\n *\n * _.isObjectLike({});\n * // => true\n *\n * _.isObjectLike([1, 2, 3]);\n * // => true\n *\n * _.isObjectLike(_.noop);\n * // => false\n *\n * _.isObjectLike(null);\n * // => false\n */\n\n\n function isObjectLike(value) {\n return value != null && typeof value == 'object';\n }\n /**\n * Checks if `value` is classified as a `Map` object.\n *\n * @static\n * @memberOf _\n * @since 4.3.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a map, else `false`.\n * @example\n *\n * _.isMap(new Map);\n * // => true\n *\n * _.isMap(new WeakMap);\n * // => false\n */\n\n\n var isMap = nodeIsMap ? baseUnary(nodeIsMap) : baseIsMap;\n /**\n * Performs a partial deep comparison between `object` and `source` to\n * determine if `object` contains equivalent property values.\n *\n * **Note:** This method is equivalent to `_.matches` when `source` is\n * partially applied.\n *\n * Partial comparisons will match empty array and empty object `source`\n * values against any array or object value, respectively. See `_.isEqual`\n * for a list of supported value comparisons.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Lang\n * @param {Object} object The object to inspect.\n * @param {Object} source The object of property values to match.\n * @returns {boolean} Returns `true` if `object` is a match, else `false`.\n * @example\n *\n * var object = { 'a': 1, 'b': 2 };\n *\n * _.isMatch(object, { 'b': 2 });\n * // => true\n *\n * _.isMatch(object, { 'b': 1 });\n * // => false\n */\n\n function isMatch(object, source) {\n return object === source || baseIsMatch(object, source, getMatchData(source));\n }\n /**\n * This method is like `_.isMatch` except that it accepts `customizer` which\n * is invoked to compare values. If `customizer` returns `undefined`, comparisons\n * are handled by the method instead. The `customizer` is invoked with five\n * arguments: (objValue, srcValue, index|key, object, source).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {Object} object The object to inspect.\n * @param {Object} source The object of property values to match.\n * @param {Function} [customizer] The function to customize comparisons.\n * @returns {boolean} Returns `true` if `object` is a match, else `false`.\n * @example\n *\n * function isGreeting(value) {\n * return /^h(?:i|ello)$/.test(value);\n * }\n *\n * function customizer(objValue, srcValue) {\n * if (isGreeting(objValue) && isGreeting(srcValue)) {\n * return true;\n * }\n * }\n *\n * var object = { 'greeting': 'hello' };\n * var source = { 'greeting': 'hi' };\n *\n * _.isMatchWith(object, source, customizer);\n * // => true\n */\n\n\n function isMatchWith(object, source, customizer) {\n customizer = typeof customizer == 'function' ? customizer : undefined;\n return baseIsMatch(object, source, getMatchData(source), customizer);\n }\n /**\n * Checks if `value` is `NaN`.\n *\n * **Note:** This method is based on\n * [`Number.isNaN`](https://mdn.io/Number/isNaN) and is not the same as\n * global [`isNaN`](https://mdn.io/isNaN) which returns `true` for\n * `undefined` and other non-number values.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is `NaN`, else `false`.\n * @example\n *\n * _.isNaN(NaN);\n * // => true\n *\n * _.isNaN(new Number(NaN));\n * // => true\n *\n * isNaN(undefined);\n * // => true\n *\n * _.isNaN(undefined);\n * // => false\n */\n\n\n function isNaN(value) {\n // An `NaN` primitive is the only value that is not equal to itself.\n // Perform the `toStringTag` check first to avoid errors with some\n // ActiveX objects in IE.\n return isNumber(value) && value != +value;\n }\n /**\n * Checks if `value` is a pristine native function.\n *\n * **Note:** This method can't reliably detect native functions in the presence\n * of the core-js package because core-js circumvents this kind of detection.\n * Despite multiple requests, the core-js maintainer has made it clear: any\n * attempt to fix the detection will be obstructed. As a result, we're left\n * with little choice but to throw an error. Unfortunately, this also affects\n * packages, like [babel-polyfill](https://www.npmjs.com/package/babel-polyfill),\n * which rely on core-js.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a native function,\n * else `false`.\n * @example\n *\n * _.isNative(Array.prototype.push);\n * // => true\n *\n * _.isNative(_);\n * // => false\n */\n\n\n function isNative(value) {\n if (isMaskable(value)) {\n throw new Error(CORE_ERROR_TEXT);\n }\n\n return baseIsNative(value);\n }\n /**\n * Checks if `value` is `null`.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is `null`, else `false`.\n * @example\n *\n * _.isNull(null);\n * // => true\n *\n * _.isNull(void 0);\n * // => false\n */\n\n\n function isNull(value) {\n return value === null;\n }\n /**\n * Checks if `value` is `null` or `undefined`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is nullish, else `false`.\n * @example\n *\n * _.isNil(null);\n * // => true\n *\n * _.isNil(void 0);\n * // => true\n *\n * _.isNil(NaN);\n * // => false\n */\n\n\n function isNil(value) {\n return value == null;\n }\n /**\n * Checks if `value` is classified as a `Number` primitive or object.\n *\n * **Note:** To exclude `Infinity`, `-Infinity`, and `NaN`, which are\n * classified as numbers, use the `_.isFinite` method.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a number, else `false`.\n * @example\n *\n * _.isNumber(3);\n * // => true\n *\n * _.isNumber(Number.MIN_VALUE);\n * // => true\n *\n * _.isNumber(Infinity);\n * // => true\n *\n * _.isNumber('3');\n * // => false\n */\n\n\n function isNumber(value) {\n return typeof value == 'number' || isObjectLike(value) && baseGetTag(value) == numberTag;\n }\n /**\n * Checks if `value` is a plain object, that is, an object created by the\n * `Object` constructor or one with a `[[Prototype]]` of `null`.\n *\n * @static\n * @memberOf _\n * @since 0.8.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a plain object, else `false`.\n * @example\n *\n * function Foo() {\n * this.a = 1;\n * }\n *\n * _.isPlainObject(new Foo);\n * // => false\n *\n * _.isPlainObject([1, 2, 3]);\n * // => false\n *\n * _.isPlainObject({ 'x': 0, 'y': 0 });\n * // => true\n *\n * _.isPlainObject(Object.create(null));\n * // => true\n */\n\n\n function isPlainObject(value) {\n if (!isObjectLike(value) || baseGetTag(value) != objectTag) {\n return false;\n }\n\n var proto = getPrototype(value);\n\n if (proto === null) {\n return true;\n }\n\n var Ctor = hasOwnProperty.call(proto, 'constructor') && proto.constructor;\n return typeof Ctor == 'function' && Ctor instanceof Ctor && funcToString.call(Ctor) == objectCtorString;\n }\n /**\n * Checks if `value` is classified as a `RegExp` object.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a regexp, else `false`.\n * @example\n *\n * _.isRegExp(/abc/);\n * // => true\n *\n * _.isRegExp('/abc/');\n * // => false\n */\n\n\n var isRegExp = nodeIsRegExp ? baseUnary(nodeIsRegExp) : baseIsRegExp;\n /**\n * Checks if `value` is a safe integer. An integer is safe if it's an IEEE-754\n * double precision number which isn't the result of a rounded unsafe integer.\n *\n * **Note:** This method is based on\n * [`Number.isSafeInteger`](https://mdn.io/Number/isSafeInteger).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a safe integer, else `false`.\n * @example\n *\n * _.isSafeInteger(3);\n * // => true\n *\n * _.isSafeInteger(Number.MIN_VALUE);\n * // => false\n *\n * _.isSafeInteger(Infinity);\n * // => false\n *\n * _.isSafeInteger('3');\n * // => false\n */\n\n function isSafeInteger(value) {\n return isInteger(value) && value >= -MAX_SAFE_INTEGER && value <= MAX_SAFE_INTEGER;\n }\n /**\n * Checks if `value` is classified as a `Set` object.\n *\n * @static\n * @memberOf _\n * @since 4.3.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a set, else `false`.\n * @example\n *\n * _.isSet(new Set);\n * // => true\n *\n * _.isSet(new WeakSet);\n * // => false\n */\n\n\n var isSet = nodeIsSet ? baseUnary(nodeIsSet) : baseIsSet;\n /**\n * Checks if `value` is classified as a `String` primitive or object.\n *\n * @static\n * @since 0.1.0\n * @memberOf _\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a string, else `false`.\n * @example\n *\n * _.isString('abc');\n * // => true\n *\n * _.isString(1);\n * // => false\n */\n\n function isString(value) {\n return typeof value == 'string' || !isArray(value) && isObjectLike(value) && baseGetTag(value) == stringTag;\n }\n /**\n * Checks if `value` is classified as a `Symbol` primitive or object.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a symbol, else `false`.\n * @example\n *\n * _.isSymbol(Symbol.iterator);\n * // => true\n *\n * _.isSymbol('abc');\n * // => false\n */\n\n\n function isSymbol(value) {\n return typeof value == 'symbol' || isObjectLike(value) && baseGetTag(value) == symbolTag;\n }\n /**\n * Checks if `value` is classified as a typed array.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a typed array, else `false`.\n * @example\n *\n * _.isTypedArray(new Uint8Array);\n * // => true\n *\n * _.isTypedArray([]);\n * // => false\n */\n\n\n var isTypedArray = nodeIsTypedArray ? baseUnary(nodeIsTypedArray) : baseIsTypedArray;\n /**\n * Checks if `value` is `undefined`.\n *\n * @static\n * @since 0.1.0\n * @memberOf _\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is `undefined`, else `false`.\n * @example\n *\n * _.isUndefined(void 0);\n * // => true\n *\n * _.isUndefined(null);\n * // => false\n */\n\n function isUndefined(value) {\n return value === undefined;\n }\n /**\n * Checks if `value` is classified as a `WeakMap` object.\n *\n * @static\n * @memberOf _\n * @since 4.3.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a weak map, else `false`.\n * @example\n *\n * _.isWeakMap(new WeakMap);\n * // => true\n *\n * _.isWeakMap(new Map);\n * // => false\n */\n\n\n function isWeakMap(value) {\n return isObjectLike(value) && getTag(value) == weakMapTag;\n }\n /**\n * Checks if `value` is classified as a `WeakSet` object.\n *\n * @static\n * @memberOf _\n * @since 4.3.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a weak set, else `false`.\n * @example\n *\n * _.isWeakSet(new WeakSet);\n * // => true\n *\n * _.isWeakSet(new Set);\n * // => false\n */\n\n\n function isWeakSet(value) {\n return isObjectLike(value) && baseGetTag(value) == weakSetTag;\n }\n /**\n * Checks if `value` is less than `other`.\n *\n * @static\n * @memberOf _\n * @since 3.9.0\n * @category Lang\n * @param {*} value The value to compare.\n * @param {*} other The other value to compare.\n * @returns {boolean} Returns `true` if `value` is less than `other`,\n * else `false`.\n * @see _.gt\n * @example\n *\n * _.lt(1, 3);\n * // => true\n *\n * _.lt(3, 3);\n * // => false\n *\n * _.lt(3, 1);\n * // => false\n */\n\n\n var lt = createRelationalOperation(baseLt);\n /**\n * Checks if `value` is less than or equal to `other`.\n *\n * @static\n * @memberOf _\n * @since 3.9.0\n * @category Lang\n * @param {*} value The value to compare.\n * @param {*} other The other value to compare.\n * @returns {boolean} Returns `true` if `value` is less than or equal to\n * `other`, else `false`.\n * @see _.gte\n * @example\n *\n * _.lte(1, 3);\n * // => true\n *\n * _.lte(3, 3);\n * // => true\n *\n * _.lte(3, 1);\n * // => false\n */\n\n var lte = createRelationalOperation(function (value, other) {\n return value <= other;\n });\n /**\n * Converts `value` to an array.\n *\n * @static\n * @since 0.1.0\n * @memberOf _\n * @category Lang\n * @param {*} value The value to convert.\n * @returns {Array} Returns the converted array.\n * @example\n *\n * _.toArray({ 'a': 1, 'b': 2 });\n * // => [1, 2]\n *\n * _.toArray('abc');\n * // => ['a', 'b', 'c']\n *\n * _.toArray(1);\n * // => []\n *\n * _.toArray(null);\n * // => []\n */\n\n function toArray(value) {\n if (!value) {\n return [];\n }\n\n if (isArrayLike(value)) {\n return isString(value) ? stringToArray(value) : copyArray(value);\n }\n\n if (symIterator && value[symIterator]) {\n return iteratorToArray(value[symIterator]());\n }\n\n var tag = getTag(value),\n func = tag == mapTag ? mapToArray : tag == setTag ? setToArray : values;\n return func(value);\n }\n /**\n * Converts `value` to a finite number.\n *\n * @static\n * @memberOf _\n * @since 4.12.0\n * @category Lang\n * @param {*} value The value to convert.\n * @returns {number} Returns the converted number.\n * @example\n *\n * _.toFinite(3.2);\n * // => 3.2\n *\n * _.toFinite(Number.MIN_VALUE);\n * // => 5e-324\n *\n * _.toFinite(Infinity);\n * // => 1.7976931348623157e+308\n *\n * _.toFinite('3.2');\n * // => 3.2\n */\n\n\n function toFinite(value) {\n if (!value) {\n return value === 0 ? value : 0;\n }\n\n value = toNumber(value);\n\n if (value === INFINITY || value === -INFINITY) {\n var sign = value < 0 ? -1 : 1;\n return sign * MAX_INTEGER;\n }\n\n return value === value ? value : 0;\n }\n /**\n * Converts `value` to an integer.\n *\n * **Note:** This method is loosely based on\n * [`ToInteger`](http://www.ecma-international.org/ecma-262/7.0/#sec-tointeger).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to convert.\n * @returns {number} Returns the converted integer.\n * @example\n *\n * _.toInteger(3.2);\n * // => 3\n *\n * _.toInteger(Number.MIN_VALUE);\n * // => 0\n *\n * _.toInteger(Infinity);\n * // => 1.7976931348623157e+308\n *\n * _.toInteger('3.2');\n * // => 3\n */\n\n\n function toInteger(value) {\n var result = toFinite(value),\n remainder = result % 1;\n return result === result ? remainder ? result - remainder : result : 0;\n }\n /**\n * Converts `value` to an integer suitable for use as the length of an\n * array-like object.\n *\n * **Note:** This method is based on\n * [`ToLength`](http://ecma-international.org/ecma-262/7.0/#sec-tolength).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to convert.\n * @returns {number} Returns the converted integer.\n * @example\n *\n * _.toLength(3.2);\n * // => 3\n *\n * _.toLength(Number.MIN_VALUE);\n * // => 0\n *\n * _.toLength(Infinity);\n * // => 4294967295\n *\n * _.toLength('3.2');\n * // => 3\n */\n\n\n function toLength(value) {\n return value ? baseClamp(toInteger(value), 0, MAX_ARRAY_LENGTH) : 0;\n }\n /**\n * Converts `value` to a number.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to process.\n * @returns {number} Returns the number.\n * @example\n *\n * _.toNumber(3.2);\n * // => 3.2\n *\n * _.toNumber(Number.MIN_VALUE);\n * // => 5e-324\n *\n * _.toNumber(Infinity);\n * // => Infinity\n *\n * _.toNumber('3.2');\n * // => 3.2\n */\n\n\n function toNumber(value) {\n if (typeof value == 'number') {\n return value;\n }\n\n if (isSymbol(value)) {\n return NAN;\n }\n\n if (isObject(value)) {\n var other = typeof value.valueOf == 'function' ? value.valueOf() : value;\n value = isObject(other) ? other + '' : other;\n }\n\n if (typeof value != 'string') {\n return value === 0 ? value : +value;\n }\n\n value = value.replace(reTrim, '');\n var isBinary = reIsBinary.test(value);\n return isBinary || reIsOctal.test(value) ? freeParseInt(value.slice(2), isBinary ? 2 : 8) : reIsBadHex.test(value) ? NAN : +value;\n }\n /**\n * Converts `value` to a plain object flattening inherited enumerable string\n * keyed properties of `value` to own properties of the plain object.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Lang\n * @param {*} value The value to convert.\n * @returns {Object} Returns the converted plain object.\n * @example\n *\n * function Foo() {\n * this.b = 2;\n * }\n *\n * Foo.prototype.c = 3;\n *\n * _.assign({ 'a': 1 }, new Foo);\n * // => { 'a': 1, 'b': 2 }\n *\n * _.assign({ 'a': 1 }, _.toPlainObject(new Foo));\n * // => { 'a': 1, 'b': 2, 'c': 3 }\n */\n\n\n function toPlainObject(value) {\n return copyObject(value, keysIn(value));\n }\n /**\n * Converts `value` to a safe integer. A safe integer can be compared and\n * represented correctly.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to convert.\n * @returns {number} Returns the converted integer.\n * @example\n *\n * _.toSafeInteger(3.2);\n * // => 3\n *\n * _.toSafeInteger(Number.MIN_VALUE);\n * // => 0\n *\n * _.toSafeInteger(Infinity);\n * // => 9007199254740991\n *\n * _.toSafeInteger('3.2');\n * // => 3\n */\n\n\n function toSafeInteger(value) {\n return value ? baseClamp(toInteger(value), -MAX_SAFE_INTEGER, MAX_SAFE_INTEGER) : value === 0 ? value : 0;\n }\n /**\n * Converts `value` to a string. An empty string is returned for `null`\n * and `undefined` values. The sign of `-0` is preserved.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to convert.\n * @returns {string} Returns the converted string.\n * @example\n *\n * _.toString(null);\n * // => ''\n *\n * _.toString(-0);\n * // => '-0'\n *\n * _.toString([1, 2, 3]);\n * // => '1,2,3'\n */\n\n\n function toString(value) {\n return value == null ? '' : baseToString(value);\n }\n /*------------------------------------------------------------------------*/\n\n /**\n * Assigns own enumerable string keyed properties of source objects to the\n * destination object. Source objects are applied from left to right.\n * Subsequent sources overwrite property assignments of previous sources.\n *\n * **Note:** This method mutates `object` and is loosely based on\n * [`Object.assign`](https://mdn.io/Object/assign).\n *\n * @static\n * @memberOf _\n * @since 0.10.0\n * @category Object\n * @param {Object} object The destination object.\n * @param {...Object} [sources] The source objects.\n * @returns {Object} Returns `object`.\n * @see _.assignIn\n * @example\n *\n * function Foo() {\n * this.a = 1;\n * }\n *\n * function Bar() {\n * this.c = 3;\n * }\n *\n * Foo.prototype.b = 2;\n * Bar.prototype.d = 4;\n *\n * _.assign({ 'a': 0 }, new Foo, new Bar);\n * // => { 'a': 1, 'c': 3 }\n */\n\n\n var assign = createAssigner(function (object, source) {\n if (isPrototype(source) || isArrayLike(source)) {\n copyObject(source, keys(source), object);\n return;\n }\n\n for (var key in source) {\n if (hasOwnProperty.call(source, key)) {\n assignValue(object, key, source[key]);\n }\n }\n });\n /**\n * This method is like `_.assign` except that it iterates over own and\n * inherited source properties.\n *\n * **Note:** This method mutates `object`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @alias extend\n * @category Object\n * @param {Object} object The destination object.\n * @param {...Object} [sources] The source objects.\n * @returns {Object} Returns `object`.\n * @see _.assign\n * @example\n *\n * function Foo() {\n * this.a = 1;\n * }\n *\n * function Bar() {\n * this.c = 3;\n * }\n *\n * Foo.prototype.b = 2;\n * Bar.prototype.d = 4;\n *\n * _.assignIn({ 'a': 0 }, new Foo, new Bar);\n * // => { 'a': 1, 'b': 2, 'c': 3, 'd': 4 }\n */\n\n var assignIn = createAssigner(function (object, source) {\n copyObject(source, keysIn(source), object);\n });\n /**\n * This method is like `_.assignIn` except that it accepts `customizer`\n * which is invoked to produce the assigned values. If `customizer` returns\n * `undefined`, assignment is handled by the method instead. The `customizer`\n * is invoked with five arguments: (objValue, srcValue, key, object, source).\n *\n * **Note:** This method mutates `object`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @alias extendWith\n * @category Object\n * @param {Object} object The destination object.\n * @param {...Object} sources The source objects.\n * @param {Function} [customizer] The function to customize assigned values.\n * @returns {Object} Returns `object`.\n * @see _.assignWith\n * @example\n *\n * function customizer(objValue, srcValue) {\n * return _.isUndefined(objValue) ? srcValue : objValue;\n * }\n *\n * var defaults = _.partialRight(_.assignInWith, customizer);\n *\n * defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 });\n * // => { 'a': 1, 'b': 2 }\n */\n\n var assignInWith = createAssigner(function (object, source, srcIndex, customizer) {\n copyObject(source, keysIn(source), object, customizer);\n });\n /**\n * This method is like `_.assign` except that it accepts `customizer`\n * which is invoked to produce the assigned values. If `customizer` returns\n * `undefined`, assignment is handled by the method instead. The `customizer`\n * is invoked with five arguments: (objValue, srcValue, key, object, source).\n *\n * **Note:** This method mutates `object`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Object\n * @param {Object} object The destination object.\n * @param {...Object} sources The source objects.\n * @param {Function} [customizer] The function to customize assigned values.\n * @returns {Object} Returns `object`.\n * @see _.assignInWith\n * @example\n *\n * function customizer(objValue, srcValue) {\n * return _.isUndefined(objValue) ? srcValue : objValue;\n * }\n *\n * var defaults = _.partialRight(_.assignWith, customizer);\n *\n * defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 });\n * // => { 'a': 1, 'b': 2 }\n */\n\n var assignWith = createAssigner(function (object, source, srcIndex, customizer) {\n copyObject(source, keys(source), object, customizer);\n });\n /**\n * Creates an array of values corresponding to `paths` of `object`.\n *\n * @static\n * @memberOf _\n * @since 1.0.0\n * @category Object\n * @param {Object} object The object to iterate over.\n * @param {...(string|string[])} [paths] The property paths to pick.\n * @returns {Array} Returns the picked values.\n * @example\n *\n * var object = { 'a': [{ 'b': { 'c': 3 } }, 4] };\n *\n * _.at(object, ['a[0].b.c', 'a[1]']);\n * // => [3, 4]\n */\n\n var at = flatRest(baseAt);\n /**\n * Creates an object that inherits from the `prototype` object. If a\n * `properties` object is given, its own enumerable string keyed properties\n * are assigned to the created object.\n *\n * @static\n * @memberOf _\n * @since 2.3.0\n * @category Object\n * @param {Object} prototype The object to inherit from.\n * @param {Object} [properties] The properties to assign to the object.\n * @returns {Object} Returns the new object.\n * @example\n *\n * function Shape() {\n * this.x = 0;\n * this.y = 0;\n * }\n *\n * function Circle() {\n * Shape.call(this);\n * }\n *\n * Circle.prototype = _.create(Shape.prototype, {\n * 'constructor': Circle\n * });\n *\n * var circle = new Circle;\n * circle instanceof Circle;\n * // => true\n *\n * circle instanceof Shape;\n * // => true\n */\n\n function create(prototype, properties) {\n var result = baseCreate(prototype);\n return properties == null ? result : baseAssign(result, properties);\n }\n /**\n * Assigns own and inherited enumerable string keyed properties of source\n * objects to the destination object for all destination properties that\n * resolve to `undefined`. Source objects are applied from left to right.\n * Once a property is set, additional values of the same property are ignored.\n *\n * **Note:** This method mutates `object`.\n *\n * @static\n * @since 0.1.0\n * @memberOf _\n * @category Object\n * @param {Object} object The destination object.\n * @param {...Object} [sources] The source objects.\n * @returns {Object} Returns `object`.\n * @see _.defaultsDeep\n * @example\n *\n * _.defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 });\n * // => { 'a': 1, 'b': 2 }\n */\n\n\n var defaults = baseRest(function (object, sources) {\n object = Object(object);\n var index = -1;\n var length = sources.length;\n var guard = length > 2 ? sources[2] : undefined;\n\n if (guard && isIterateeCall(sources[0], sources[1], guard)) {\n length = 1;\n }\n\n while (++index < length) {\n var source = sources[index];\n var props = keysIn(source);\n var propsIndex = -1;\n var propsLength = props.length;\n\n while (++propsIndex < propsLength) {\n var key = props[propsIndex];\n var value = object[key];\n\n if (value === undefined || eq(value, objectProto[key]) && !hasOwnProperty.call(object, key)) {\n object[key] = source[key];\n }\n }\n }\n\n return object;\n });\n /**\n * This method is like `_.defaults` except that it recursively assigns\n * default properties.\n *\n * **Note:** This method mutates `object`.\n *\n * @static\n * @memberOf _\n * @since 3.10.0\n * @category Object\n * @param {Object} object The destination object.\n * @param {...Object} [sources] The source objects.\n * @returns {Object} Returns `object`.\n * @see _.defaults\n * @example\n *\n * _.defaultsDeep({ 'a': { 'b': 2 } }, { 'a': { 'b': 1, 'c': 3 } });\n * // => { 'a': { 'b': 2, 'c': 3 } }\n */\n\n var defaultsDeep = baseRest(function (args) {\n args.push(undefined, customDefaultsMerge);\n return apply(mergeWith, undefined, args);\n });\n /**\n * This method is like `_.find` except that it returns the key of the first\n * element `predicate` returns truthy for instead of the element itself.\n *\n * @static\n * @memberOf _\n * @since 1.1.0\n * @category Object\n * @param {Object} object The object to inspect.\n * @param {Function} [predicate=_.identity] The function invoked per iteration.\n * @returns {string|undefined} Returns the key of the matched element,\n * else `undefined`.\n * @example\n *\n * var users = {\n * 'barney': { 'age': 36, 'active': true },\n * 'fred': { 'age': 40, 'active': false },\n * 'pebbles': { 'age': 1, 'active': true }\n * };\n *\n * _.findKey(users, function(o) { return o.age < 40; });\n * // => 'barney' (iteration order is not guaranteed)\n *\n * // The `_.matches` iteratee shorthand.\n * _.findKey(users, { 'age': 1, 'active': true });\n * // => 'pebbles'\n *\n * // The `_.matchesProperty` iteratee shorthand.\n * _.findKey(users, ['active', false]);\n * // => 'fred'\n *\n * // The `_.property` iteratee shorthand.\n * _.findKey(users, 'active');\n * // => 'barney'\n */\n\n function findKey(object, predicate) {\n return baseFindKey(object, getIteratee(predicate, 3), baseForOwn);\n }\n /**\n * This method is like `_.findKey` except that it iterates over elements of\n * a collection in the opposite order.\n *\n * @static\n * @memberOf _\n * @since 2.0.0\n * @category Object\n * @param {Object} object The object to inspect.\n * @param {Function} [predicate=_.identity] The function invoked per iteration.\n * @returns {string|undefined} Returns the key of the matched element,\n * else `undefined`.\n * @example\n *\n * var users = {\n * 'barney': { 'age': 36, 'active': true },\n * 'fred': { 'age': 40, 'active': false },\n * 'pebbles': { 'age': 1, 'active': true }\n * };\n *\n * _.findLastKey(users, function(o) { return o.age < 40; });\n * // => returns 'pebbles' assuming `_.findKey` returns 'barney'\n *\n * // The `_.matches` iteratee shorthand.\n * _.findLastKey(users, { 'age': 36, 'active': true });\n * // => 'barney'\n *\n * // The `_.matchesProperty` iteratee shorthand.\n * _.findLastKey(users, ['active', false]);\n * // => 'fred'\n *\n * // The `_.property` iteratee shorthand.\n * _.findLastKey(users, 'active');\n * // => 'pebbles'\n */\n\n\n function findLastKey(object, predicate) {\n return baseFindKey(object, getIteratee(predicate, 3), baseForOwnRight);\n }\n /**\n * Iterates over own and inherited enumerable string keyed properties of an\n * object and invokes `iteratee` for each property. The iteratee is invoked\n * with three arguments: (value, key, object). Iteratee functions may exit\n * iteration early by explicitly returning `false`.\n *\n * @static\n * @memberOf _\n * @since 0.3.0\n * @category Object\n * @param {Object} object The object to iterate over.\n * @param {Function} [iteratee=_.identity] The function invoked per iteration.\n * @returns {Object} Returns `object`.\n * @see _.forInRight\n * @example\n *\n * function Foo() {\n * this.a = 1;\n * this.b = 2;\n * }\n *\n * Foo.prototype.c = 3;\n *\n * _.forIn(new Foo, function(value, key) {\n * console.log(key);\n * });\n * // => Logs 'a', 'b', then 'c' (iteration order is not guaranteed).\n */\n\n\n function forIn(object, iteratee) {\n return object == null ? object : baseFor(object, getIteratee(iteratee, 3), keysIn);\n }\n /**\n * This method is like `_.forIn` except that it iterates over properties of\n * `object` in the opposite order.\n *\n * @static\n * @memberOf _\n * @since 2.0.0\n * @category Object\n * @param {Object} object The object to iterate over.\n * @param {Function} [iteratee=_.identity] The function invoked per iteration.\n * @returns {Object} Returns `object`.\n * @see _.forIn\n * @example\n *\n * function Foo() {\n * this.a = 1;\n * this.b = 2;\n * }\n *\n * Foo.prototype.c = 3;\n *\n * _.forInRight(new Foo, function(value, key) {\n * console.log(key);\n * });\n * // => Logs 'c', 'b', then 'a' assuming `_.forIn` logs 'a', 'b', then 'c'.\n */\n\n\n function forInRight(object, iteratee) {\n return object == null ? object : baseForRight(object, getIteratee(iteratee, 3), keysIn);\n }\n /**\n * Iterates over own enumerable string keyed properties of an object and\n * invokes `iteratee` for each property. The iteratee is invoked with three\n * arguments: (value, key, object). Iteratee functions may exit iteration\n * early by explicitly returning `false`.\n *\n * @static\n * @memberOf _\n * @since 0.3.0\n * @category Object\n * @param {Object} object The object to iterate over.\n * @param {Function} [iteratee=_.identity] The function invoked per iteration.\n * @returns {Object} Returns `object`.\n * @see _.forOwnRight\n * @example\n *\n * function Foo() {\n * this.a = 1;\n * this.b = 2;\n * }\n *\n * Foo.prototype.c = 3;\n *\n * _.forOwn(new Foo, function(value, key) {\n * console.log(key);\n * });\n * // => Logs 'a' then 'b' (iteration order is not guaranteed).\n */\n\n\n function forOwn(object, iteratee) {\n return object && baseForOwn(object, getIteratee(iteratee, 3));\n }\n /**\n * This method is like `_.forOwn` except that it iterates over properties of\n * `object` in the opposite order.\n *\n * @static\n * @memberOf _\n * @since 2.0.0\n * @category Object\n * @param {Object} object The object to iterate over.\n * @param {Function} [iteratee=_.identity] The function invoked per iteration.\n * @returns {Object} Returns `object`.\n * @see _.forOwn\n * @example\n *\n * function Foo() {\n * this.a = 1;\n * this.b = 2;\n * }\n *\n * Foo.prototype.c = 3;\n *\n * _.forOwnRight(new Foo, function(value, key) {\n * console.log(key);\n * });\n * // => Logs 'b' then 'a' assuming `_.forOwn` logs 'a' then 'b'.\n */\n\n\n function forOwnRight(object, iteratee) {\n return object && baseForOwnRight(object, getIteratee(iteratee, 3));\n }\n /**\n * Creates an array of function property names from own enumerable properties\n * of `object`.\n *\n * @static\n * @since 0.1.0\n * @memberOf _\n * @category Object\n * @param {Object} object The object to inspect.\n * @returns {Array} Returns the function names.\n * @see _.functionsIn\n * @example\n *\n * function Foo() {\n * this.a = _.constant('a');\n * this.b = _.constant('b');\n * }\n *\n * Foo.prototype.c = _.constant('c');\n *\n * _.functions(new Foo);\n * // => ['a', 'b']\n */\n\n\n function functions(object) {\n return object == null ? [] : baseFunctions(object, keys(object));\n }\n /**\n * Creates an array of function property names from own and inherited\n * enumerable properties of `object`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Object\n * @param {Object} object The object to inspect.\n * @returns {Array} Returns the function names.\n * @see _.functions\n * @example\n *\n * function Foo() {\n * this.a = _.constant('a');\n * this.b = _.constant('b');\n * }\n *\n * Foo.prototype.c = _.constant('c');\n *\n * _.functionsIn(new Foo);\n * // => ['a', 'b', 'c']\n */\n\n\n function functionsIn(object) {\n return object == null ? [] : baseFunctions(object, keysIn(object));\n }\n /**\n * Gets the value at `path` of `object`. If the resolved value is\n * `undefined`, the `defaultValue` is returned in its place.\n *\n * @static\n * @memberOf _\n * @since 3.7.0\n * @category Object\n * @param {Object} object The object to query.\n * @param {Array|string} path The path of the property to get.\n * @param {*} [defaultValue] The value returned for `undefined` resolved values.\n * @returns {*} Returns the resolved value.\n * @example\n *\n * var object = { 'a': [{ 'b': { 'c': 3 } }] };\n *\n * _.get(object, 'a[0].b.c');\n * // => 3\n *\n * _.get(object, ['a', '0', 'b', 'c']);\n * // => 3\n *\n * _.get(object, 'a.b.c', 'default');\n * // => 'default'\n */\n\n\n function get(object, path, defaultValue) {\n var result = object == null ? undefined : baseGet(object, path);\n return result === undefined ? defaultValue : result;\n }\n /**\n * Checks if `path` is a direct property of `object`.\n *\n * @static\n * @since 0.1.0\n * @memberOf _\n * @category Object\n * @param {Object} object The object to query.\n * @param {Array|string} path The path to check.\n * @returns {boolean} Returns `true` if `path` exists, else `false`.\n * @example\n *\n * var object = { 'a': { 'b': 2 } };\n * var other = _.create({ 'a': _.create({ 'b': 2 }) });\n *\n * _.has(object, 'a');\n * // => true\n *\n * _.has(object, 'a.b');\n * // => true\n *\n * _.has(object, ['a', 'b']);\n * // => true\n *\n * _.has(other, 'a');\n * // => false\n */\n\n\n function has(object, path) {\n return object != null && hasPath(object, path, baseHas);\n }\n /**\n * Checks if `path` is a direct or inherited property of `object`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Object\n * @param {Object} object The object to query.\n * @param {Array|string} path The path to check.\n * @returns {boolean} Returns `true` if `path` exists, else `false`.\n * @example\n *\n * var object = _.create({ 'a': _.create({ 'b': 2 }) });\n *\n * _.hasIn(object, 'a');\n * // => true\n *\n * _.hasIn(object, 'a.b');\n * // => true\n *\n * _.hasIn(object, ['a', 'b']);\n * // => true\n *\n * _.hasIn(object, 'b');\n * // => false\n */\n\n\n function hasIn(object, path) {\n return object != null && hasPath(object, path, baseHasIn);\n }\n /**\n * Creates an object composed of the inverted keys and values of `object`.\n * If `object` contains duplicate values, subsequent values overwrite\n * property assignments of previous values.\n *\n * @static\n * @memberOf _\n * @since 0.7.0\n * @category Object\n * @param {Object} object The object to invert.\n * @returns {Object} Returns the new inverted object.\n * @example\n *\n * var object = { 'a': 1, 'b': 2, 'c': 1 };\n *\n * _.invert(object);\n * // => { '1': 'c', '2': 'b' }\n */\n\n\n var invert = createInverter(function (result, value, key) {\n if (value != null && typeof value.toString != 'function') {\n value = nativeObjectToString.call(value);\n }\n\n result[value] = key;\n }, constant(identity));\n /**\n * This method is like `_.invert` except that the inverted object is generated\n * from the results of running each element of `object` thru `iteratee`. The\n * corresponding inverted value of each inverted key is an array of keys\n * responsible for generating the inverted value. The iteratee is invoked\n * with one argument: (value).\n *\n * @static\n * @memberOf _\n * @since 4.1.0\n * @category Object\n * @param {Object} object The object to invert.\n * @param {Function} [iteratee=_.identity] The iteratee invoked per element.\n * @returns {Object} Returns the new inverted object.\n * @example\n *\n * var object = { 'a': 1, 'b': 2, 'c': 1 };\n *\n * _.invertBy(object);\n * // => { '1': ['a', 'c'], '2': ['b'] }\n *\n * _.invertBy(object, function(value) {\n * return 'group' + value;\n * });\n * // => { 'group1': ['a', 'c'], 'group2': ['b'] }\n */\n\n var invertBy = createInverter(function (result, value, key) {\n if (value != null && typeof value.toString != 'function') {\n value = nativeObjectToString.call(value);\n }\n\n if (hasOwnProperty.call(result, value)) {\n result[value].push(key);\n } else {\n result[value] = [key];\n }\n }, getIteratee);\n /**\n * Invokes the method at `path` of `object`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Object\n * @param {Object} object The object to query.\n * @param {Array|string} path The path of the method to invoke.\n * @param {...*} [args] The arguments to invoke the method with.\n * @returns {*} Returns the result of the invoked method.\n * @example\n *\n * var object = { 'a': [{ 'b': { 'c': [1, 2, 3, 4] } }] };\n *\n * _.invoke(object, 'a[0].b.c.slice', 1, 3);\n * // => [2, 3]\n */\n\n var invoke = baseRest(baseInvoke);\n /**\n * Creates an array of the own enumerable property names of `object`.\n *\n * **Note:** Non-object values are coerced to objects. See the\n * [ES spec](http://ecma-international.org/ecma-262/7.0/#sec-object.keys)\n * for more details.\n *\n * @static\n * @since 0.1.0\n * @memberOf _\n * @category Object\n * @param {Object} object The object to query.\n * @returns {Array} Returns the array of property names.\n * @example\n *\n * function Foo() {\n * this.a = 1;\n * this.b = 2;\n * }\n *\n * Foo.prototype.c = 3;\n *\n * _.keys(new Foo);\n * // => ['a', 'b'] (iteration order is not guaranteed)\n *\n * _.keys('hi');\n * // => ['0', '1']\n */\n\n function keys(object) {\n return isArrayLike(object) ? arrayLikeKeys(object) : baseKeys(object);\n }\n /**\n * Creates an array of the own and inherited enumerable property names of `object`.\n *\n * **Note:** Non-object values are coerced to objects.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Object\n * @param {Object} object The object to query.\n * @returns {Array} Returns the array of property names.\n * @example\n *\n * function Foo() {\n * this.a = 1;\n * this.b = 2;\n * }\n *\n * Foo.prototype.c = 3;\n *\n * _.keysIn(new Foo);\n * // => ['a', 'b', 'c'] (iteration order is not guaranteed)\n */\n\n\n function keysIn(object) {\n return isArrayLike(object) ? arrayLikeKeys(object, true) : baseKeysIn(object);\n }\n /**\n * The opposite of `_.mapValues`; this method creates an object with the\n * same values as `object` and keys generated by running each own enumerable\n * string keyed property of `object` thru `iteratee`. The iteratee is invoked\n * with three arguments: (value, key, object).\n *\n * @static\n * @memberOf _\n * @since 3.8.0\n * @category Object\n * @param {Object} object The object to iterate over.\n * @param {Function} [iteratee=_.identity] The function invoked per iteration.\n * @returns {Object} Returns the new mapped object.\n * @see _.mapValues\n * @example\n *\n * _.mapKeys({ 'a': 1, 'b': 2 }, function(value, key) {\n * return key + value;\n * });\n * // => { 'a1': 1, 'b2': 2 }\n */\n\n\n function mapKeys(object, iteratee) {\n var result = {};\n iteratee = getIteratee(iteratee, 3);\n baseForOwn(object, function (value, key, object) {\n baseAssignValue(result, iteratee(value, key, object), value);\n });\n return result;\n }\n /**\n * Creates an object with the same keys as `object` and values generated\n * by running each own enumerable string keyed property of `object` thru\n * `iteratee`. The iteratee is invoked with three arguments:\n * (value, key, object).\n *\n * @static\n * @memberOf _\n * @since 2.4.0\n * @category Object\n * @param {Object} object The object to iterate over.\n * @param {Function} [iteratee=_.identity] The function invoked per iteration.\n * @returns {Object} Returns the new mapped object.\n * @see _.mapKeys\n * @example\n *\n * var users = {\n * 'fred': { 'user': 'fred', 'age': 40 },\n * 'pebbles': { 'user': 'pebbles', 'age': 1 }\n * };\n *\n * _.mapValues(users, function(o) { return o.age; });\n * // => { 'fred': 40, 'pebbles': 1 } (iteration order is not guaranteed)\n *\n * // The `_.property` iteratee shorthand.\n * _.mapValues(users, 'age');\n * // => { 'fred': 40, 'pebbles': 1 } (iteration order is not guaranteed)\n */\n\n\n function mapValues(object, iteratee) {\n var result = {};\n iteratee = getIteratee(iteratee, 3);\n baseForOwn(object, function (value, key, object) {\n baseAssignValue(result, key, iteratee(value, key, object));\n });\n return result;\n }\n /**\n * This method is like `_.assign` except that it recursively merges own and\n * inherited enumerable string keyed properties of source objects into the\n * destination object. Source properties that resolve to `undefined` are\n * skipped if a destination value exists. Array and plain object properties\n * are merged recursively. Other objects and value types are overridden by\n * assignment. Source objects are applied from left to right. Subsequent\n * sources overwrite property assignments of previous sources.\n *\n * **Note:** This method mutates `object`.\n *\n * @static\n * @memberOf _\n * @since 0.5.0\n * @category Object\n * @param {Object} object The destination object.\n * @param {...Object} [sources] The source objects.\n * @returns {Object} Returns `object`.\n * @example\n *\n * var object = {\n * 'a': [{ 'b': 2 }, { 'd': 4 }]\n * };\n *\n * var other = {\n * 'a': [{ 'c': 3 }, { 'e': 5 }]\n * };\n *\n * _.merge(object, other);\n * // => { 'a': [{ 'b': 2, 'c': 3 }, { 'd': 4, 'e': 5 }] }\n */\n\n\n var merge = createAssigner(function (object, source, srcIndex) {\n baseMerge(object, source, srcIndex);\n });\n /**\n * This method is like `_.merge` except that it accepts `customizer` which\n * is invoked to produce the merged values of the destination and source\n * properties. If `customizer` returns `undefined`, merging is handled by the\n * method instead. The `customizer` is invoked with six arguments:\n * (objValue, srcValue, key, object, source, stack).\n *\n * **Note:** This method mutates `object`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Object\n * @param {Object} object The destination object.\n * @param {...Object} sources The source objects.\n * @param {Function} customizer The function to customize assigned values.\n * @returns {Object} Returns `object`.\n * @example\n *\n * function customizer(objValue, srcValue) {\n * if (_.isArray(objValue)) {\n * return objValue.concat(srcValue);\n * }\n * }\n *\n * var object = { 'a': [1], 'b': [2] };\n * var other = { 'a': [3], 'b': [4] };\n *\n * _.mergeWith(object, other, customizer);\n * // => { 'a': [1, 3], 'b': [2, 4] }\n */\n\n var mergeWith = createAssigner(function (object, source, srcIndex, customizer) {\n baseMerge(object, source, srcIndex, customizer);\n });\n /**\n * The opposite of `_.pick`; this method creates an object composed of the\n * own and inherited enumerable property paths of `object` that are not omitted.\n *\n * **Note:** This method is considerably slower than `_.pick`.\n *\n * @static\n * @since 0.1.0\n * @memberOf _\n * @category Object\n * @param {Object} object The source object.\n * @param {...(string|string[])} [paths] The property paths to omit.\n * @returns {Object} Returns the new object.\n * @example\n *\n * var object = { 'a': 1, 'b': '2', 'c': 3 };\n *\n * _.omit(object, ['a', 'c']);\n * // => { 'b': '2' }\n */\n\n var omit = flatRest(function (object, paths) {\n var result = {};\n\n if (object == null) {\n return result;\n }\n\n var isDeep = false;\n paths = arrayMap(paths, function (path) {\n path = castPath(path, object);\n isDeep || (isDeep = path.length > 1);\n return path;\n });\n copyObject(object, getAllKeysIn(object), result);\n\n if (isDeep) {\n result = baseClone(result, CLONE_DEEP_FLAG | CLONE_FLAT_FLAG | CLONE_SYMBOLS_FLAG, customOmitClone);\n }\n\n var length = paths.length;\n\n while (length--) {\n baseUnset(result, paths[length]);\n }\n\n return result;\n });\n /**\n * The opposite of `_.pickBy`; this method creates an object composed of\n * the own and inherited enumerable string keyed properties of `object` that\n * `predicate` doesn't return truthy for. The predicate is invoked with two\n * arguments: (value, key).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Object\n * @param {Object} object The source object.\n * @param {Function} [predicate=_.identity] The function invoked per property.\n * @returns {Object} Returns the new object.\n * @example\n *\n * var object = { 'a': 1, 'b': '2', 'c': 3 };\n *\n * _.omitBy(object, _.isNumber);\n * // => { 'b': '2' }\n */\n\n function omitBy(object, predicate) {\n return pickBy(object, negate(getIteratee(predicate)));\n }\n /**\n * Creates an object composed of the picked `object` properties.\n *\n * @static\n * @since 0.1.0\n * @memberOf _\n * @category Object\n * @param {Object} object The source object.\n * @param {...(string|string[])} [paths] The property paths to pick.\n * @returns {Object} Returns the new object.\n * @example\n *\n * var object = { 'a': 1, 'b': '2', 'c': 3 };\n *\n * _.pick(object, ['a', 'c']);\n * // => { 'a': 1, 'c': 3 }\n */\n\n\n var pick = flatRest(function (object, paths) {\n return object == null ? {} : basePick(object, paths);\n });\n /**\n * Creates an object composed of the `object` properties `predicate` returns\n * truthy for. The predicate is invoked with two arguments: (value, key).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Object\n * @param {Object} object The source object.\n * @param {Function} [predicate=_.identity] The function invoked per property.\n * @returns {Object} Returns the new object.\n * @example\n *\n * var object = { 'a': 1, 'b': '2', 'c': 3 };\n *\n * _.pickBy(object, _.isNumber);\n * // => { 'a': 1, 'c': 3 }\n */\n\n function pickBy(object, predicate) {\n if (object == null) {\n return {};\n }\n\n var props = arrayMap(getAllKeysIn(object), function (prop) {\n return [prop];\n });\n predicate = getIteratee(predicate);\n return basePickBy(object, props, function (value, path) {\n return predicate(value, path[0]);\n });\n }\n /**\n * This method is like `_.get` except that if the resolved value is a\n * function it's invoked with the `this` binding of its parent object and\n * its result is returned.\n *\n * @static\n * @since 0.1.0\n * @memberOf _\n * @category Object\n * @param {Object} object The object to query.\n * @param {Array|string} path The path of the property to resolve.\n * @param {*} [defaultValue] The value returned for `undefined` resolved values.\n * @returns {*} Returns the resolved value.\n * @example\n *\n * var object = { 'a': [{ 'b': { 'c1': 3, 'c2': _.constant(4) } }] };\n *\n * _.result(object, 'a[0].b.c1');\n * // => 3\n *\n * _.result(object, 'a[0].b.c2');\n * // => 4\n *\n * _.result(object, 'a[0].b.c3', 'default');\n * // => 'default'\n *\n * _.result(object, 'a[0].b.c3', _.constant('default'));\n * // => 'default'\n */\n\n\n function result(object, path, defaultValue) {\n path = castPath(path, object);\n var index = -1,\n length = path.length; // Ensure the loop is entered when path is empty.\n\n if (!length) {\n length = 1;\n object = undefined;\n }\n\n while (++index < length) {\n var value = object == null ? undefined : object[toKey(path[index])];\n\n if (value === undefined) {\n index = length;\n value = defaultValue;\n }\n\n object = isFunction(value) ? value.call(object) : value;\n }\n\n return object;\n }\n /**\n * Sets the value at `path` of `object`. If a portion of `path` doesn't exist,\n * it's created. Arrays are created for missing index properties while objects\n * are created for all other missing properties. Use `_.setWith` to customize\n * `path` creation.\n *\n * **Note:** This method mutates `object`.\n *\n * @static\n * @memberOf _\n * @since 3.7.0\n * @category Object\n * @param {Object} object The object to modify.\n * @param {Array|string} path The path of the property to set.\n * @param {*} value The value to set.\n * @returns {Object} Returns `object`.\n * @example\n *\n * var object = { 'a': [{ 'b': { 'c': 3 } }] };\n *\n * _.set(object, 'a[0].b.c', 4);\n * console.log(object.a[0].b.c);\n * // => 4\n *\n * _.set(object, ['x', '0', 'y', 'z'], 5);\n * console.log(object.x[0].y.z);\n * // => 5\n */\n\n\n function set(object, path, value) {\n return object == null ? object : baseSet(object, path, value);\n }\n /**\n * This method is like `_.set` except that it accepts `customizer` which is\n * invoked to produce the objects of `path`. If `customizer` returns `undefined`\n * path creation is handled by the method instead. The `customizer` is invoked\n * with three arguments: (nsValue, key, nsObject).\n *\n * **Note:** This method mutates `object`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Object\n * @param {Object} object The object to modify.\n * @param {Array|string} path The path of the property to set.\n * @param {*} value The value to set.\n * @param {Function} [customizer] The function to customize assigned values.\n * @returns {Object} Returns `object`.\n * @example\n *\n * var object = {};\n *\n * _.setWith(object, '[0][1]', 'a', Object);\n * // => { '0': { '1': 'a' } }\n */\n\n\n function setWith(object, path, value, customizer) {\n customizer = typeof customizer == 'function' ? customizer : undefined;\n return object == null ? object : baseSet(object, path, value, customizer);\n }\n /**\n * Creates an array of own enumerable string keyed-value pairs for `object`\n * which can be consumed by `_.fromPairs`. If `object` is a map or set, its\n * entries are returned.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @alias entries\n * @category Object\n * @param {Object} object The object to query.\n * @returns {Array} Returns the key-value pairs.\n * @example\n *\n * function Foo() {\n * this.a = 1;\n * this.b = 2;\n * }\n *\n * Foo.prototype.c = 3;\n *\n * _.toPairs(new Foo);\n * // => [['a', 1], ['b', 2]] (iteration order is not guaranteed)\n */\n\n\n var toPairs = createToPairs(keys);\n /**\n * Creates an array of own and inherited enumerable string keyed-value pairs\n * for `object` which can be consumed by `_.fromPairs`. If `object` is a map\n * or set, its entries are returned.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @alias entriesIn\n * @category Object\n * @param {Object} object The object to query.\n * @returns {Array} Returns the key-value pairs.\n * @example\n *\n * function Foo() {\n * this.a = 1;\n * this.b = 2;\n * }\n *\n * Foo.prototype.c = 3;\n *\n * _.toPairsIn(new Foo);\n * // => [['a', 1], ['b', 2], ['c', 3]] (iteration order is not guaranteed)\n */\n\n var toPairsIn = createToPairs(keysIn);\n /**\n * An alternative to `_.reduce`; this method transforms `object` to a new\n * `accumulator` object which is the result of running each of its own\n * enumerable string keyed properties thru `iteratee`, with each invocation\n * potentially mutating the `accumulator` object. If `accumulator` is not\n * provided, a new object with the same `[[Prototype]]` will be used. The\n * iteratee is invoked with four arguments: (accumulator, value, key, object).\n * Iteratee functions may exit iteration early by explicitly returning `false`.\n *\n * @static\n * @memberOf _\n * @since 1.3.0\n * @category Object\n * @param {Object} object The object to iterate over.\n * @param {Function} [iteratee=_.identity] The function invoked per iteration.\n * @param {*} [accumulator] The custom accumulator value.\n * @returns {*} Returns the accumulated value.\n * @example\n *\n * _.transform([2, 3, 4], function(result, n) {\n * result.push(n *= n);\n * return n % 2 == 0;\n * }, []);\n * // => [4, 9]\n *\n * _.transform({ 'a': 1, 'b': 2, 'c': 1 }, function(result, value, key) {\n * (result[value] || (result[value] = [])).push(key);\n * }, {});\n * // => { '1': ['a', 'c'], '2': ['b'] }\n */\n\n function transform(object, iteratee, accumulator) {\n var isArr = isArray(object),\n isArrLike = isArr || isBuffer(object) || isTypedArray(object);\n iteratee = getIteratee(iteratee, 4);\n\n if (accumulator == null) {\n var Ctor = object && object.constructor;\n\n if (isArrLike) {\n accumulator = isArr ? new Ctor() : [];\n } else if (isObject(object)) {\n accumulator = isFunction(Ctor) ? baseCreate(getPrototype(object)) : {};\n } else {\n accumulator = {};\n }\n }\n\n (isArrLike ? arrayEach : baseForOwn)(object, function (value, index, object) {\n return iteratee(accumulator, value, index, object);\n });\n return accumulator;\n }\n /**\n * Removes the property at `path` of `object`.\n *\n * **Note:** This method mutates `object`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Object\n * @param {Object} object The object to modify.\n * @param {Array|string} path The path of the property to unset.\n * @returns {boolean} Returns `true` if the property is deleted, else `false`.\n * @example\n *\n * var object = { 'a': [{ 'b': { 'c': 7 } }] };\n * _.unset(object, 'a[0].b.c');\n * // => true\n *\n * console.log(object);\n * // => { 'a': [{ 'b': {} }] };\n *\n * _.unset(object, ['a', '0', 'b', 'c']);\n * // => true\n *\n * console.log(object);\n * // => { 'a': [{ 'b': {} }] };\n */\n\n\n function unset(object, path) {\n return object == null ? true : baseUnset(object, path);\n }\n /**\n * This method is like `_.set` except that accepts `updater` to produce the\n * value to set. Use `_.updateWith` to customize `path` creation. The `updater`\n * is invoked with one argument: (value).\n *\n * **Note:** This method mutates `object`.\n *\n * @static\n * @memberOf _\n * @since 4.6.0\n * @category Object\n * @param {Object} object The object to modify.\n * @param {Array|string} path The path of the property to set.\n * @param {Function} updater The function to produce the updated value.\n * @returns {Object} Returns `object`.\n * @example\n *\n * var object = { 'a': [{ 'b': { 'c': 3 } }] };\n *\n * _.update(object, 'a[0].b.c', function(n) { return n * n; });\n * console.log(object.a[0].b.c);\n * // => 9\n *\n * _.update(object, 'x[0].y.z', function(n) { return n ? n + 1 : 0; });\n * console.log(object.x[0].y.z);\n * // => 0\n */\n\n\n function update(object, path, updater) {\n return object == null ? object : baseUpdate(object, path, castFunction(updater));\n }\n /**\n * This method is like `_.update` except that it accepts `customizer` which is\n * invoked to produce the objects of `path`. If `customizer` returns `undefined`\n * path creation is handled by the method instead. The `customizer` is invoked\n * with three arguments: (nsValue, key, nsObject).\n *\n * **Note:** This method mutates `object`.\n *\n * @static\n * @memberOf _\n * @since 4.6.0\n * @category Object\n * @param {Object} object The object to modify.\n * @param {Array|string} path The path of the property to set.\n * @param {Function} updater The function to produce the updated value.\n * @param {Function} [customizer] The function to customize assigned values.\n * @returns {Object} Returns `object`.\n * @example\n *\n * var object = {};\n *\n * _.updateWith(object, '[0][1]', _.constant('a'), Object);\n * // => { '0': { '1': 'a' } }\n */\n\n\n function updateWith(object, path, updater, customizer) {\n customizer = typeof customizer == 'function' ? customizer : undefined;\n return object == null ? object : baseUpdate(object, path, castFunction(updater), customizer);\n }\n /**\n * Creates an array of the own enumerable string keyed property values of `object`.\n *\n * **Note:** Non-object values are coerced to objects.\n *\n * @static\n * @since 0.1.0\n * @memberOf _\n * @category Object\n * @param {Object} object The object to query.\n * @returns {Array} Returns the array of property values.\n * @example\n *\n * function Foo() {\n * this.a = 1;\n * this.b = 2;\n * }\n *\n * Foo.prototype.c = 3;\n *\n * _.values(new Foo);\n * // => [1, 2] (iteration order is not guaranteed)\n *\n * _.values('hi');\n * // => ['h', 'i']\n */\n\n\n function values(object) {\n return object == null ? [] : baseValues(object, keys(object));\n }\n /**\n * Creates an array of the own and inherited enumerable string keyed property\n * values of `object`.\n *\n * **Note:** Non-object values are coerced to objects.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Object\n * @param {Object} object The object to query.\n * @returns {Array} Returns the array of property values.\n * @example\n *\n * function Foo() {\n * this.a = 1;\n * this.b = 2;\n * }\n *\n * Foo.prototype.c = 3;\n *\n * _.valuesIn(new Foo);\n * // => [1, 2, 3] (iteration order is not guaranteed)\n */\n\n\n function valuesIn(object) {\n return object == null ? [] : baseValues(object, keysIn(object));\n }\n /*------------------------------------------------------------------------*/\n\n /**\n * Clamps `number` within the inclusive `lower` and `upper` bounds.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Number\n * @param {number} number The number to clamp.\n * @param {number} [lower] The lower bound.\n * @param {number} upper The upper bound.\n * @returns {number} Returns the clamped number.\n * @example\n *\n * _.clamp(-10, -5, 5);\n * // => -5\n *\n * _.clamp(10, -5, 5);\n * // => 5\n */\n\n\n function clamp(number, lower, upper) {\n if (upper === undefined) {\n upper = lower;\n lower = undefined;\n }\n\n if (upper !== undefined) {\n upper = toNumber(upper);\n upper = upper === upper ? upper : 0;\n }\n\n if (lower !== undefined) {\n lower = toNumber(lower);\n lower = lower === lower ? lower : 0;\n }\n\n return baseClamp(toNumber(number), lower, upper);\n }\n /**\n * Checks if `n` is between `start` and up to, but not including, `end`. If\n * `end` is not specified, it's set to `start` with `start` then set to `0`.\n * If `start` is greater than `end` the params are swapped to support\n * negative ranges.\n *\n * @static\n * @memberOf _\n * @since 3.3.0\n * @category Number\n * @param {number} number The number to check.\n * @param {number} [start=0] The start of the range.\n * @param {number} end The end of the range.\n * @returns {boolean} Returns `true` if `number` is in the range, else `false`.\n * @see _.range, _.rangeRight\n * @example\n *\n * _.inRange(3, 2, 4);\n * // => true\n *\n * _.inRange(4, 8);\n * // => true\n *\n * _.inRange(4, 2);\n * // => false\n *\n * _.inRange(2, 2);\n * // => false\n *\n * _.inRange(1.2, 2);\n * // => true\n *\n * _.inRange(5.2, 4);\n * // => false\n *\n * _.inRange(-3, -2, -6);\n * // => true\n */\n\n\n function inRange(number, start, end) {\n start = toFinite(start);\n\n if (end === undefined) {\n end = start;\n start = 0;\n } else {\n end = toFinite(end);\n }\n\n number = toNumber(number);\n return baseInRange(number, start, end);\n }\n /**\n * Produces a random number between the inclusive `lower` and `upper` bounds.\n * If only one argument is provided a number between `0` and the given number\n * is returned. If `floating` is `true`, or either `lower` or `upper` are\n * floats, a floating-point number is returned instead of an integer.\n *\n * **Note:** JavaScript follows the IEEE-754 standard for resolving\n * floating-point values which can produce unexpected results.\n *\n * @static\n * @memberOf _\n * @since 0.7.0\n * @category Number\n * @param {number} [lower=0] The lower bound.\n * @param {number} [upper=1] The upper bound.\n * @param {boolean} [floating] Specify returning a floating-point number.\n * @returns {number} Returns the random number.\n * @example\n *\n * _.random(0, 5);\n * // => an integer between 0 and 5\n *\n * _.random(5);\n * // => also an integer between 0 and 5\n *\n * _.random(5, true);\n * // => a floating-point number between 0 and 5\n *\n * _.random(1.2, 5.2);\n * // => a floating-point number between 1.2 and 5.2\n */\n\n\n function random(lower, upper, floating) {\n if (floating && typeof floating != 'boolean' && isIterateeCall(lower, upper, floating)) {\n upper = floating = undefined;\n }\n\n if (floating === undefined) {\n if (typeof upper == 'boolean') {\n floating = upper;\n upper = undefined;\n } else if (typeof lower == 'boolean') {\n floating = lower;\n lower = undefined;\n }\n }\n\n if (lower === undefined && upper === undefined) {\n lower = 0;\n upper = 1;\n } else {\n lower = toFinite(lower);\n\n if (upper === undefined) {\n upper = lower;\n lower = 0;\n } else {\n upper = toFinite(upper);\n }\n }\n\n if (lower > upper) {\n var temp = lower;\n lower = upper;\n upper = temp;\n }\n\n if (floating || lower % 1 || upper % 1) {\n var rand = nativeRandom();\n return nativeMin(lower + rand * (upper - lower + freeParseFloat('1e-' + ((rand + '').length - 1))), upper);\n }\n\n return baseRandom(lower, upper);\n }\n /*------------------------------------------------------------------------*/\n\n /**\n * Converts `string` to [camel case](https://en.wikipedia.org/wiki/CamelCase).\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category String\n * @param {string} [string=''] The string to convert.\n * @returns {string} Returns the camel cased string.\n * @example\n *\n * _.camelCase('Foo Bar');\n * // => 'fooBar'\n *\n * _.camelCase('--foo-bar--');\n * // => 'fooBar'\n *\n * _.camelCase('__FOO_BAR__');\n * // => 'fooBar'\n */\n\n\n var camelCase = createCompounder(function (result, word, index) {\n word = word.toLowerCase();\n return result + (index ? capitalize(word) : word);\n });\n /**\n * Converts the first character of `string` to upper case and the remaining\n * to lower case.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category String\n * @param {string} [string=''] The string to capitalize.\n * @returns {string} Returns the capitalized string.\n * @example\n *\n * _.capitalize('FRED');\n * // => 'Fred'\n */\n\n function capitalize(string) {\n return upperFirst(toString(string).toLowerCase());\n }\n /**\n * Deburrs `string` by converting\n * [Latin-1 Supplement](https://en.wikipedia.org/wiki/Latin-1_Supplement_(Unicode_block)#Character_table)\n * and [Latin Extended-A](https://en.wikipedia.org/wiki/Latin_Extended-A)\n * letters to basic Latin letters and removing\n * [combining diacritical marks](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks).\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category String\n * @param {string} [string=''] The string to deburr.\n * @returns {string} Returns the deburred string.\n * @example\n *\n * _.deburr('déjà vu');\n * // => 'deja vu'\n */\n\n\n function deburr(string) {\n string = toString(string);\n return string && string.replace(reLatin, deburrLetter).replace(reComboMark, '');\n }\n /**\n * Checks if `string` ends with the given target string.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category String\n * @param {string} [string=''] The string to inspect.\n * @param {string} [target] The string to search for.\n * @param {number} [position=string.length] The position to search up to.\n * @returns {boolean} Returns `true` if `string` ends with `target`,\n * else `false`.\n * @example\n *\n * _.endsWith('abc', 'c');\n * // => true\n *\n * _.endsWith('abc', 'b');\n * // => false\n *\n * _.endsWith('abc', 'b', 2);\n * // => true\n */\n\n\n function endsWith(string, target, position) {\n string = toString(string);\n target = baseToString(target);\n var length = string.length;\n position = position === undefined ? length : baseClamp(toInteger(position), 0, length);\n var end = position;\n position -= target.length;\n return position >= 0 && string.slice(position, end) == target;\n }\n /**\n * Converts the characters \"&\", \"<\", \">\", '\"', and \"'\" in `string` to their\n * corresponding HTML entities.\n *\n * **Note:** No other characters are escaped. To escape additional\n * characters use a third-party library like [_he_](https://mths.be/he).\n *\n * Though the \">\" character is escaped for symmetry, characters like\n * \">\" and \"/\" don't need escaping in HTML and have no special meaning\n * unless they're part of a tag or unquoted attribute value. See\n * [Mathias Bynens's article](https://mathiasbynens.be/notes/ambiguous-ampersands)\n * (under \"semi-related fun fact\") for more details.\n *\n * When working with HTML you should always\n * [quote attribute values](http://wonko.com/post/html-escaping) to reduce\n * XSS vectors.\n *\n * @static\n * @since 0.1.0\n * @memberOf _\n * @category String\n * @param {string} [string=''] The string to escape.\n * @returns {string} Returns the escaped string.\n * @example\n *\n * _.escape('fred, barney, & pebbles');\n * // => 'fred, barney, & pebbles'\n */\n\n\n function escape(string) {\n string = toString(string);\n return string && reHasUnescapedHtml.test(string) ? string.replace(reUnescapedHtml, escapeHtmlChar) : string;\n }\n /**\n * Escapes the `RegExp` special characters \"^\", \"$\", \"\\\", \".\", \"*\", \"+\",\n * \"?\", \"(\", \")\", \"[\", \"]\", \"{\", \"}\", and \"|\" in `string`.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category String\n * @param {string} [string=''] The string to escape.\n * @returns {string} Returns the escaped string.\n * @example\n *\n * _.escapeRegExp('[lodash](https://lodash.com/)');\n * // => '\\[lodash\\]\\(https://lodash\\.com/\\)'\n */\n\n\n function escapeRegExp(string) {\n string = toString(string);\n return string && reHasRegExpChar.test(string) ? string.replace(reRegExpChar, '\\\\$&') : string;\n }\n /**\n * Converts `string` to\n * [kebab case](https://en.wikipedia.org/wiki/Letter_case#Special_case_styles).\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category String\n * @param {string} [string=''] The string to convert.\n * @returns {string} Returns the kebab cased string.\n * @example\n *\n * _.kebabCase('Foo Bar');\n * // => 'foo-bar'\n *\n * _.kebabCase('fooBar');\n * // => 'foo-bar'\n *\n * _.kebabCase('__FOO_BAR__');\n * // => 'foo-bar'\n */\n\n\n var kebabCase = createCompounder(function (result, word, index) {\n return result + (index ? '-' : '') + word.toLowerCase();\n });\n /**\n * Converts `string`, as space separated words, to lower case.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category String\n * @param {string} [string=''] The string to convert.\n * @returns {string} Returns the lower cased string.\n * @example\n *\n * _.lowerCase('--Foo-Bar--');\n * // => 'foo bar'\n *\n * _.lowerCase('fooBar');\n * // => 'foo bar'\n *\n * _.lowerCase('__FOO_BAR__');\n * // => 'foo bar'\n */\n\n var lowerCase = createCompounder(function (result, word, index) {\n return result + (index ? ' ' : '') + word.toLowerCase();\n });\n /**\n * Converts the first character of `string` to lower case.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category String\n * @param {string} [string=''] The string to convert.\n * @returns {string} Returns the converted string.\n * @example\n *\n * _.lowerFirst('Fred');\n * // => 'fred'\n *\n * _.lowerFirst('FRED');\n * // => 'fRED'\n */\n\n var lowerFirst = createCaseFirst('toLowerCase');\n /**\n * Pads `string` on the left and right sides if it's shorter than `length`.\n * Padding characters are truncated if they can't be evenly divided by `length`.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category String\n * @param {string} [string=''] The string to pad.\n * @param {number} [length=0] The padding length.\n * @param {string} [chars=' '] The string used as padding.\n * @returns {string} Returns the padded string.\n * @example\n *\n * _.pad('abc', 8);\n * // => ' abc '\n *\n * _.pad('abc', 8, '_-');\n * // => '_-abc_-_'\n *\n * _.pad('abc', 3);\n * // => 'abc'\n */\n\n function pad(string, length, chars) {\n string = toString(string);\n length = toInteger(length);\n var strLength = length ? stringSize(string) : 0;\n\n if (!length || strLength >= length) {\n return string;\n }\n\n var mid = (length - strLength) / 2;\n return createPadding(nativeFloor(mid), chars) + string + createPadding(nativeCeil(mid), chars);\n }\n /**\n * Pads `string` on the right side if it's shorter than `length`. Padding\n * characters are truncated if they exceed `length`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category String\n * @param {string} [string=''] The string to pad.\n * @param {number} [length=0] The padding length.\n * @param {string} [chars=' '] The string used as padding.\n * @returns {string} Returns the padded string.\n * @example\n *\n * _.padEnd('abc', 6);\n * // => 'abc '\n *\n * _.padEnd('abc', 6, '_-');\n * // => 'abc_-_'\n *\n * _.padEnd('abc', 3);\n * // => 'abc'\n */\n\n\n function padEnd(string, length, chars) {\n string = toString(string);\n length = toInteger(length);\n var strLength = length ? stringSize(string) : 0;\n return length && strLength < length ? string + createPadding(length - strLength, chars) : string;\n }\n /**\n * Pads `string` on the left side if it's shorter than `length`. Padding\n * characters are truncated if they exceed `length`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category String\n * @param {string} [string=''] The string to pad.\n * @param {number} [length=0] The padding length.\n * @param {string} [chars=' '] The string used as padding.\n * @returns {string} Returns the padded string.\n * @example\n *\n * _.padStart('abc', 6);\n * // => ' abc'\n *\n * _.padStart('abc', 6, '_-');\n * // => '_-_abc'\n *\n * _.padStart('abc', 3);\n * // => 'abc'\n */\n\n\n function padStart(string, length, chars) {\n string = toString(string);\n length = toInteger(length);\n var strLength = length ? stringSize(string) : 0;\n return length && strLength < length ? createPadding(length - strLength, chars) + string : string;\n }\n /**\n * Converts `string` to an integer of the specified radix. If `radix` is\n * `undefined` or `0`, a `radix` of `10` is used unless `value` is a\n * hexadecimal, in which case a `radix` of `16` is used.\n *\n * **Note:** This method aligns with the\n * [ES5 implementation](https://es5.github.io/#x15.1.2.2) of `parseInt`.\n *\n * @static\n * @memberOf _\n * @since 1.1.0\n * @category String\n * @param {string} string The string to convert.\n * @param {number} [radix=10] The radix to interpret `value` by.\n * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.\n * @returns {number} Returns the converted integer.\n * @example\n *\n * _.parseInt('08');\n * // => 8\n *\n * _.map(['6', '08', '10'], _.parseInt);\n * // => [6, 8, 10]\n */\n\n\n function parseInt(string, radix, guard) {\n if (guard || radix == null) {\n radix = 0;\n } else if (radix) {\n radix = +radix;\n }\n\n return nativeParseInt(toString(string).replace(reTrimStart, ''), radix || 0);\n }\n /**\n * Repeats the given string `n` times.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category String\n * @param {string} [string=''] The string to repeat.\n * @param {number} [n=1] The number of times to repeat the string.\n * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.\n * @returns {string} Returns the repeated string.\n * @example\n *\n * _.repeat('*', 3);\n * // => '***'\n *\n * _.repeat('abc', 2);\n * // => 'abcabc'\n *\n * _.repeat('abc', 0);\n * // => ''\n */\n\n\n function repeat(string, n, guard) {\n if (guard ? isIterateeCall(string, n, guard) : n === undefined) {\n n = 1;\n } else {\n n = toInteger(n);\n }\n\n return baseRepeat(toString(string), n);\n }\n /**\n * Replaces matches for `pattern` in `string` with `replacement`.\n *\n * **Note:** This method is based on\n * [`String#replace`](https://mdn.io/String/replace).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category String\n * @param {string} [string=''] The string to modify.\n * @param {RegExp|string} pattern The pattern to replace.\n * @param {Function|string} replacement The match replacement.\n * @returns {string} Returns the modified string.\n * @example\n *\n * _.replace('Hi Fred', 'Fred', 'Barney');\n * // => 'Hi Barney'\n */\n\n\n function replace() {\n var args = arguments,\n string = toString(args[0]);\n return args.length < 3 ? string : string.replace(args[1], args[2]);\n }\n /**\n * Converts `string` to\n * [snake case](https://en.wikipedia.org/wiki/Snake_case).\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category String\n * @param {string} [string=''] The string to convert.\n * @returns {string} Returns the snake cased string.\n * @example\n *\n * _.snakeCase('Foo Bar');\n * // => 'foo_bar'\n *\n * _.snakeCase('fooBar');\n * // => 'foo_bar'\n *\n * _.snakeCase('--FOO-BAR--');\n * // => 'foo_bar'\n */\n\n\n var snakeCase = createCompounder(function (result, word, index) {\n return result + (index ? '_' : '') + word.toLowerCase();\n });\n /**\n * Splits `string` by `separator`.\n *\n * **Note:** This method is based on\n * [`String#split`](https://mdn.io/String/split).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category String\n * @param {string} [string=''] The string to split.\n * @param {RegExp|string} separator The separator pattern to split by.\n * @param {number} [limit] The length to truncate results to.\n * @returns {Array} Returns the string segments.\n * @example\n *\n * _.split('a-b-c', '-', 2);\n * // => ['a', 'b']\n */\n\n function split(string, separator, limit) {\n if (limit && typeof limit != 'number' && isIterateeCall(string, separator, limit)) {\n separator = limit = undefined;\n }\n\n limit = limit === undefined ? MAX_ARRAY_LENGTH : limit >>> 0;\n\n if (!limit) {\n return [];\n }\n\n string = toString(string);\n\n if (string && (typeof separator == 'string' || separator != null && !isRegExp(separator))) {\n separator = baseToString(separator);\n\n if (!separator && hasUnicode(string)) {\n return castSlice(stringToArray(string), 0, limit);\n }\n }\n\n return string.split(separator, limit);\n }\n /**\n * Converts `string` to\n * [start case](https://en.wikipedia.org/wiki/Letter_case#Stylistic_or_specialised_usage).\n *\n * @static\n * @memberOf _\n * @since 3.1.0\n * @category String\n * @param {string} [string=''] The string to convert.\n * @returns {string} Returns the start cased string.\n * @example\n *\n * _.startCase('--foo-bar--');\n * // => 'Foo Bar'\n *\n * _.startCase('fooBar');\n * // => 'Foo Bar'\n *\n * _.startCase('__FOO_BAR__');\n * // => 'FOO BAR'\n */\n\n\n var startCase = createCompounder(function (result, word, index) {\n return result + (index ? ' ' : '') + upperFirst(word);\n });\n /**\n * Checks if `string` starts with the given target string.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category String\n * @param {string} [string=''] The string to inspect.\n * @param {string} [target] The string to search for.\n * @param {number} [position=0] The position to search from.\n * @returns {boolean} Returns `true` if `string` starts with `target`,\n * else `false`.\n * @example\n *\n * _.startsWith('abc', 'a');\n * // => true\n *\n * _.startsWith('abc', 'b');\n * // => false\n *\n * _.startsWith('abc', 'b', 1);\n * // => true\n */\n\n function startsWith(string, target, position) {\n string = toString(string);\n position = position == null ? 0 : baseClamp(toInteger(position), 0, string.length);\n target = baseToString(target);\n return string.slice(position, position + target.length) == target;\n }\n /**\n * Creates a compiled template function that can interpolate data properties\n * in \"interpolate\" delimiters, HTML-escape interpolated data properties in\n * \"escape\" delimiters, and execute JavaScript in \"evaluate\" delimiters. Data\n * properties may be accessed as free variables in the template. If a setting\n * object is given, it takes precedence over `_.templateSettings` values.\n *\n * **Note:** In the development build `_.template` utilizes\n * [sourceURLs](http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/#toc-sourceurl)\n * for easier debugging.\n *\n * For more information on precompiling templates see\n * [lodash's custom builds documentation](https://lodash.com/custom-builds).\n *\n * For more information on Chrome extension sandboxes see\n * [Chrome's extensions documentation](https://developer.chrome.com/extensions/sandboxingEval).\n *\n * @static\n * @since 0.1.0\n * @memberOf _\n * @category String\n * @param {string} [string=''] The template string.\n * @param {Object} [options={}] The options object.\n * @param {RegExp} [options.escape=_.templateSettings.escape]\n * The HTML \"escape\" delimiter.\n * @param {RegExp} [options.evaluate=_.templateSettings.evaluate]\n * The \"evaluate\" delimiter.\n * @param {Object} [options.imports=_.templateSettings.imports]\n * An object to import into the template as free variables.\n * @param {RegExp} [options.interpolate=_.templateSettings.interpolate]\n * The \"interpolate\" delimiter.\n * @param {string} [options.sourceURL='lodash.templateSources[n]']\n * The sourceURL of the compiled template.\n * @param {string} [options.variable='obj']\n * The data object variable name.\n * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.\n * @returns {Function} Returns the compiled template function.\n * @example\n *\n * // Use the \"interpolate\" delimiter to create a compiled template.\n * var compiled = _.template('hello <%= user %>!');\n * compiled({ 'user': 'fred' });\n * // => 'hello fred!'\n *\n * // Use the HTML \"escape\" delimiter to escape data property values.\n * var compiled = _.template('<%- value %>');\n * compiled({ 'value': '