{"version":3,"file":"index.esm2017.js","sources":["../node_modules/google-closure-library/closure/goog/base.js","../node_modules/google-closure-library/closure/goog/disposable/disposable.js","../node_modules/google-closure-library/closure/goog/array/array.js","../node_modules/google-closure-library/closure/goog/events/event.js","../node_modules/google-closure-library/closure/goog/events/browserfeature.js","../node_modules/google-closure-library/closure/goog/string/internal.js","../node_modules/google-closure-library/closure/goog/labs/useragent/util.js","../node_modules/google-closure-library/closure/goog/reflect/reflect.js","../node_modules/google-closure-library/closure/goog/useragent/useragent.js","../node_modules/google-closure-library/closure/goog/net/xhrio.js","../node_modules/google-closure-library/closure/goog/labs/useragent/browser.js","../node_modules/google-closure-library/closure/goog/labs/useragent/engine.js","../node_modules/google-closure-library/closure/goog/events/browserevent.js","../node_modules/google-closure-library/closure/goog/events/eventtype.js","../node_modules/google-closure-library/closure/goog/events/listenable.js","../node_modules/google-closure-library/closure/goog/events/listenablekey.js","../node_modules/google-closure-library/closure/goog/events/listener.js","../node_modules/google-closure-library/closure/goog/events/listenermap.js","../node_modules/google-closure-library/closure/goog/object/object.js","../node_modules/google-closure-library/closure/goog/events/events.js","../node_modules/google-closure-library/closure/goog/events/eventtarget.js","../node_modules/google-closure-library/closure/goog/json/json.js","../node_modules/google-closure-library/closure/goog/async/workqueue.js","../node_modules/google-closure-library/closure/goog/async/run.js","../node_modules/google-closure-library/closure/goog/async/freelist.js","../node_modules/google-closure-library/closure/goog/async/throwexception.js","../node_modules/google-closure-library/closure/goog/timer/timer.js","../node_modules/google-closure-library/closure/goog/async/throttle.js","../node_modules/google-closure-library/closure/goog/events/eventhandler.js","../node_modules/google-closure-library/closure/goog/labs/net/webchannel/webchanneldebug.js","../node_modules/google-closure-library/closure/goog/labs/net/webchannel/requeststats.js","../node_modules/google-closure-library/closure/goog/net/errorcode.js","../node_modules/google-closure-library/closure/goog/net/eventtype.js","../node_modules/google-closure-library/closure/goog/net/xmlhttpfactory.js","../node_modules/google-closure-library/closure/goog/labs/net/webchannel.js","../node_modules/google-closure-library/closure/goog/net/xmlhttp.js","../node_modules/google-closure-library/closure/goog/labs/net/webchannel/channelrequest.js","../node_modules/google-closure-library/closure/goog/labs/net/webchannel/environment.js","../node_modules/google-closure-library/closure/goog/labs/net/webchannel/webchannelbase.js","../node_modules/google-closure-library/closure/goog/uri/uri.js","../node_modules/google-closure-library/closure/goog/string/string.js","../node_modules/google-closure-library/closure/goog/disposable/dispose.js","../node_modules/google-closure-library/closure/goog/labs/net/webchannel/wirev8.js","../node_modules/google-closure-library/closure/goog/labs/net/webchannel/forwardchannelrequestpool.js","../node_modules/google-closure-library/closure/goog/structs/structs.js","../node_modules/google-closure-library/closure/goog/uri/utils.js","../node_modules/google-closure-library/closure/goog/labs/net/webchannel/wire.js","../node_modules/google-closure-library/closure/goog/json/nativejsonprocessor.js","../node_modules/google-closure-library/closure/goog/labs/net/webchannel/netutils.js","../node_modules/google-closure-library/closure/goog/net/fetchxmlhttpfactory.js","../node_modules/google-closure-library/closure/goog/functions/functions.js","../node_modules/google-closure-library/closure/goog/json/hybrid.js","../node_modules/google-closure-library/closure/goog/net/httpstatus.js","../node_modules/google-closure-library/closure/goog/net/rpc/httpcors.js","../node_modules/google-closure-library/closure/goog/labs/net/webchanneltransport.js","../node_modules/google-closure-library/closure/goog/labs/net/webchannel/webchannelbasetransport.js","temp/src/index.js","../node_modules/google-closure-library/closure/goog/labs/net/webchanneltransportfactory.js"],"sourcesContent":["/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview Bootstrap for the Google JS Library (Closure).\n *\n * In uncompiled mode base.js will attempt to load Closure's deps file, unless\n * the global CLOSURE_NO_DEPS is set to true. This allows projects\n * to include their own deps file(s) from different locations.\n *\n * Avoid including base.js more than once. This is strictly discouraged and not\n * supported. goog.require(...) won't work properly in that case.\n *\n * @provideGoog\n */\n\n\n/**\n * @define {boolean} Overridden to true by the compiler.\n */\nvar COMPILED = false;\n\n\n/**\n * Base namespace for the Closure library. Checks to see goog is already\n * defined in the current scope before assigning to prevent clobbering if\n * base.js is loaded more than once.\n *\n * @const\n */\nvar goog = goog || {};\n\n/**\n * Reference to the global object.\n * https://www.ecma-international.org/ecma-262/9.0/index.html#sec-global-object\n *\n * More info on this implementation here:\n * https://docs.google.com/document/d/1NAeW4Wk7I7FV0Y2tcUFvQdGMc89k2vdgSXInw8_nvCI/edit\n *\n * @const\n * @suppress {undefinedVars} self won't be referenced unless `this` is falsy.\n * @type {!Global}\n */\ngoog.global =\n // Check `this` first for backwards compatibility.\n // Valid unless running as an ES module or in a function wrapper called\n // without setting `this` properly.\n // Note that base.js can't usefully be imported as an ES module, but it may\n // be compiled into bundles that are loadable as ES modules.\n this ||\n // https://developer.mozilla.org/en-US/docs/Web/API/Window/self\n // For in-page browser environments and workers.\n self;\n\n\n/**\n * A hook for overriding the define values in uncompiled mode.\n *\n * In uncompiled mode, `CLOSURE_UNCOMPILED_DEFINES` may be defined before\n * loading base.js. If a key is defined in `CLOSURE_UNCOMPILED_DEFINES`,\n * `goog.define` will use the value instead of the default value. This\n * allows flags to be overwritten without compilation (this is normally\n * accomplished with the compiler's \"define\" flag).\n *\n * Example:\n * 
\n *   var CLOSURE_UNCOMPILED_DEFINES = {'goog.DEBUG': false};\n *
\n *\n * @type {Object|undefined}\n */\ngoog.global.CLOSURE_UNCOMPILED_DEFINES;\n\n\n/**\n * A hook for overriding the define values in uncompiled or compiled mode,\n * like CLOSURE_UNCOMPILED_DEFINES but effective in compiled code. In\n * uncompiled code CLOSURE_UNCOMPILED_DEFINES takes precedence.\n *\n * Also unlike CLOSURE_UNCOMPILED_DEFINES the values must be number, boolean or\n * string literals or the compiler will emit an error.\n *\n * While any @define value may be set, only those set with goog.define will be\n * effective for uncompiled code.\n *\n * Example:\n * 
\n *   var CLOSURE_DEFINES = {'goog.DEBUG': false} ;\n *
\n *\n * Currently the Closure Compiler will only recognize very simple definitions of\n * this value when looking for values to apply to compiled code and ignore all\n * other references. Specifically, it looks the value defined at the variable\n * declaration, as with the example above.\n *\n * TODO(user): Improve the recognized definitions.\n *\n * @type {!Object|null|undefined}\n */\ngoog.global.CLOSURE_DEFINES;\n\n\n/**\n * Builds an object structure for the provided namespace path, ensuring that\n * names that already exist are not overwritten. For example:\n * \"a.b.c\" -> a = {};a.b={};a.b.c={};\n * Used by goog.provide and goog.exportSymbol.\n * @param {string} name The name of the object that this file defines.\n * @param {*=} object The object to expose at the end of the path.\n * @param {boolean=} overwriteImplicit If object is set and a previous call\n * implicitly constructed the namespace given by name, this parameter\n * controls whether object should overwrite the implicitly constructed\n * namespace or be merged into it. Defaults to false.\n * @param {?Object=} objectToExportTo The object to add the path to; if this\n * field is not specified, its value defaults to `goog.global`.\n * @private\n */\ngoog.exportPath_ = function(name, object, overwriteImplicit, objectToExportTo) {\n var parts = name.split('.');\n var cur = objectToExportTo || goog.global;\n\n // Internet Explorer exhibits strange behavior when throwing errors from\n // methods externed in this manner. See the testExportSymbolExceptions in\n // base_test.html for an example.\n if (!(parts[0] in cur) && typeof cur.execScript != 'undefined') {\n cur.execScript('var ' + parts[0]);\n }\n\n for (var part; parts.length && (part = parts.shift());) {\n if (!parts.length && object !== undefined) {\n if (!overwriteImplicit && goog.isObject(object) &&\n goog.isObject(cur[part])) {\n // Merge properties on object (the input parameter) with the existing\n // implicitly defined namespace, so as to not clobber previously\n // defined child namespaces.\n for (var prop in object) {\n if (object.hasOwnProperty(prop)) {\n cur[part][prop] = object[prop];\n }\n }\n } else {\n // Either there is no existing implicit namespace, or overwriteImplicit\n // is set to true, so directly assign object (the input parameter) to\n // the namespace.\n cur[part] = object;\n }\n } else if (cur[part] && cur[part] !== Object.prototype[part]) {\n cur = cur[part];\n } else {\n cur = cur[part] = {};\n }\n }\n};\n\n\n/**\n * Defines a named value. In uncompiled mode, the value is retrieved from\n * CLOSURE_DEFINES or CLOSURE_UNCOMPILED_DEFINES if the object is defined and\n * has the property specified, and otherwise used the defined defaultValue.\n * When compiled the default can be overridden using the compiler options or the\n * value set in the CLOSURE_DEFINES object. Returns the defined value so that it\n * can be used safely in modules. Note that the value type MUST be either\n * boolean, number, or string.\n *\n * @param {string} name The distinguished name to provide.\n * @param {T} defaultValue\n * @return {T} The defined value.\n * @template T\n */\ngoog.define = function(name, defaultValue) {\n var value = defaultValue;\n if (!COMPILED) {\n var uncompiledDefines = goog.global.CLOSURE_UNCOMPILED_DEFINES;\n var defines = goog.global.CLOSURE_DEFINES;\n if (uncompiledDefines &&\n // Anti DOM-clobbering runtime check (b/37736576).\n /** @type {?} */ (uncompiledDefines).nodeType === undefined &&\n Object.prototype.hasOwnProperty.call(uncompiledDefines, name)) {\n value = uncompiledDefines[name];\n } else if (\n defines &&\n // Anti DOM-clobbering runtime check (b/37736576).\n /** @type {?} */ (defines).nodeType === undefined &&\n Object.prototype.hasOwnProperty.call(defines, name)) {\n value = defines[name];\n }\n }\n return value;\n};\n\n\n/**\n * @define {number} Integer year indicating the set of browser features that are\n * guaranteed to be present. This is defined to include exactly features that\n * work correctly on all \"modern\" browsers that are stable on January 1 of the\n * specified year. For example,\n * ```js\n * if (goog.FEATURESET_YEAR >= 2019) {\n * // use APIs known to be available on all major stable browsers Jan 1, 2019\n * } else {\n * // polyfill for older browsers\n * }\n * ```\n * This is intended to be the primary define for removing\n * unnecessary browser compatibility code (such as ponyfills and workarounds),\n * and should inform the default value for most other defines:\n * ```js\n * const ASSUME_NATIVE_PROMISE =\n * goog.define('ASSUME_NATIVE_PROMISE', goog.FEATURESET_YEAR >= 2016);\n * ```\n *\n * The default assumption is that IE9 is the lowest supported browser, which was\n * first available Jan 1, 2012.\n *\n * TODO(user): Reference more thorough documentation when it's available.\n */\ngoog.FEATURESET_YEAR = goog.define('goog.FEATURESET_YEAR', 2012);\n\n\n/**\n * @define {boolean} DEBUG is provided as a convenience so that debugging code\n * that should not be included in a production. It can be easily stripped\n * by specifying --define goog.DEBUG=false to the Closure Compiler aka\n * JSCompiler. For example, most toString() methods should be declared inside an\n * \"if (goog.DEBUG)\" conditional because they are generally used for debugging\n * purposes and it is difficult for the JSCompiler to statically determine\n * whether they are used.\n */\ngoog.DEBUG = goog.define('goog.DEBUG', true);\n\n\n/**\n * @define {string} LOCALE defines the locale being used for compilation. It is\n * used to select locale specific data to be compiled in js binary. BUILD rule\n * can specify this value by \"--define goog.LOCALE=\" as a compiler\n * option.\n *\n * Take into account that the locale code format is important. You should use\n * the canonical Unicode format with hyphen as a delimiter. Language must be\n * lowercase, Language Script - Capitalized, Region - UPPERCASE.\n * There are few examples: pt-BR, en, en-US, sr-Latin-BO, zh-Hans-CN.\n *\n * See more info about locale codes here:\n * http://www.unicode.org/reports/tr35/#Unicode_Language_and_Locale_Identifiers\n *\n * For language codes you should use values defined by ISO 693-1. See it here\n * http://www.w3.org/WAI/ER/IG/ert/iso639.htm. There is only one exception from\n * this rule: the Hebrew language. For legacy reasons the old code (iw) should\n * be used instead of the new code (he).\n *\n */\ngoog.LOCALE = goog.define('goog.LOCALE', 'en'); // default to en\n\n\n/**\n * This method is intended to be used for bookkeeping purposes. We would\n * like to distinguish uses of goog.LOCALE used for code stripping purposes\n * and uses of goog.LOCALE for other uses (such as URL parameters).\n *\n * This allows us to ban direct uses of goog.LOCALE and to ensure that all\n * code has been transformed to our new localization build scheme.\n *\n * @return {string}\n *\n */\ngoog.getLocale = function() {\n return goog.LOCALE;\n};\n\n\n/**\n * @define {boolean} Whether this code is running on trusted sites.\n *\n * On untrusted sites, several native functions can be defined or overridden by\n * external libraries like Prototype, Datejs, and JQuery and setting this flag\n * to false forces closure to use its own implementations when possible.\n *\n * If your JavaScript can be loaded by a third party site and you are wary about\n * relying on non-standard implementations, specify\n * \"--define goog.TRUSTED_SITE=false\" to the compiler.\n */\ngoog.TRUSTED_SITE = goog.define('goog.TRUSTED_SITE', true);\n\n\n/**\n * @define {boolean} Whether code that calls {@link goog.setTestOnly} should\n * be disallowed in the compilation unit.\n */\ngoog.DISALLOW_TEST_ONLY_CODE =\n goog.define('goog.DISALLOW_TEST_ONLY_CODE', COMPILED && !goog.DEBUG);\n\n\n/**\n * @define {boolean} Whether to use a Chrome app CSP-compliant method for\n * loading scripts via goog.require. @see appendScriptSrcNode_.\n */\ngoog.ENABLE_CHROME_APP_SAFE_SCRIPT_LOADING =\n goog.define('goog.ENABLE_CHROME_APP_SAFE_SCRIPT_LOADING', false);\n\n\n/**\n * Defines a namespace in Closure.\n *\n * A namespace may only be defined once in a codebase. It may be defined using\n * goog.provide() or goog.module().\n *\n * The presence of one or more goog.provide() calls in a file indicates\n * that the file defines the given objects/namespaces.\n * Provided symbols must not be null or undefined.\n *\n * In addition, goog.provide() creates the object stubs for a namespace\n * (for example, goog.provide(\"goog.foo.bar\") will create the object\n * goog.foo.bar if it does not already exist).\n *\n * Build tools also scan for provide/require/module statements\n * to discern dependencies, build dependency files (see deps.js), etc.\n *\n * @see goog.require\n * @see goog.module\n * @param {string} name Namespace provided by this file in the form\n * \"goog.package.part\".\n * deprecated Use goog.module (see b/159289405)\n */\ngoog.provide = function(name) {\n if (goog.isInModuleLoader_()) {\n throw new Error('goog.provide cannot be used within a module.');\n }\n if (!COMPILED) {\n // Ensure that the same namespace isn't provided twice.\n // A goog.module/goog.provide maps a goog.require to a specific file\n if (goog.isProvided_(name)) {\n throw new Error('Namespace \"' + name + '\" already declared.');\n }\n }\n\n goog.constructNamespace_(name);\n};\n\n\n/**\n * @param {string} name Namespace provided by this file in the form\n * \"goog.package.part\".\n * @param {?Object=} object The object to embed in the namespace.\n * @param {boolean=} overwriteImplicit If object is set and a previous call\n * implicitly constructed the namespace given by name, this parameter\n * controls whether opt_obj should overwrite the implicitly constructed\n * namespace or be merged into it. Defaults to false.\n * @private\n */\ngoog.constructNamespace_ = function(name, object, overwriteImplicit) {\n if (!COMPILED) {\n delete goog.implicitNamespaces_[name];\n\n var namespace = name;\n while ((namespace = namespace.substring(0, namespace.lastIndexOf('.')))) {\n if (goog.getObjectByName(namespace)) {\n break;\n }\n goog.implicitNamespaces_[namespace] = true;\n }\n }\n\n goog.exportPath_(name, object, overwriteImplicit);\n};\n\n\n/**\n * According to the CSP3 spec a nonce must be a valid base64 string.\n * @see https://www.w3.org/TR/CSP3/#grammardef-base64-value\n * @private @const\n */\ngoog.NONCE_PATTERN_ = /^[\\w+/_-]+[=]{0,2}$/;\n\n\n/**\n * Returns CSP nonce, if set for any script tag.\n * @param {?Window=} opt_window The window context used to retrieve the nonce.\n * Defaults to global context.\n * @return {string} CSP nonce or empty string if no nonce is present.\n * @private\n */\ngoog.getScriptNonce_ = function(opt_window) {\n var doc = (opt_window || goog.global).document;\n var script = doc.querySelector && doc.querySelector('script[nonce]');\n if (script) {\n // Try to get the nonce from the IDL property first, because browsers that\n // implement additional nonce protection features (currently only Chrome) to\n // prevent nonce stealing via CSS do not expose the nonce via attributes.\n // See https://github.com/whatwg/html/issues/2369\n var nonce = script['nonce'] || script.getAttribute('nonce');\n if (nonce && goog.NONCE_PATTERN_.test(nonce)) {\n return nonce;\n }\n }\n return '';\n};\n\n\n/**\n * Module identifier validation regexp.\n * Note: This is a conservative check, it is very possible to be more lenient,\n * the primary exclusion here is \"/\" and \"\\\" and a leading \".\", these\n * restrictions are intended to leave the door open for using goog.require\n * with relative file paths rather than module identifiers.\n * @private\n */\ngoog.VALID_MODULE_RE_ = /^[a-zA-Z_$][a-zA-Z0-9._$]*$/;\n\n\n/**\n * Defines a module in Closure.\n *\n * Marks that this file must be loaded as a module and claims the namespace.\n *\n * A namespace may only be defined once in a codebase. It may be defined using\n * goog.provide() or goog.module().\n *\n * goog.module() has three requirements:\n * - goog.module may not be used in the same file as goog.provide.\n * - goog.module must be the first statement in the file.\n * - only one goog.module is allowed per file.\n *\n * When a goog.module annotated file is loaded, it is enclosed in\n * a strict function closure. This means that:\n * - any variables declared in a goog.module file are private to the file\n * (not global), though the compiler is expected to inline the module.\n * - The code must obey all the rules of \"strict\" JavaScript.\n * - the file will be marked as \"use strict\"\n *\n * NOTE: unlike goog.provide, goog.module does not declare any symbols by\n * itself. If declared symbols are desired, use\n * goog.module.declareLegacyNamespace().\n *\n *\n * See the public goog.module proposal: http://goo.gl/Va1hin\n *\n * @param {string} name Namespace provided by this file in the form\n * \"goog.package.part\", is expected but not required.\n * @return {void}\n */\ngoog.module = function(name) {\n if (typeof name !== 'string' || !name ||\n name.search(goog.VALID_MODULE_RE_) == -1) {\n throw new Error('Invalid module identifier');\n }\n if (!goog.isInGoogModuleLoader_()) {\n throw new Error(\n 'Module ' + name + ' has been loaded incorrectly. Note, ' +\n 'modules cannot be loaded as normal scripts. They require some kind of ' +\n 'pre-processing step. You\\'re likely trying to load a module via a ' +\n 'script tag or as a part of a concatenated bundle without rewriting the ' +\n 'module. For more info see: ' +\n 'https://github.com/google/closure-library/wiki/goog.module:-an-ES6-module-like-alternative-to-goog.provide.');\n }\n if (goog.moduleLoaderState_.moduleName) {\n throw new Error('goog.module may only be called once per module.');\n }\n\n // Store the module name for the loader.\n goog.moduleLoaderState_.moduleName = name;\n if (!COMPILED) {\n // Ensure that the same namespace isn't provided twice.\n // A goog.module/goog.provide maps a goog.require to a specific file\n if (goog.isProvided_(name)) {\n throw new Error('Namespace \"' + name + '\" already declared.');\n }\n delete goog.implicitNamespaces_[name];\n }\n};\n\n\n/**\n * @param {string} name The module identifier.\n * @return {?} The module exports for an already loaded module or null.\n *\n * Note: This is not an alternative to goog.require, it does not\n * indicate a hard dependency, instead it is used to indicate\n * an optional dependency or to access the exports of a module\n * that has already been loaded.\n * @suppress {missingProvide}\n */\ngoog.module.get = function(name) {\n return goog.module.getInternal_(name);\n};\n\n\n/**\n * @param {string} name The module identifier.\n * @return {?} The module exports for an already loaded module or null.\n * @private\n */\ngoog.module.getInternal_ = function(name) {\n if (!COMPILED) {\n if (name in goog.loadedModules_) {\n return goog.loadedModules_[name].exports;\n } else if (!goog.implicitNamespaces_[name]) {\n var ns = goog.getObjectByName(name);\n return ns != null ? ns : null;\n }\n }\n return null;\n};\n\n\n/**\n * Types of modules the debug loader can load.\n * @enum {string}\n */\ngoog.ModuleType = {\n ES6: 'es6',\n GOOG: 'goog'\n};\n\n\n/**\n * @private {?{\n * moduleName: (string|undefined),\n * declareLegacyNamespace:boolean,\n * type: ?goog.ModuleType\n * }}\n */\ngoog.moduleLoaderState_ = null;\n\n\n/**\n * @private\n * @return {boolean} Whether a goog.module or an es6 module is currently being\n * initialized.\n */\ngoog.isInModuleLoader_ = function() {\n return goog.isInGoogModuleLoader_() || goog.isInEs6ModuleLoader_();\n};\n\n\n/**\n * @private\n * @return {boolean} Whether a goog.module is currently being initialized.\n */\ngoog.isInGoogModuleLoader_ = function() {\n return !!goog.moduleLoaderState_ &&\n goog.moduleLoaderState_.type == goog.ModuleType.GOOG;\n};\n\n\n/**\n * @private\n * @return {boolean} Whether an es6 module is currently being initialized.\n */\ngoog.isInEs6ModuleLoader_ = function() {\n var inLoader = !!goog.moduleLoaderState_ &&\n goog.moduleLoaderState_.type == goog.ModuleType.ES6;\n\n if (inLoader) {\n return true;\n }\n\n var jscomp = goog.global['$jscomp'];\n\n if (jscomp) {\n // jscomp may not have getCurrentModulePath if this is a compiled bundle\n // that has some of the runtime, but not all of it. This can happen if\n // optimizations are turned on so the unused runtime is removed but renaming\n // and Closure pass are off (so $jscomp is still named $jscomp and the\n // goog.provide/require calls still exist).\n if (typeof jscomp.getCurrentModulePath != 'function') {\n return false;\n }\n\n // Bundled ES6 module.\n return !!jscomp.getCurrentModulePath();\n }\n\n return false;\n};\n\n\n/**\n * Provide the module's exports as a globally accessible object under the\n * module's declared name. This is intended to ease migration to goog.module\n * for files that have existing usages.\n * @suppress {missingProvide}\n */\ngoog.module.declareLegacyNamespace = function() {\n if (!COMPILED && !goog.isInGoogModuleLoader_()) {\n throw new Error(\n 'goog.module.declareLegacyNamespace must be called from ' +\n 'within a goog.module');\n }\n if (!COMPILED && !goog.moduleLoaderState_.moduleName) {\n throw new Error(\n 'goog.module must be called prior to ' +\n 'goog.module.declareLegacyNamespace.');\n }\n goog.moduleLoaderState_.declareLegacyNamespace = true;\n};\n\n\n/**\n * Associates an ES6 module with a Closure module ID so that is available via\n * goog.require. The associated ID acts like a goog.module ID - it does not\n * create any global names, it is merely available via goog.require /\n * goog.module.get / goog.forwardDeclare / goog.requireType. goog.require and\n * goog.module.get will return the entire module as if it was import *'d. This\n * allows Closure files to reference ES6 modules for the sake of migration.\n *\n * @param {string} namespace\n * @suppress {missingProvide}\n */\ngoog.declareModuleId = function(namespace) {\n if (!COMPILED) {\n if (!goog.isInEs6ModuleLoader_()) {\n throw new Error(\n 'goog.declareModuleId may only be called from ' +\n 'within an ES6 module');\n }\n if (goog.moduleLoaderState_ && goog.moduleLoaderState_.moduleName) {\n throw new Error(\n 'goog.declareModuleId may only be called once per module.');\n }\n if (namespace in goog.loadedModules_) {\n throw new Error(\n 'Module with namespace \"' + namespace + '\" already exists.');\n }\n }\n if (goog.moduleLoaderState_) {\n // Not bundled - debug loading.\n goog.moduleLoaderState_.moduleName = namespace;\n } else {\n // Bundled - not debug loading, no module loader state.\n var jscomp = goog.global['$jscomp'];\n if (!jscomp || typeof jscomp.getCurrentModulePath != 'function') {\n throw new Error(\n 'Module with namespace \"' + namespace +\n '\" has been loaded incorrectly.');\n }\n var exports = jscomp.require(jscomp.getCurrentModulePath());\n goog.loadedModules_[namespace] = {\n exports: exports,\n type: goog.ModuleType.ES6,\n moduleId: namespace\n };\n }\n};\n\n\n/**\n * Marks that the current file should only be used for testing, and never for\n * live code in production.\n *\n * In the case of unit tests, the message may optionally be an exact namespace\n * for the test (e.g. 'goog.stringTest'). The linter will then ignore the extra\n * provide (if not explicitly defined in the code).\n *\n * @param {string=} opt_message Optional message to add to the error that's\n * raised when used in production code.\n */\ngoog.setTestOnly = function(opt_message) {\n if (goog.DISALLOW_TEST_ONLY_CODE) {\n opt_message = opt_message || '';\n throw new Error(\n 'Importing test-only code into non-debug environment' +\n (opt_message ? ': ' + opt_message : '.'));\n }\n};\n\n\n/**\n * Forward declares a symbol. This is an indication to the compiler that the\n * symbol may be used in the source yet is not required and may not be provided\n * in compilation.\n *\n * The most common usage of forward declaration is code that takes a type as a\n * function parameter but does not need to require it. By forward declaring\n * instead of requiring, no hard dependency is made, and (if not required\n * elsewhere) the namespace may never be required and thus, not be pulled\n * into the JavaScript binary. If it is required elsewhere, it will be type\n * checked as normal.\n *\n * Before using goog.forwardDeclare, please read the documentation at\n * https://github.com/google/closure-compiler/wiki/Bad-Type-Annotation to\n * understand the options and tradeoffs when working with forward declarations.\n *\n * @param {string} name The namespace to forward declare in the form of\n * \"goog.package.part\".\n * @deprecated See go/noforwarddeclaration, Use `goog.requireType` instead.\n */\ngoog.forwardDeclare = function(name) {};\n\n\n/**\n * Forward declare type information. Used to assign types to goog.global\n * referenced object that would otherwise result in unknown type references\n * and thus block property disambiguation.\n */\ngoog.forwardDeclare('Document');\ngoog.forwardDeclare('HTMLScriptElement');\ngoog.forwardDeclare('XMLHttpRequest');\n\n\nif (!COMPILED) {\n /**\n * Check if the given name has been goog.provided. This will return false for\n * names that are available only as implicit namespaces.\n * @param {string} name name of the object to look for.\n * @return {boolean} Whether the name has been provided.\n * @private\n */\n goog.isProvided_ = function(name) {\n return (name in goog.loadedModules_) ||\n (!goog.implicitNamespaces_[name] && goog.getObjectByName(name) != null);\n };\n\n /**\n * Namespaces implicitly defined by goog.provide. For example,\n * goog.provide('goog.events.Event') implicitly declares that 'goog' and\n * 'goog.events' must be namespaces.\n *\n * @type {!Object}\n * @private\n */\n goog.implicitNamespaces_ = {'goog.module': true};\n\n // NOTE: We add goog.module as an implicit namespace as goog.module is defined\n // here and because the existing module package has not been moved yet out of\n // the goog.module namespace. This satisifies both the debug loader and\n // ahead-of-time dependency management.\n}\n\n\n/**\n * Returns an object based on its fully qualified external name. The object\n * is not found if null or undefined. If you are using a compilation pass that\n * renames property names beware that using this function will not find renamed\n * properties.\n *\n * @param {string} name The fully qualified name.\n * @param {Object=} opt_obj The object within which to look; default is\n * |goog.global|.\n * @return {?} The value (object or primitive) or, if not found, null.\n */\ngoog.getObjectByName = function(name, opt_obj) {\n var parts = name.split('.');\n var cur = opt_obj || goog.global;\n for (var i = 0; i < parts.length; i++) {\n cur = cur[parts[i]];\n if (cur == null) {\n return null;\n }\n }\n return cur;\n};\n\n\n/**\n * Adds a dependency from a file to the files it requires.\n * @param {string} relPath The path to the js file.\n * @param {!Array} provides An array of strings with\n * the names of the objects this file provides.\n * @param {!Array} requires An array of strings with\n * the names of the objects this file requires.\n * @param {boolean|!Object=} opt_loadFlags Parameters indicating\n * how the file must be loaded. The boolean 'true' is equivalent\n * to {'module': 'goog'} for backwards-compatibility. Valid properties\n * and values include {'module': 'goog'} and {'lang': 'es6'}.\n */\ngoog.addDependency = function(relPath, provides, requires, opt_loadFlags) {\n if (!COMPILED && goog.DEPENDENCIES_ENABLED) {\n goog.debugLoader_.addDependency(relPath, provides, requires, opt_loadFlags);\n }\n};\n\n\n// NOTE(nnaze): The debug DOM loader was included in base.js as an original way\n// to do \"debug-mode\" development. The dependency system can sometimes be\n// confusing, as can the debug DOM loader's asynchronous nature.\n//\n// With the DOM loader, a call to goog.require() is not blocking -- the script\n// will not load until some point after the current script. If a namespace is\n// needed at runtime, it needs to be defined in a previous script, or loaded via\n// require() with its registered dependencies.\n//\n// User-defined namespaces may need their own deps file. For a reference on\n// creating a deps file, see:\n// Externally: https://developers.google.com/closure/library/docs/depswriter\n//\n// Because of legacy clients, the DOM loader can't be easily removed from\n// base.js. Work was done to make it disableable or replaceable for\n// different environments (DOM-less JavaScript interpreters like Rhino or V8,\n// for example). See bootstrap/ for more information.\n\n\n/**\n * @define {boolean} Whether to enable the debug loader.\n *\n * If enabled, a call to goog.require() will attempt to load the namespace by\n * appending a script tag to the DOM (if the namespace has been registered).\n *\n * If disabled, goog.require() will simply assert that the namespace has been\n * provided (and depend on the fact that some outside tool correctly ordered\n * the script).\n */\ngoog.ENABLE_DEBUG_LOADER = goog.define('goog.ENABLE_DEBUG_LOADER', true);\n\n\n/**\n * @param {string} msg\n * @private\n */\ngoog.logToConsole_ = function(msg) {\n if (goog.global.console) {\n goog.global.console['error'](msg);\n }\n};\n\n\n/**\n * Implements a system for the dynamic resolution of dependencies that works in\n * parallel with the BUILD system.\n *\n * Note that all calls to goog.require will be stripped by the compiler.\n *\n * @see goog.provide\n * @param {string} namespace Namespace (as was given in goog.provide,\n * goog.module, or goog.declareModuleId) in the form\n * \"goog.package.part\".\n * @return {?} If called within a goog.module or ES6 module file, the associated\n * namespace or module otherwise null.\n */\ngoog.require = function(namespace) {\n if (!COMPILED) {\n // Might need to lazy load on old IE.\n if (goog.ENABLE_DEBUG_LOADER) {\n goog.debugLoader_.requested(namespace);\n }\n\n // If the object already exists we do not need to do anything.\n if (goog.isProvided_(namespace)) {\n if (goog.isInModuleLoader_()) {\n return goog.module.getInternal_(namespace);\n }\n } else if (goog.ENABLE_DEBUG_LOADER) {\n var moduleLoaderState = goog.moduleLoaderState_;\n goog.moduleLoaderState_ = null;\n try {\n goog.debugLoader_.load_(namespace);\n } finally {\n goog.moduleLoaderState_ = moduleLoaderState;\n }\n }\n\n return null;\n }\n};\n\n\n/**\n * Requires a symbol for its type information. This is an indication to the\n * compiler that the symbol may appear in type annotations, yet it is not\n * referenced at runtime.\n *\n * When called within a goog.module or ES6 module file, the return value may be\n * assigned to or destructured into a variable, but it may not be otherwise used\n * in code outside of a type annotation.\n *\n * Note that all calls to goog.requireType will be stripped by the compiler.\n *\n * @param {string} namespace Namespace (as was given in goog.provide,\n * goog.module, or goog.declareModuleId) in the form\n * \"goog.package.part\".\n * @return {?}\n */\ngoog.requireType = function(namespace) {\n // Return an empty object so that single-level destructuring of the return\n // value doesn't crash at runtime when using the debug loader. Multi-level\n // destructuring isn't supported.\n return {};\n};\n\n\n/**\n * Path for included scripts.\n * @type {string}\n */\ngoog.basePath = '';\n\n\n/**\n * A hook for overriding the base path.\n * @type {string|undefined}\n */\ngoog.global.CLOSURE_BASE_PATH;\n\n\n/**\n * Whether to attempt to load Closure's deps file. By default, when uncompiled,\n * deps files will attempt to be loaded.\n * @type {boolean|undefined}\n */\ngoog.global.CLOSURE_NO_DEPS;\n\n\n/**\n * A function to import a single script. This is meant to be overridden when\n * Closure is being run in non-HTML contexts, such as web workers. It's defined\n * in the global scope so that it can be set before base.js is loaded, which\n * allows deps.js to be imported properly.\n *\n * The first parameter the script source, which is a relative URI. The second,\n * optional parameter is the script contents, in the event the script needed\n * transformation. It should return true if the script was imported, false\n * otherwise.\n * @type {(function(string, string=): boolean)|undefined}\n */\ngoog.global.CLOSURE_IMPORT_SCRIPT;\n\n\n/**\n * Null function used for default values of callbacks, etc.\n * @return {void} Nothing.\n * @deprecated use '()=>{}' or 'function(){}' instead.\n */\ngoog.nullFunction = function() {};\n\n\n/**\n * When defining a class Foo with an abstract method bar(), you can do:\n * Foo.prototype.bar = goog.abstractMethod\n *\n * Now if a subclass of Foo fails to override bar(), an error will be thrown\n * when bar() is invoked.\n *\n * @type {!Function}\n * @throws {Error} when invoked to indicate the method should be overridden.\n * @deprecated Use \"@abstract\" annotation instead of goog.abstractMethod in new\n * code. See\n * https://github.com/google/closure-compiler/wiki/@abstract-classes-and-methods\n */\ngoog.abstractMethod = function() {\n throw new Error('unimplemented abstract method');\n};\n\n\n/**\n * Adds a `getInstance` static method that always returns the same\n * instance object.\n * @param {!Function} ctor The constructor for the class to add the static\n * method to.\n * @suppress {missingProperties} 'instance_' isn't a property on 'Function'\n * but we don't have a better type to use here.\n */\ngoog.addSingletonGetter = function(ctor) {\n // instance_ is immediately set to prevent issues with sealed constructors\n // such as are encountered when a constructor is returned as the export object\n // of a goog.module in unoptimized code.\n // Delcare type to avoid conformance violations that ctor.instance_ is unknown\n /** @type {undefined|!Object} @suppress {underscore} */\n ctor.instance_ = undefined;\n ctor.getInstance = function() {\n if (ctor.instance_) {\n return ctor.instance_;\n }\n if (goog.DEBUG) {\n // NOTE: JSCompiler can't optimize away Array#push.\n goog.instantiatedSingletons_[goog.instantiatedSingletons_.length] = ctor;\n }\n // Cast to avoid conformance violations that ctor.instance_ is unknown\n return /** @type {!Object|undefined} */ (ctor.instance_) = new ctor;\n };\n};\n\n\n/**\n * All singleton classes that have been instantiated, for testing. Don't read\n * it directly, use the `goog.testing.singleton` module. The compiler\n * removes this variable if unused.\n * @type {!Array}\n * @private\n */\ngoog.instantiatedSingletons_ = [];\n\n\n/**\n * @define {boolean} Whether to load goog.modules using `eval` when using\n * the debug loader. This provides a better debugging experience as the\n * source is unmodified and can be edited using Chrome Workspaces or similar.\n * However in some environments the use of `eval` is banned\n * so we provide an alternative.\n */\ngoog.LOAD_MODULE_USING_EVAL = goog.define('goog.LOAD_MODULE_USING_EVAL', true);\n\n\n/**\n * @define {boolean} Whether the exports of goog.modules should be sealed when\n * possible.\n */\ngoog.SEAL_MODULE_EXPORTS = goog.define('goog.SEAL_MODULE_EXPORTS', goog.DEBUG);\n\n\n/**\n * The registry of initialized modules:\n * The module identifier or path to module exports map.\n * @private @const {!Object}\n */\ngoog.loadedModules_ = {};\n\n\n/**\n * True if the debug loader enabled and used.\n * @const {boolean}\n */\ngoog.DEPENDENCIES_ENABLED = !COMPILED && goog.ENABLE_DEBUG_LOADER;\n\n\n/**\n * @define {string} How to decide whether to transpile. Valid values\n * are 'always', 'never', and 'detect'. The default ('detect') is to\n * use feature detection to determine which language levels need\n * transpilation.\n */\n// NOTE(sdh): we could expand this to accept a language level to bypass\n// detection: e.g. goog.TRANSPILE == 'es5' would transpile ES6 files but\n// would leave ES3 and ES5 files alone.\ngoog.TRANSPILE = goog.define('goog.TRANSPILE', 'detect');\n\n/**\n * @define {boolean} If true assume that ES modules have already been\n * transpiled by the jscompiler (in the same way that transpile.js would\n * transpile them - to jscomp modules). Useful only for servers that wish to use\n * the debug loader and transpile server side. Thus this is only respected if\n * goog.TRANSPILE is \"never\".\n */\ngoog.ASSUME_ES_MODULES_TRANSPILED =\n goog.define('goog.ASSUME_ES_MODULES_TRANSPILED', false);\n\n\n/**\n * @define {string} If a file needs to be transpiled what the output language\n * should be. By default this is the highest language level this file detects\n * the current environment supports. Generally this flag should not be set, but\n * it could be useful to override. Example: If the current environment supports\n * ES6 then by default ES7+ files will be transpiled to ES6, unless this is\n * overridden.\n *\n * Valid values include: es3, es5, es6, es7, and es8. Anything not recognized\n * is treated as es3.\n *\n * Note that setting this value does not force transpilation. Just if\n * transpilation occurs this will be the output. So this is most useful when\n * goog.TRANSPILE is set to 'always' and then forcing the language level to be\n * something lower than what the environment detects.\n */\ngoog.TRANSPILE_TO_LANGUAGE = goog.define('goog.TRANSPILE_TO_LANGUAGE', '');\n\n\n/**\n * @define {string} Path to the transpiler. Executing the script at this\n * path (relative to base.js) should define a function $jscomp.transpile.\n */\ngoog.TRANSPILER = goog.define('goog.TRANSPILER', 'transpile.js');\n\n\n/**\n * @define {string} Trusted Types policy name. If non-empty then Closure will\n * use Trusted Types.\n */\ngoog.TRUSTED_TYPES_POLICY_NAME =\n goog.define('goog.TRUSTED_TYPES_POLICY_NAME', 'goog');\n\n\n/**\n * @package {?boolean}\n * Visible for testing.\n */\ngoog.hasBadLetScoping = null;\n\n\n/**\n * @param {function(?):?|string} moduleDef The module definition.\n */\ngoog.loadModule = function(moduleDef) {\n // NOTE: we allow function definitions to be either in the from\n // of a string to eval (which keeps the original source intact) or\n // in a eval forbidden environment (CSP) we allow a function definition\n // which in its body must call `goog.module`, and return the exports\n // of the module.\n var previousState = goog.moduleLoaderState_;\n try {\n goog.moduleLoaderState_ = {\n moduleName: '',\n declareLegacyNamespace: false,\n type: goog.ModuleType.GOOG\n };\n var origExports = {};\n var exports = origExports;\n if (typeof moduleDef === 'function') {\n exports = moduleDef.call(undefined, exports);\n } else if (typeof moduleDef === 'string') {\n exports = goog.loadModuleFromSource_.call(undefined, exports, moduleDef);\n } else {\n throw new Error('Invalid module definition');\n }\n\n var moduleName = goog.moduleLoaderState_.moduleName;\n if (typeof moduleName === 'string' && moduleName) {\n // Don't seal legacy namespaces as they may be used as a parent of\n // another namespace\n if (goog.moduleLoaderState_.declareLegacyNamespace) {\n // Whether exports was overwritten via default export assignment.\n // This is important for legacy namespaces as it dictates whether\n // previously a previously loaded implicit namespace should be clobbered\n // or not.\n var isDefaultExport = origExports !== exports;\n goog.constructNamespace_(moduleName, exports, isDefaultExport);\n } else if (\n goog.SEAL_MODULE_EXPORTS && Object.seal &&\n typeof exports == 'object' && exports != null) {\n Object.seal(exports);\n }\n\n var data = {\n exports: exports,\n type: goog.ModuleType.GOOG,\n moduleId: goog.moduleLoaderState_.moduleName\n };\n goog.loadedModules_[moduleName] = data;\n } else {\n throw new Error('Invalid module name \\\"' + moduleName + '\\\"');\n }\n } finally {\n goog.moduleLoaderState_ = previousState;\n }\n};\n\n\n/**\n * @private @const\n */\ngoog.loadModuleFromSource_ =\n /** @type {function(!Object, string):?} */ (function(exports) {\n // NOTE: we avoid declaring parameters or local variables here to avoid\n // masking globals or leaking values into the module definition.\n 'use strict';\n eval(goog.CLOSURE_EVAL_PREFILTER_.createScript(arguments[1]));\n return exports;\n });\n\n\n/**\n * Normalize a file path by removing redundant \"..\" and extraneous \".\" file\n * path components.\n * @param {string} path\n * @return {string}\n * @private\n */\ngoog.normalizePath_ = function(path) {\n var components = path.split('/');\n var i = 0;\n while (i < components.length) {\n if (components[i] == '.') {\n components.splice(i, 1);\n } else if (\n i && components[i] == '..' && components[i - 1] &&\n components[i - 1] != '..') {\n components.splice(--i, 2);\n } else {\n i++;\n }\n }\n return components.join('/');\n};\n\n\n/**\n * Provides a hook for loading a file when using Closure's goog.require() API\n * with goog.modules. In particular this hook is provided to support Node.js.\n *\n * @type {(function(string):string)|undefined}\n */\ngoog.global.CLOSURE_LOAD_FILE_SYNC;\n\n\n/**\n * Loads file by synchronous XHR. Should not be used in production environments.\n * @param {string} src Source URL.\n * @return {?string} File contents, or null if load failed.\n * @private\n */\ngoog.loadFileSync_ = function(src) {\n if (goog.global.CLOSURE_LOAD_FILE_SYNC) {\n return goog.global.CLOSURE_LOAD_FILE_SYNC(src);\n } else {\n try {\n /** @type {XMLHttpRequest} */\n var xhr = new goog.global['XMLHttpRequest']();\n xhr.open('get', src, false);\n xhr.send();\n // NOTE: Successful http: requests have a status of 200, but successful\n // file: requests may have a status of zero. Any other status, or a\n // thrown exception (particularly in case of file: requests) indicates\n // some sort of error, which we treat as a missing or unavailable file.\n return xhr.status == 0 || xhr.status == 200 ? xhr.responseText : null;\n } catch (err) {\n // No need to rethrow or log, since errors should show up on their own.\n return null;\n }\n }\n};\n\n\n/**\n * Lazily retrieves the transpiler and applies it to the source.\n * @param {string} code JS code.\n * @param {string} path Path to the code.\n * @param {string} target Language level output.\n * @return {string} The transpiled code.\n * @private\n */\ngoog.transpile_ = function(code, path, target) {\n var jscomp = goog.global['$jscomp'];\n if (!jscomp) {\n goog.global['$jscomp'] = jscomp = {};\n }\n var transpile = jscomp.transpile;\n if (!transpile) {\n var transpilerPath = goog.basePath + goog.TRANSPILER;\n var transpilerCode = goog.loadFileSync_(transpilerPath);\n if (transpilerCode) {\n // This must be executed synchronously, since by the time we know we\n // need it, we're about to load and write the ES6 code synchronously,\n // so a normal script-tag load will be too slow. Wrapped in a function\n // so that code is eval'd in the global scope.\n (function() {\n (0, eval)(transpilerCode + '\\n//# sourceURL=' + transpilerPath);\n }).call(goog.global);\n // Even though the transpiler is optional, if $gwtExport is found, it's\n // a sign the transpiler was loaded and the $jscomp.transpile *should*\n // be there.\n if (goog.global['$gwtExport'] && goog.global['$gwtExport']['$jscomp'] &&\n !goog.global['$gwtExport']['$jscomp']['transpile']) {\n throw new Error(\n 'The transpiler did not properly export the \"transpile\" ' +\n 'method. $gwtExport: ' + JSON.stringify(goog.global['$gwtExport']));\n }\n // transpile.js only exports a single $jscomp function, transpile. We\n // grab just that and add it to the existing definition of $jscomp which\n // contains the polyfills.\n goog.global['$jscomp'].transpile =\n goog.global['$gwtExport']['$jscomp']['transpile'];\n jscomp = goog.global['$jscomp'];\n transpile = jscomp.transpile;\n }\n }\n if (!transpile) {\n // The transpiler is an optional component. If it's not available then\n // replace it with a pass-through function that simply logs.\n var suffix = ' requires transpilation but no transpiler was found.';\n transpile = jscomp.transpile = function(code, path) {\n // TODO(sdh): figure out some way to get this error to show up\n // in test results, noting that the failure may occur in many\n // different ways, including in loadModule() before the test\n // runner even comes up.\n goog.logToConsole_(path + suffix);\n return code;\n };\n }\n // Note: any transpilation errors/warnings will be logged to the console.\n return transpile(code, path, target);\n};\n\n//==============================================================================\n// Language Enhancements\n//==============================================================================\n\n\n/**\n * This is a \"fixed\" version of the typeof operator. It differs from the typeof\n * operator in such a way that null returns 'null' and arrays return 'array'.\n * @param {?} value The value to get the type of.\n * @return {string} The name of the type.\n */\ngoog.typeOf = function(value) {\n var s = typeof value;\n\n if (s != 'object') {\n return s;\n }\n\n if (!value) {\n return 'null';\n }\n\n if (Array.isArray(value)) {\n return 'array';\n }\n return s;\n};\n\n\n/**\n * Returns true if the object looks like an array. To qualify as array like\n * the value needs to be either a NodeList or an object with a Number length\n * property. Note that for this function neither strings nor functions are\n * considered \"array-like\".\n *\n * @param {?} val Variable to test.\n * @return {boolean} Whether variable is an array.\n */\ngoog.isArrayLike = function(val) {\n var type = goog.typeOf(val);\n // We do not use goog.isObject here in order to exclude function values.\n return type == 'array' || type == 'object' && typeof val.length == 'number';\n};\n\n\n/**\n * Returns true if the object looks like a Date. To qualify as Date-like the\n * value needs to be an object and have a getFullYear() function.\n * @param {?} val Variable to test.\n * @return {boolean} Whether variable is a like a Date.\n */\ngoog.isDateLike = function(val) {\n return goog.isObject(val) && typeof val.getFullYear == 'function';\n};\n\n\n/**\n * Returns true if the specified value is an object. This includes arrays and\n * functions.\n * @param {?} val Variable to test.\n * @return {boolean} Whether variable is an object.\n */\ngoog.isObject = function(val) {\n var type = typeof val;\n return type == 'object' && val != null || type == 'function';\n // return Object(val) === val also works, but is slower, especially if val is\n // not an object.\n};\n\n\n/**\n * Gets a unique ID for an object. This mutates the object so that further calls\n * with the same object as a parameter returns the same value. The unique ID is\n * guaranteed to be unique across the current session amongst objects that are\n * passed into `getUid`. There is no guarantee that the ID is unique or\n * consistent across sessions. It is unsafe to generate unique ID for function\n * prototypes.\n *\n * @param {Object} obj The object to get the unique ID for.\n * @return {number} The unique ID for the object.\n */\ngoog.getUid = function(obj) {\n // TODO(arv): Make the type stricter, do not accept null.\n return Object.prototype.hasOwnProperty.call(obj, goog.UID_PROPERTY_) &&\n obj[goog.UID_PROPERTY_] ||\n (obj[goog.UID_PROPERTY_] = ++goog.uidCounter_);\n};\n\n\n/**\n * Whether the given object is already assigned a unique ID.\n *\n * This does not modify the object.\n *\n * @param {!Object} obj The object to check.\n * @return {boolean} Whether there is an assigned unique id for the object.\n */\ngoog.hasUid = function(obj) {\n return !!obj[goog.UID_PROPERTY_];\n};\n\n\n/**\n * Removes the unique ID from an object. This is useful if the object was\n * previously mutated using `goog.getUid` in which case the mutation is\n * undone.\n * @param {Object} obj The object to remove the unique ID field from.\n */\ngoog.removeUid = function(obj) {\n // TODO(arv): Make the type stricter, do not accept null.\n\n // In IE, DOM nodes are not instances of Object and throw an exception if we\n // try to delete. Instead we try to use removeAttribute.\n if (obj !== null && 'removeAttribute' in obj) {\n obj.removeAttribute(goog.UID_PROPERTY_);\n }\n\n try {\n delete obj[goog.UID_PROPERTY_];\n } catch (ex) {\n }\n};\n\n\n/**\n * Name for unique ID property. Initialized in a way to help avoid collisions\n * with other closure JavaScript on the same page.\n * @type {string}\n * @private\n */\ngoog.UID_PROPERTY_ = 'closure_uid_' + ((Math.random() * 1e9) >>> 0);\n\n\n/**\n * Counter for UID.\n * @type {number}\n * @private\n */\ngoog.uidCounter_ = 0;\n\n\n/**\n * Clones a value. The input may be an Object, Array, or basic type. Objects and\n * arrays will be cloned recursively.\n *\n * WARNINGS:\n * goog.cloneObject does not detect reference loops. Objects that\n * refer to themselves will cause infinite recursion.\n *\n * goog.cloneObject is unaware of unique identifiers, and copies\n * UIDs created by getUid into cloned results.\n *\n * @param {*} obj The value to clone.\n * @return {*} A clone of the input value.\n * @deprecated goog.cloneObject is unsafe. Prefer the goog.object methods.\n */\ngoog.cloneObject = function(obj) {\n var type = goog.typeOf(obj);\n if (type == 'object' || type == 'array') {\n if (typeof obj.clone === 'function') {\n return obj.clone();\n }\n if (typeof Map !== 'undefined' && obj instanceof Map) {\n return new Map(obj);\n } else if (typeof Set !== 'undefined' && obj instanceof Set) {\n return new Set(obj);\n }\n var clone = type == 'array' ? [] : {};\n for (var key in obj) {\n clone[key] = goog.cloneObject(obj[key]);\n }\n return clone;\n }\n\n return obj;\n};\n\n\n/**\n * A native implementation of goog.bind.\n * @param {?function(this:T, ...)} fn A function to partially apply.\n * @param {T} selfObj Specifies the object which this should point to when the\n * function is run.\n * @param {...*} var_args Additional arguments that are partially applied to the\n * function.\n * @return {!Function} A partially-applied form of the function goog.bind() was\n * invoked as a method of.\n * @template T\n * @private\n */\ngoog.bindNative_ = function(fn, selfObj, var_args) {\n return /** @type {!Function} */ (fn.call.apply(fn.bind, arguments));\n};\n\n\n/**\n * A pure-JS implementation of goog.bind.\n * @param {?function(this:T, ...)} fn A function to partially apply.\n * @param {T} selfObj Specifies the object which this should point to when the\n * function is run.\n * @param {...*} var_args Additional arguments that are partially applied to the\n * function.\n * @return {!Function} A partially-applied form of the function goog.bind() was\n * invoked as a method of.\n * @template T\n * @private\n */\ngoog.bindJs_ = function(fn, selfObj, var_args) {\n if (!fn) {\n throw new Error();\n }\n\n if (arguments.length > 2) {\n var boundArgs = Array.prototype.slice.call(arguments, 2);\n return function() {\n // Prepend the bound arguments to the current arguments.\n var newArgs = Array.prototype.slice.call(arguments);\n Array.prototype.unshift.apply(newArgs, boundArgs);\n return fn.apply(selfObj, newArgs);\n };\n\n } else {\n return function() {\n return fn.apply(selfObj, arguments);\n };\n }\n};\n\n\n/**\n * Partially applies this function to a particular 'this object' and zero or\n * more arguments. The result is a new function with some arguments of the first\n * function pre-filled and the value of this 'pre-specified'.\n *\n * Remaining arguments specified at call-time are appended to the pre-specified\n * ones.\n *\n * Also see: {@link #partial}.\n *\n * Usage:\n * 
var barMethBound = goog.bind(myFunction, myObj, 'arg1', 'arg2');\n * barMethBound('arg3', 'arg4');
\n *\n * @param {?function(this:T, ...)} fn A function to partially apply.\n * @param {T} selfObj Specifies the object which this should point to when the\n * function is run.\n * @param {...*} var_args Additional arguments that are partially applied to the\n * function.\n * @return {!Function} A partially-applied form of the function goog.bind() was\n * invoked as a method of.\n * @template T\n * @suppress {deprecated} See above.\n * @deprecated use `=> {}` or Function.prototype.bind instead.\n */\ngoog.bind = function(fn, selfObj, var_args) {\n // TODO(nicksantos): narrow the type signature.\n if (Function.prototype.bind &&\n // NOTE(nicksantos): Somebody pulled base.js into the default Chrome\n // extension environment. This means that for Chrome extensions, they get\n // the implementation of Function.prototype.bind that calls goog.bind\n // instead of the native one. Even worse, we don't want to introduce a\n // circular dependency between goog.bind and Function.prototype.bind, so\n // we have to hack this to make sure it works correctly.\n Function.prototype.bind.toString().indexOf('native code') != -1) {\n goog.bind = goog.bindNative_;\n } else {\n goog.bind = goog.bindJs_;\n }\n return goog.bind.apply(null, arguments);\n};\n\n\n/**\n * Like goog.bind(), except that a 'this object' is not required. Useful when\n * the target function is already bound.\n *\n * Usage:\n * var g = goog.partial(f, arg1, arg2);\n * g(arg3, arg4);\n *\n * @param {Function} fn A function to partially apply.\n * @param {...*} var_args Additional arguments that are partially applied to fn.\n * @return {!Function} A partially-applied form of the function goog.partial()\n * was invoked as a method of.\n */\ngoog.partial = function(fn, var_args) {\n var args = Array.prototype.slice.call(arguments, 1);\n return function() {\n // Clone the array (with slice()) and append additional arguments\n // to the existing arguments.\n var newArgs = args.slice();\n newArgs.push.apply(newArgs, arguments);\n return fn.apply(/** @type {?} */ (this), newArgs);\n };\n};\n\n\n/**\n * Copies all the members of a source object to a target object. This method\n * does not work on all browsers for all objects that contain keys such as\n * toString or hasOwnProperty. Use goog.object.extend for this purpose.\n *\n * NOTE: Some have advocated for the use of goog.mixin to setup classes\n * with multiple inheritence (traits, mixins, etc). However, as it simply\n * uses \"for in\", this is not compatible with ES6 classes whose methods are\n * non-enumerable. Changing this, would break cases where non-enumerable\n * properties are not expected.\n *\n * @param {Object} target Target.\n * @param {Object} source Source.\n * @deprecated Prefer Object.assign\n */\ngoog.mixin = function(target, source) {\n for (var x in source) {\n target[x] = source[x];\n }\n\n // For IE7 or lower, the for-in-loop does not contain any properties that are\n // not enumerable on the prototype object (for example, isPrototypeOf from\n // Object.prototype) but also it will not include 'replace' on objects that\n // extend String and change 'replace' (not that it is common for anyone to\n // extend anything except Object).\n};\n\n\n/**\n * @return {number} An integer value representing the number of milliseconds\n * between midnight, January 1, 1970 and the current time.\n * @deprecated Use Date.now\n */\ngoog.now = function() {\n return Date.now();\n};\n\n\n/**\n * Evals JavaScript in the global scope.\n *\n * Throws an exception if neither execScript or eval is defined.\n * @param {string|!TrustedScript} script JavaScript string.\n */\ngoog.globalEval = function(script) {\n (0, eval)(script);\n};\n\n\n/**\n * Optional map of CSS class names to obfuscated names used with\n * goog.getCssName().\n * @private {!Object|undefined}\n * @see goog.setCssNameMapping\n */\ngoog.cssNameMapping_;\n\n\n/**\n * Optional obfuscation style for CSS class names. Should be set to either\n * 'BY_WHOLE' or 'BY_PART' if defined.\n * @type {string|undefined}\n * @private\n * @see goog.setCssNameMapping\n */\ngoog.cssNameMappingStyle_;\n\n\n\n/**\n * A hook for modifying the default behavior goog.getCssName. The function\n * if present, will receive the standard output of the goog.getCssName as\n * its input.\n *\n * @type {(function(string):string)|undefined}\n */\ngoog.global.CLOSURE_CSS_NAME_MAP_FN;\n\n\n/**\n * Handles strings that are intended to be used as CSS class names.\n *\n * This function works in tandem with @see goog.setCssNameMapping.\n *\n * Without any mapping set, the arguments are simple joined with a hyphen and\n * passed through unaltered.\n *\n * When there is a mapping, there are two possible styles in which these\n * mappings are used. In the BY_PART style, each part (i.e. in between hyphens)\n * of the passed in css name is rewritten according to the map. In the BY_WHOLE\n * style, the full css name is looked up in the map directly. If a rewrite is\n * not specified by the map, the compiler will output a warning.\n *\n * When the mapping is passed to the compiler, it will replace calls to\n * goog.getCssName with the strings from the mapping, e.g.\n * var x = goog.getCssName('foo');\n * var y = goog.getCssName(this.baseClass, 'active');\n * becomes:\n * var x = 'foo';\n * var y = this.baseClass + '-active';\n *\n * If one argument is passed it will be processed, if two are passed only the\n * modifier will be processed, as it is assumed the first argument was generated\n * as a result of calling goog.getCssName.\n *\n * @param {string} className The class name.\n * @param {string=} opt_modifier A modifier to be appended to the class name.\n * @return {string} The class name or the concatenation of the class name and\n * the modifier.\n */\ngoog.getCssName = function(className, opt_modifier) {\n // String() is used for compatibility with compiled soy where the passed\n // className can be non-string objects.\n if (String(className).charAt(0) == '.') {\n throw new Error(\n 'className passed in goog.getCssName must not start with \".\".' +\n ' You passed: ' + className);\n }\n\n var getMapping = function(cssName) {\n return goog.cssNameMapping_[cssName] || cssName;\n };\n\n var renameByParts = function(cssName) {\n // Remap all the parts individually.\n var parts = cssName.split('-');\n var mapped = [];\n for (var i = 0; i < parts.length; i++) {\n mapped.push(getMapping(parts[i]));\n }\n return mapped.join('-');\n };\n\n var rename;\n if (goog.cssNameMapping_) {\n rename =\n goog.cssNameMappingStyle_ == 'BY_WHOLE' ? getMapping : renameByParts;\n } else {\n rename = function(a) {\n return a;\n };\n }\n\n var result =\n opt_modifier ? className + '-' + rename(opt_modifier) : rename(className);\n\n // The special CLOSURE_CSS_NAME_MAP_FN allows users to specify further\n // processing of the class name.\n if (goog.global.CLOSURE_CSS_NAME_MAP_FN) {\n return goog.global.CLOSURE_CSS_NAME_MAP_FN(result);\n }\n\n return result;\n};\n\n\n/**\n * Sets the map to check when returning a value from goog.getCssName(). Example:\n * 
\n * goog.setCssNameMapping({\n *   \"goog\": \"a\",\n *   \"disabled\": \"b\",\n * });\n *\n * var x = goog.getCssName('goog');\n * // The following evaluates to: \"a a-b\".\n * goog.getCssName('goog') + ' ' + goog.getCssName(x, 'disabled')\n *
\n * When declared as a map of string literals to string literals, the JSCompiler\n * will replace all calls to goog.getCssName() using the supplied map if the\n * --process_closure_primitives flag is set.\n *\n * @param {!Object} mapping A map of strings to strings where keys are possible\n * arguments to goog.getCssName() and values are the corresponding values\n * that should be returned.\n * @param {string=} opt_style The style of css name mapping. There are two valid\n * options: 'BY_PART', and 'BY_WHOLE'.\n * @see goog.getCssName for a description.\n */\ngoog.setCssNameMapping = function(mapping, opt_style) {\n goog.cssNameMapping_ = mapping;\n goog.cssNameMappingStyle_ = opt_style;\n};\n\n\n/**\n * To use CSS renaming in compiled mode, one of the input files should have a\n * call to goog.setCssNameMapping() with an object literal that the JSCompiler\n * can extract and use to replace all calls to goog.getCssName(). In uncompiled\n * mode, JavaScript code should be loaded before this base.js file that declares\n * a global variable, CLOSURE_CSS_NAME_MAPPING, which is used below. This is\n * to ensure that the mapping is loaded before any calls to goog.getCssName()\n * are made in uncompiled mode.\n *\n * A hook for overriding the CSS name mapping.\n * @type {!Object|undefined}\n */\ngoog.global.CLOSURE_CSS_NAME_MAPPING;\n\n\nif (!COMPILED && goog.global.CLOSURE_CSS_NAME_MAPPING) {\n // This does not call goog.setCssNameMapping() because the JSCompiler\n // requires that goog.setCssNameMapping() be called with an object literal.\n goog.cssNameMapping_ = goog.global.CLOSURE_CSS_NAME_MAPPING;\n}\n\n\n/**\n * Gets a localized message.\n *\n * This function is a compiler primitive. If you give the compiler a localized\n * message bundle, it will replace the string at compile-time with a localized\n * version, and expand goog.getMsg call to a concatenated string.\n *\n * Messages must be initialized in the form:\n * \n * var MSG_NAME = goog.getMsg('Hello {$placeholder}', {'placeholder': 'world'});\n * \n *\n * This function produces a string which should be treated as plain text. Use\n * {@link goog.html.SafeHtmlFormatter} in conjunction with goog.getMsg to\n * produce SafeHtml.\n *\n * @param {string} str Translatable string, places holders in the form {$foo}.\n * @param {Object=} opt_values Maps place holder name to value.\n * @param {{html: (boolean|undefined),\n * unescapeHtmlEntities: (boolean|undefined)}=} opt_options Options:\n * html: Escape '<' in str to '<'. Used by Closure Templates where the\n * generated code size and performance is critical which is why {@link\n * goog.html.SafeHtmlFormatter} is not used. The value must be literal true\n * or false.\n * unescapeHtmlEntities: Unescape common html entities: >, <, ',\n * " and &. Used for messages not in HTML context, such as with\n * `textContent` property.\n * @return {string} message with placeholders filled.\n */\ngoog.getMsg = function(str, opt_values, opt_options) {\n if (opt_options && opt_options.html) {\n // Note that '&' is not replaced because the translation can contain HTML\n // entities.\n str = str.replace(/')\n .replace(/'/g, '\\'')\n .replace(/"/g, '\"')\n .replace(/&/g, '&');\n }\n if (opt_values) {\n str = str.replace(/\\{\\$([^}]+)}/g, function(match, key) {\n return (opt_values != null && key in opt_values) ? opt_values[key] :\n match;\n });\n }\n return str;\n};\n\n\n/**\n * Gets a localized message. If the message does not have a translation, gives a\n * fallback message.\n *\n * This is useful when introducing a new message that has not yet been\n * translated into all languages.\n *\n * This function is a compiler primitive. Must be used in the form:\n * var x = goog.getMsgWithFallback(MSG_A, MSG_B);\n * where MSG_A and MSG_B were initialized with goog.getMsg.\n *\n * @param {string} a The preferred message.\n * @param {string} b The fallback message.\n * @return {string} The best translated message.\n */\ngoog.getMsgWithFallback = function(a, b) {\n return a;\n};\n\n\n/**\n * Exposes an unobfuscated global namespace path for the given object.\n * Note that fields of the exported object *will* be obfuscated, unless they are\n * exported in turn via this function or goog.exportProperty.\n *\n * Also handy for making public items that are defined in anonymous closures.\n *\n * ex. goog.exportSymbol('public.path.Foo', Foo);\n *\n * ex. goog.exportSymbol('public.path.Foo.staticFunction', Foo.staticFunction);\n * public.path.Foo.staticFunction();\n *\n * ex. goog.exportSymbol('public.path.Foo.prototype.myMethod',\n * Foo.prototype.myMethod);\n * new public.path.Foo().myMethod();\n *\n * @param {string} publicPath Unobfuscated name to export.\n * @param {*} object Object the name should point to.\n * @param {?Object=} objectToExportTo The object to add the path to; default\n * is goog.global.\n */\ngoog.exportSymbol = function(publicPath, object, objectToExportTo) {\n goog.exportPath_(\n publicPath, object, /* overwriteImplicit= */ true, objectToExportTo);\n};\n\n\n/**\n * Exports a property unobfuscated into the object's namespace.\n * ex. goog.exportProperty(Foo, 'staticFunction', Foo.staticFunction);\n * ex. goog.exportProperty(Foo.prototype, 'myMethod', Foo.prototype.myMethod);\n * @param {Object} object Object whose static property is being exported.\n * @param {string} publicName Unobfuscated name to export.\n * @param {*} symbol Object the name should point to.\n */\ngoog.exportProperty = function(object, publicName, symbol) {\n object[publicName] = symbol;\n};\n\n\n/**\n * Inherit the prototype methods from one constructor into another.\n *\n * Usage:\n * 
\n * function ParentClass(a, b) { }\n * ParentClass.prototype.foo = function(a) { };\n *\n * function ChildClass(a, b, c) {\n *   ChildClass.base(this, 'constructor', a, b);\n * }\n * goog.inherits(ChildClass, ParentClass);\n *\n * var child = new ChildClass('a', 'b', 'see');\n * child.foo(); // This works.\n *
\n *\n * @param {!Function} childCtor Child class.\n * @param {!Function} parentCtor Parent class.\n * @suppress {strictMissingProperties} superClass_ and base is not defined on\n * Function.\n * @deprecated Use ECMAScript class syntax instead.\n */\ngoog.inherits = function(childCtor, parentCtor) {\n /** @constructor */\n function tempCtor() {}\n tempCtor.prototype = parentCtor.prototype;\n childCtor.superClass_ = parentCtor.prototype;\n childCtor.prototype = new tempCtor();\n /** @override */\n childCtor.prototype.constructor = childCtor;\n\n /**\n * Calls superclass constructor/method.\n *\n * This function is only available if you use goog.inherits to\n * express inheritance relationships between classes.\n *\n * NOTE: This is a replacement for goog.base and for superClass_\n * property defined in childCtor.\n *\n * @param {!Object} me Should always be \"this\".\n * @param {string} methodName The method name to call. Calling\n * superclass constructor can be done with the special string\n * 'constructor'.\n * @param {...*} var_args The arguments to pass to superclass\n * method/constructor.\n * @return {*} The return value of the superclass method/constructor.\n */\n childCtor.base = function(me, methodName, var_args) {\n // Copying using loop to avoid deop due to passing arguments object to\n // function. This is faster in many JS engines as of late 2014.\n var args = new Array(arguments.length - 2);\n for (var i = 2; i < arguments.length; i++) {\n args[i - 2] = arguments[i];\n }\n return parentCtor.prototype[methodName].apply(me, args);\n };\n};\n\n\n/**\n * Allow for aliasing within scope functions. This function exists for\n * uncompiled code - in compiled code the calls will be inlined and the aliases\n * applied. In uncompiled code the function is simply run since the aliases as\n * written are valid JavaScript.\n *\n *\n * @param {function()} fn Function to call. This function can contain aliases\n * to namespaces (e.g. \"var dom = goog.dom\") or classes\n * (e.g. \"var Timer = goog.Timer\").\n * @deprecated Use goog.module instead.\n */\ngoog.scope = function(fn) {\n if (goog.isInModuleLoader_()) {\n throw new Error('goog.scope is not supported within a module.');\n }\n fn.call(goog.global);\n};\n\n\n/*\n * To support uncompiled, strict mode bundles that use eval to divide source\n * like so:\n * eval('someSource;//# sourceUrl sourcefile.js');\n * We need to export the globally defined symbols \"goog\" and \"COMPILED\".\n * Exporting \"goog\" breaks the compiler optimizations, so we required that\n * be defined externally.\n * NOTE: We don't use goog.exportSymbol here because we don't want to trigger\n * extern generation when that compiler option is enabled.\n */\nif (!COMPILED) {\n goog.global['COMPILED'] = COMPILED;\n}\n\n\n//==============================================================================\n// goog.defineClass implementation\n//==============================================================================\n\n\n/**\n * Creates a restricted form of a Closure \"class\":\n * - from the compiler's perspective, the instance returned from the\n * constructor is sealed (no new properties may be added). This enables\n * better checks.\n * - the compiler will rewrite this definition to a form that is optimal\n * for type checking and optimization (initially this will be a more\n * traditional form).\n *\n * @param {Function} superClass The superclass, Object or null.\n * @param {goog.defineClass.ClassDescriptor} def\n * An object literal describing\n * the class. It may have the following properties:\n * \"constructor\": the constructor function\n * \"statics\": an object literal containing methods to add to the constructor\n * as \"static\" methods or a function that will receive the constructor\n * function as its only parameter to which static properties can\n * be added.\n * all other properties are added to the prototype.\n * @return {!Function} The class constructor.\n * @deprecated Use ECMAScript class syntax instead.\n */\ngoog.defineClass = function(superClass, def) {\n // TODO(johnlenz): consider making the superClass an optional parameter.\n var constructor = def.constructor;\n var statics = def.statics;\n // Wrap the constructor prior to setting up the prototype and static methods.\n if (!constructor || constructor == Object.prototype.constructor) {\n constructor = function() {\n throw new Error(\n 'cannot instantiate an interface (no constructor defined).');\n };\n }\n\n var cls = goog.defineClass.createSealingConstructor_(constructor, superClass);\n if (superClass) {\n goog.inherits(cls, superClass);\n }\n\n // Remove all the properties that should not be copied to the prototype.\n delete def.constructor;\n delete def.statics;\n\n goog.defineClass.applyProperties_(cls.prototype, def);\n if (statics != null) {\n if (statics instanceof Function) {\n statics(cls);\n } else {\n goog.defineClass.applyProperties_(cls, statics);\n }\n }\n\n return cls;\n};\n\n\n/**\n * @typedef {{\n * constructor: (!Function|undefined),\n * statics: (Object|undefined|function(Function):void)\n * }}\n */\ngoog.defineClass.ClassDescriptor;\n\n\n/**\n * @define {boolean} Whether the instances returned by goog.defineClass should\n * be sealed when possible.\n *\n * When sealing is disabled the constructor function will not be wrapped by\n * goog.defineClass, making it incompatible with ES6 class methods.\n */\ngoog.defineClass.SEAL_CLASS_INSTANCES =\n goog.define('goog.defineClass.SEAL_CLASS_INSTANCES', goog.DEBUG);\n\n\n/**\n * If goog.defineClass.SEAL_CLASS_INSTANCES is enabled and Object.seal is\n * defined, this function will wrap the constructor in a function that seals the\n * results of the provided constructor function.\n *\n * @param {!Function} ctr The constructor whose results maybe be sealed.\n * @param {Function} superClass The superclass constructor.\n * @return {!Function} The replacement constructor.\n * @private\n */\ngoog.defineClass.createSealingConstructor_ = function(ctr, superClass) {\n if (!goog.defineClass.SEAL_CLASS_INSTANCES) {\n // Do now wrap the constructor when sealing is disabled. Angular code\n // depends on this for injection to work properly.\n return ctr;\n }\n\n // NOTE: The sealing behavior has been removed\n\n /**\n * @this {Object}\n * @return {?}\n */\n var wrappedCtr = function() {\n // Don't seal an instance of a subclass when it calls the constructor of\n // its super class as there is most likely still setup to do.\n var instance = ctr.apply(this, arguments) || this;\n instance[goog.UID_PROPERTY_] = instance[goog.UID_PROPERTY_];\n\n return instance;\n };\n\n return wrappedCtr;\n};\n\n\n\n// TODO(johnlenz): share these values with the goog.object\n/**\n * The names of the fields that are defined on Object.prototype.\n * @type {!Array}\n * @private\n * @const\n */\ngoog.defineClass.OBJECT_PROTOTYPE_FIELDS_ = [\n 'constructor', 'hasOwnProperty', 'isPrototypeOf', 'propertyIsEnumerable',\n 'toLocaleString', 'toString', 'valueOf'\n];\n\n\n// TODO(johnlenz): share this function with the goog.object\n/**\n * @param {!Object} target The object to add properties to.\n * @param {!Object} source The object to copy properties from.\n * @private\n */\ngoog.defineClass.applyProperties_ = function(target, source) {\n // TODO(johnlenz): update this to support ES5 getters/setters\n\n var key;\n for (key in source) {\n if (Object.prototype.hasOwnProperty.call(source, key)) {\n target[key] = source[key];\n }\n }\n\n // For IE the for-in-loop does not contain any properties that are not\n // enumerable on the prototype object (for example isPrototypeOf from\n // Object.prototype) and it will also not include 'replace' on objects that\n // extend String and change 'replace' (not that it is common for anyone to\n // extend anything except Object).\n for (var i = 0; i < goog.defineClass.OBJECT_PROTOTYPE_FIELDS_.length; i++) {\n key = goog.defineClass.OBJECT_PROTOTYPE_FIELDS_[i];\n if (Object.prototype.hasOwnProperty.call(source, key)) {\n target[key] = source[key];\n }\n }\n};\n\n/**\n * Returns the parameter.\n * @param {string} s\n * @return {string}\n * @private\n */\ngoog.identity_ = function(s) {\n return s;\n};\n\n\n/**\n * Creates Trusted Types policy if Trusted Types are supported by the browser.\n * The policy just blesses any string as a Trusted Type. It is not visibility\n * restricted because anyone can also call trustedTypes.createPolicy directly.\n * However, the allowed names should be restricted by a HTTP header and the\n * reference to the created policy should be visibility restricted.\n * @param {string} name\n * @return {?TrustedTypePolicy}\n */\ngoog.createTrustedTypesPolicy = function(name) {\n var policy = null;\n var policyFactory = goog.global.trustedTypes;\n if (!policyFactory || !policyFactory.createPolicy) {\n return policy;\n }\n // trustedTypes.createPolicy throws if called with a name that is already\n // registered, even in report-only mode. Until the API changes, catch the\n // error not to break the applications functionally. In such case, the code\n // will fall back to using regular Safe Types.\n // TODO(koto): Remove catching once createPolicy API stops throwing.\n try {\n policy = policyFactory.createPolicy(name, {\n createHTML: goog.identity_,\n createScript: goog.identity_,\n createScriptURL: goog.identity_\n });\n } catch (e) {\n goog.logToConsole_(e.message);\n }\n return policy;\n};\n\n// There's a bug in the compiler where without collapse properties the\n// Closure namespace defines do not guard code correctly. To help reduce code\n// size also check for !COMPILED even though it redundant until this is fixed.\nif (!COMPILED && goog.DEPENDENCIES_ENABLED) {\n\n\n /**\n * Tries to detect whether the current browser is Edge, based on the user\n * agent. This matches only pre-Chromium Edge.\n * @see https://docs.microsoft.com/en-us/microsoft-edge/web-platform/user-agent-string\n * @return {boolean} True if the current browser is Edge.\n * @private\n */\n goog.isEdge_ = function() {\n var userAgent = goog.global.navigator && goog.global.navigator.userAgent ?\n goog.global.navigator.userAgent :\n '';\n var edgeRe = /Edge\\/(\\d+)(\\.\\d)*/i;\n return !!userAgent.match(edgeRe);\n };\n\n\n /**\n * Tries to detect whether is in the context of an HTML document.\n * @return {boolean} True if it looks like HTML document.\n * @private\n */\n goog.inHtmlDocument_ = function() {\n /** @type {!Document} */\n var doc = goog.global.document;\n return doc != null && 'write' in doc; // XULDocument misses write.\n };\n\n\n /**\n * We'd like to check for if the document readyState is 'loading'; however\n * there are bugs on IE 10 and below where the readyState being anything other\n * than 'complete' is not reliable.\n * @return {boolean}\n * @private\n */\n goog.isDocumentLoading_ = function() {\n // attachEvent is available on IE 6 thru 10 only, and thus can be used to\n // detect those browsers.\n /** @type {!HTMLDocument} */\n var doc = goog.global.document;\n return doc.attachEvent ? doc.readyState != 'complete' :\n doc.readyState == 'loading';\n };\n\n\n /**\n * Tries to detect the base path of base.js script that bootstraps Closure.\n * @private\n */\n goog.findBasePath_ = function() {\n if (goog.global.CLOSURE_BASE_PATH != undefined &&\n // Anti DOM-clobbering runtime check (b/37736576).\n typeof goog.global.CLOSURE_BASE_PATH === 'string') {\n goog.basePath = goog.global.CLOSURE_BASE_PATH;\n return;\n } else if (!goog.inHtmlDocument_()) {\n return;\n }\n /** @type {!Document} */\n var doc = goog.global.document;\n // If we have a currentScript available, use it exclusively.\n var currentScript = doc.currentScript;\n if (currentScript) {\n var scripts = [currentScript];\n } else {\n var scripts = doc.getElementsByTagName('SCRIPT');\n }\n // Search backwards since the current script is in almost all cases the one\n // that has base.js.\n for (var i = scripts.length - 1; i >= 0; --i) {\n var script = /** @type {!HTMLScriptElement} */ (scripts[i]);\n var src = script.src;\n var qmark = src.lastIndexOf('?');\n var l = qmark == -1 ? src.length : qmark;\n if (src.substr(l - 7, 7) == 'base.js') {\n goog.basePath = src.substr(0, l - 7);\n return;\n }\n }\n };\n\n goog.findBasePath_();\n\n /** @struct @constructor @final */\n goog.Transpiler = function() {\n /** @private {?Object} */\n this.requiresTranspilation_ = null;\n /** @private {string} */\n this.transpilationTarget_ = goog.TRANSPILE_TO_LANGUAGE;\n };\n /**\n * Returns a newly created map from language mode string to a boolean\n * indicating whether transpilation should be done for that mode as well as\n * the highest level language that this environment supports.\n *\n * Guaranteed invariant:\n * For any two modes, l1 and l2 where l2 is a newer mode than l1,\n * `map[l1] == true` implies that `map[l2] == true`.\n *\n * Note this method is extracted and used elsewhere, so it cannot rely on\n * anything external (it should easily be able to be transformed into a\n * standalone, top level function).\n *\n * @private\n * @return {{\n * target: string,\n * map: !Object\n * }}\n */\n goog.Transpiler.prototype.createRequiresTranspilation_ = function() {\n var transpilationTarget = 'es3';\n var /** !Object */ requiresTranspilation = {'es3': false};\n var transpilationRequiredForAllLaterModes = false;\n\n /**\n * Adds an entry to requiresTranspliation for the given language mode.\n *\n * IMPORTANT: Calls must be made in order from oldest to newest language\n * mode.\n * @param {string} modeName\n * @param {function(): boolean} isSupported Returns true if the JS engine\n * supports the given mode.\n */\n function addNewerLanguageTranspilationCheck(modeName, isSupported) {\n if (transpilationRequiredForAllLaterModes) {\n requiresTranspilation[modeName] = true;\n } else if (isSupported()) {\n transpilationTarget = modeName;\n requiresTranspilation[modeName] = false;\n } else {\n requiresTranspilation[modeName] = true;\n transpilationRequiredForAllLaterModes = true;\n }\n }\n\n /**\n * Does the given code evaluate without syntax errors and return a truthy\n * result?\n */\n function /** boolean */ evalCheck(/** string */ code) {\n try {\n return !!eval(goog.CLOSURE_EVAL_PREFILTER_.createScript(code));\n } catch (ignored) {\n return false;\n }\n }\n\n // Identify ES3-only browsers by their incorrect treatment of commas.\n addNewerLanguageTranspilationCheck('es5', function() {\n return evalCheck('[1,].length==1');\n });\n addNewerLanguageTranspilationCheck('es6', function() {\n // Edge has a non-deterministic (i.e., not reproducible) bug with ES6:\n // https://github.com/Microsoft/ChakraCore/issues/1496.\n if (goog.isEdge_()) {\n // The Reflect.construct test below is flaky on Edge. It can sometimes\n // pass or fail on 40 15.15063, so just exit early for Edge and treat\n // it as ES5. Until we're on a more up to date version just always use\n // ES5. See https://github.com/Microsoft/ChakraCore/issues/3217.\n return false;\n }\n // Test es6: [FF50 (?), Edge 14 (?), Chrome 50]\n // (a) default params (specifically shadowing locals),\n // (b) destructuring, (c) block-scoped functions,\n // (d) for-of (const), (e) new.target/Reflect.construct\n var es6fullTest =\n 'class X{constructor(){if(new.target!=String)throw 1;this.x=42}}' +\n 'let q=Reflect.construct(X,[],String);if(q.x!=42||!(q instanceof ' +\n 'String))throw 1;for(const a of[2,3]){if(a==2)continue;function ' +\n 'f(z={a}){let a=0;return z.a}{function f(){return 0;}}return f()' +\n '==3}';\n\n return evalCheck('(()=>{\"use strict\";' + es6fullTest + '})()');\n });\n // ** and **= are the only new features in 'es7'\n addNewerLanguageTranspilationCheck('es7', function() {\n return evalCheck('2**3==8');\n });\n // async functions are the only new features in 'es8'\n addNewerLanguageTranspilationCheck('es8', function() {\n return evalCheck('async()=>1,1');\n });\n addNewerLanguageTranspilationCheck('es9', function() {\n return evalCheck('({...rest}={}),1');\n });\n // optional catch binding, unescaped unicode paragraph separator in strings\n addNewerLanguageTranspilationCheck('es_2019', function() {\n return evalCheck('let r;try{r=\"\\u2029\"}catch{};r');\n });\n // optional chaining, nullish coalescing\n // untested/unsupported: bigint, import meta\n addNewerLanguageTranspilationCheck('es_2020', function() {\n return evalCheck('null?.x??1');\n });\n addNewerLanguageTranspilationCheck('es_next', function() {\n return false; // assume it always need to transpile\n });\n return {target: transpilationTarget, map: requiresTranspilation};\n };\n\n\n /**\n * Determines whether the given language needs to be transpiled.\n * @param {string} lang\n * @param {string|undefined} module\n * @return {boolean}\n */\n goog.Transpiler.prototype.needsTranspile = function(lang, module) {\n if (goog.TRANSPILE == 'always') {\n return true;\n } else if (goog.TRANSPILE == 'never') {\n return false;\n } else if (!this.requiresTranspilation_) {\n var obj = this.createRequiresTranspilation_();\n this.requiresTranspilation_ = obj.map;\n this.transpilationTarget_ = this.transpilationTarget_ || obj.target;\n }\n if (lang in this.requiresTranspilation_) {\n if (this.requiresTranspilation_[lang]) {\n return true;\n } else if (\n goog.inHtmlDocument_() && module == 'es6' &&\n !('noModule' in goog.global.document.createElement('script'))) {\n return true;\n } else {\n return false;\n }\n } else {\n throw new Error('Unknown language mode: ' + lang);\n }\n };\n\n\n /**\n * Lazily retrieves the transpiler and applies it to the source.\n * @param {string} code JS code.\n * @param {string} path Path to the code.\n * @return {string} The transpiled code.\n */\n goog.Transpiler.prototype.transpile = function(code, path) {\n // TODO(johnplaisted): We should delete goog.transpile_ and just have this\n // function. But there's some compile error atm where goog.global is being\n // stripped incorrectly without this.\n return goog.transpile_(code, path, this.transpilationTarget_);\n };\n\n\n /** @private @final {!goog.Transpiler} */\n goog.transpiler_ = new goog.Transpiler();\n\n /**\n * Rewrites closing script tags in input to avoid ending an enclosing script\n * tag.\n *\n * @param {string} str\n * @return {string}\n * @private\n */\n goog.protectScriptTag_ = function(str) {\n return str.replace(/<\\/(SCRIPT)/ig, '\\\\x3c/$1');\n };\n\n\n /**\n * A debug loader is responsible for downloading and executing javascript\n * files in an unbundled, uncompiled environment.\n *\n * This can be custimized via the setDependencyFactory method, or by\n * CLOSURE_IMPORT_SCRIPT/CLOSURE_LOAD_FILE_SYNC.\n *\n * @struct @constructor @final @private\n */\n goog.DebugLoader_ = function() {\n /** @private @const {!Object} */\n this.dependencies_ = {};\n /** @private @const {!Object} */\n this.idToPath_ = {};\n /** @private @const {!Object} */\n this.written_ = {};\n /** @private @const {!Array} */\n this.loadingDeps_ = [];\n /** @private {!Array} */\n this.depsToLoad_ = [];\n /** @private {boolean} */\n this.paused_ = false;\n /** @private {!goog.DependencyFactory} */\n this.factory_ = new goog.DependencyFactory(goog.transpiler_);\n /** @private @const {!Object} */\n this.deferredCallbacks_ = {};\n /** @private @const {!Array} */\n this.deferredQueue_ = [];\n };\n\n /**\n * @param {!Array} namespaces\n * @param {function(): undefined} callback Function to call once all the\n * namespaces have loaded.\n */\n goog.DebugLoader_.prototype.bootstrap = function(namespaces, callback) {\n var cb = callback;\n function resolve() {\n if (cb) {\n goog.global.setTimeout(cb, 0);\n cb = null;\n }\n }\n\n if (!namespaces.length) {\n resolve();\n return;\n }\n\n var deps = [];\n for (var i = 0; i < namespaces.length; i++) {\n var path = this.getPathFromDeps_(namespaces[i]);\n if (!path) {\n throw new Error('Unregonized namespace: ' + namespaces[i]);\n }\n deps.push(this.dependencies_[path]);\n }\n\n var require = goog.require;\n var loaded = 0;\n for (var i = 0; i < namespaces.length; i++) {\n require(namespaces[i]);\n deps[i].onLoad(function() {\n if (++loaded == namespaces.length) {\n resolve();\n }\n });\n }\n };\n\n\n /**\n * Loads the Closure Dependency file.\n *\n * Exposed a public function so CLOSURE_NO_DEPS can be set to false, base\n * loaded, setDependencyFactory called, and then this called. i.e. allows\n * custom loading of the deps file.\n */\n goog.DebugLoader_.prototype.loadClosureDeps = function() {\n // Circumvent addDependency, which would try to transpile deps.js if\n // transpile is set to always.\n var relPath = 'deps.js';\n this.depsToLoad_.push(this.factory_.createDependency(\n goog.normalizePath_(goog.basePath + relPath), relPath, [], [], {},\n false));\n this.loadDeps_();\n };\n\n\n /**\n * Notifies the debug loader when a dependency has been requested.\n *\n * @param {string} absPathOrId Path of the dependency or goog id.\n * @param {boolean=} opt_force\n */\n goog.DebugLoader_.prototype.requested = function(absPathOrId, opt_force) {\n var path = this.getPathFromDeps_(absPathOrId);\n if (path &&\n (opt_force || this.areDepsLoaded_(this.dependencies_[path].requires))) {\n var callback = this.deferredCallbacks_[path];\n if (callback) {\n delete this.deferredCallbacks_[path];\n callback();\n }\n }\n };\n\n\n /**\n * Sets the dependency factory, which can be used to create custom\n * goog.Dependency implementations to control how dependencies are loaded.\n *\n * @param {!goog.DependencyFactory} factory\n */\n goog.DebugLoader_.prototype.setDependencyFactory = function(factory) {\n this.factory_ = factory;\n };\n\n\n /**\n * Travserses the dependency graph and queues the given dependency, and all of\n * its transitive dependencies, for loading and then starts loading if not\n * paused.\n *\n * @param {string} namespace\n * @private\n */\n goog.DebugLoader_.prototype.load_ = function(namespace) {\n if (!this.getPathFromDeps_(namespace)) {\n var errorMessage = 'goog.require could not find: ' + namespace;\n goog.logToConsole_(errorMessage);\n } else {\n var loader = this;\n\n var deps = [];\n\n /** @param {string} namespace */\n var visit = function(namespace) {\n var path = loader.getPathFromDeps_(namespace);\n\n if (!path) {\n throw new Error('Bad dependency path or symbol: ' + namespace);\n }\n\n if (loader.written_[path]) {\n return;\n }\n\n loader.written_[path] = true;\n\n var dep = loader.dependencies_[path];\n for (var i = 0; i < dep.requires.length; i++) {\n if (!goog.isProvided_(dep.requires[i])) {\n visit(dep.requires[i]);\n }\n }\n\n deps.push(dep);\n };\n\n visit(namespace);\n\n var wasLoading = !!this.depsToLoad_.length;\n this.depsToLoad_ = this.depsToLoad_.concat(deps);\n\n if (!this.paused_ && !wasLoading) {\n this.loadDeps_();\n }\n }\n };\n\n\n /**\n * Loads any queued dependencies until they are all loaded or paused.\n *\n * @private\n */\n goog.DebugLoader_.prototype.loadDeps_ = function() {\n var loader = this;\n var paused = this.paused_;\n\n while (this.depsToLoad_.length && !paused) {\n (function() {\n var loadCallDone = false;\n var dep = loader.depsToLoad_.shift();\n\n var loaded = false;\n loader.loading_(dep);\n\n var controller = {\n pause: function() {\n if (loadCallDone) {\n throw new Error('Cannot call pause after the call to load.');\n } else {\n paused = true;\n }\n },\n resume: function() {\n if (loadCallDone) {\n loader.resume_();\n } else {\n // Some dep called pause and then resume in the same load call.\n // Just keep running this same loop.\n paused = false;\n }\n },\n loaded: function() {\n if (loaded) {\n throw new Error('Double call to loaded.');\n }\n\n loaded = true;\n loader.loaded_(dep);\n },\n pending: function() {\n // Defensive copy.\n var pending = [];\n for (var i = 0; i < loader.loadingDeps_.length; i++) {\n pending.push(loader.loadingDeps_[i]);\n }\n return pending;\n },\n /**\n * @param {goog.ModuleType} type\n */\n setModuleState: function(type) {\n goog.moduleLoaderState_ = {\n type: type,\n moduleName: '',\n declareLegacyNamespace: false\n };\n },\n /** @type {function(string, string, string=)} */\n registerEs6ModuleExports: function(\n path, exports, opt_closureNamespace) {\n if (opt_closureNamespace) {\n goog.loadedModules_[opt_closureNamespace] = {\n exports: exports,\n type: goog.ModuleType.ES6,\n moduleId: opt_closureNamespace || ''\n };\n }\n },\n /** @type {function(string, ?)} */\n registerGoogModuleExports: function(moduleId, exports) {\n goog.loadedModules_[moduleId] = {\n exports: exports,\n type: goog.ModuleType.GOOG,\n moduleId: moduleId\n };\n },\n clearModuleState: function() {\n goog.moduleLoaderState_ = null;\n },\n defer: function(callback) {\n if (loadCallDone) {\n throw new Error(\n 'Cannot register with defer after the call to load.');\n }\n loader.defer_(dep, callback);\n },\n areDepsLoaded: function() {\n return loader.areDepsLoaded_(dep.requires);\n }\n };\n\n try {\n dep.load(controller);\n } finally {\n loadCallDone = true;\n }\n })();\n }\n\n if (paused) {\n this.pause_();\n }\n };\n\n\n /** @private */\n goog.DebugLoader_.prototype.pause_ = function() {\n this.paused_ = true;\n };\n\n\n /** @private */\n goog.DebugLoader_.prototype.resume_ = function() {\n if (this.paused_) {\n this.paused_ = false;\n this.loadDeps_();\n }\n };\n\n\n /**\n * Marks the given dependency as loading (load has been called but it has not\n * yet marked itself as finished). Useful for dependencies that want to know\n * what else is loading. Example: goog.modules cannot eval if there are\n * loading dependencies.\n *\n * @param {!goog.Dependency} dep\n * @private\n */\n goog.DebugLoader_.prototype.loading_ = function(dep) {\n this.loadingDeps_.push(dep);\n };\n\n\n /**\n * Marks the given dependency as having finished loading and being available\n * for require.\n *\n * @param {!goog.Dependency} dep\n * @private\n */\n goog.DebugLoader_.prototype.loaded_ = function(dep) {\n for (var i = 0; i < this.loadingDeps_.length; i++) {\n if (this.loadingDeps_[i] == dep) {\n this.loadingDeps_.splice(i, 1);\n break;\n }\n }\n\n for (var i = 0; i < this.deferredQueue_.length; i++) {\n if (this.deferredQueue_[i] == dep.path) {\n this.deferredQueue_.splice(i, 1);\n break;\n }\n }\n\n if (this.loadingDeps_.length == this.deferredQueue_.length &&\n !this.depsToLoad_.length) {\n // Something has asked to load these, but they may not be directly\n // required again later, so load them now that we know we're done loading\n // everything else. e.g. a goog module entry point.\n while (this.deferredQueue_.length) {\n this.requested(this.deferredQueue_.shift(), true);\n }\n }\n\n dep.loaded();\n };\n\n\n /**\n * @param {!Array} pathsOrIds\n * @return {boolean}\n * @private\n */\n goog.DebugLoader_.prototype.areDepsLoaded_ = function(pathsOrIds) {\n for (var i = 0; i < pathsOrIds.length; i++) {\n var path = this.getPathFromDeps_(pathsOrIds[i]);\n if (!path ||\n (!(path in this.deferredCallbacks_) &&\n !goog.isProvided_(pathsOrIds[i]))) {\n return false;\n }\n }\n\n return true;\n };\n\n\n /**\n * @param {string} absPathOrId\n * @return {?string}\n * @private\n */\n goog.DebugLoader_.prototype.getPathFromDeps_ = function(absPathOrId) {\n if (absPathOrId in this.idToPath_) {\n return this.idToPath_[absPathOrId];\n } else if (absPathOrId in this.dependencies_) {\n return absPathOrId;\n } else {\n return null;\n }\n };\n\n\n /**\n * @param {!goog.Dependency} dependency\n * @param {!Function} callback\n * @private\n */\n goog.DebugLoader_.prototype.defer_ = function(dependency, callback) {\n this.deferredCallbacks_[dependency.path] = callback;\n this.deferredQueue_.push(dependency.path);\n };\n\n\n /**\n * Interface for goog.Dependency implementations to have some control over\n * loading of dependencies.\n *\n * @record\n */\n goog.LoadController = function() {};\n\n\n /**\n * Tells the controller to halt loading of more dependencies.\n */\n goog.LoadController.prototype.pause = function() {};\n\n\n /**\n * Tells the controller to resume loading of more dependencies if paused.\n */\n goog.LoadController.prototype.resume = function() {};\n\n\n /**\n * Tells the controller that this dependency has finished loading.\n *\n * This causes this to be removed from pending() and any load callbacks to\n * fire.\n */\n goog.LoadController.prototype.loaded = function() {};\n\n\n /**\n * List of dependencies on which load has been called but which have not\n * called loaded on their controller. This includes the current dependency.\n *\n * @return {!Array}\n */\n goog.LoadController.prototype.pending = function() {};\n\n\n /**\n * Registers an object as an ES6 module's exports so that goog.modules may\n * require it by path.\n *\n * @param {string} path Full path of the module.\n * @param {?} exports\n * @param {string=} opt_closureNamespace Closure namespace to associate with\n * this module.\n */\n goog.LoadController.prototype.registerEs6ModuleExports = function(\n path, exports, opt_closureNamespace) {};\n\n\n /**\n * Sets the current module state.\n *\n * @param {goog.ModuleType} type Type of module.\n */\n goog.LoadController.prototype.setModuleState = function(type) {};\n\n\n /**\n * Clears the current module state.\n */\n goog.LoadController.prototype.clearModuleState = function() {};\n\n\n /**\n * Registers a callback to call once the dependency is actually requested\n * via goog.require + all of the immediate dependencies have been loaded or\n * all other files have been loaded. Allows for lazy loading until\n * require'd without pausing dependency loading, which is needed on old IE.\n *\n * @param {!Function} callback\n */\n goog.LoadController.prototype.defer = function(callback) {};\n\n\n /**\n * @return {boolean}\n */\n goog.LoadController.prototype.areDepsLoaded = function() {};\n\n\n /**\n * Basic super class for all dependencies Closure Library can load.\n *\n * This default implementation is designed to load untranspiled, non-module\n * scripts in a web broswer.\n *\n * For transpiled non-goog.module files {@see goog.TranspiledDependency}.\n * For goog.modules see {@see goog.GoogModuleDependency}.\n * For untranspiled ES6 modules {@see goog.Es6ModuleDependency}.\n *\n * @param {string} path Absolute path of this script.\n * @param {string} relativePath Path of this script relative to goog.basePath.\n * @param {!Array} provides goog.provided or goog.module symbols\n * in this file.\n * @param {!Array} requires goog symbols or relative paths to Closure\n * this depends on.\n * @param {!Object} loadFlags\n * @struct @constructor\n */\n goog.Dependency = function(\n path, relativePath, provides, requires, loadFlags) {\n /** @const */\n this.path = path;\n /** @const */\n this.relativePath = relativePath;\n /** @const */\n this.provides = provides;\n /** @const */\n this.requires = requires;\n /** @const */\n this.loadFlags = loadFlags;\n /** @private {boolean} */\n this.loaded_ = false;\n /** @private {!Array} */\n this.loadCallbacks_ = [];\n };\n\n\n /**\n * @return {string} The pathname part of this dependency's path if it is a\n * URI.\n */\n goog.Dependency.prototype.getPathName = function() {\n var pathName = this.path;\n var protocolIndex = pathName.indexOf('://');\n if (protocolIndex >= 0) {\n pathName = pathName.substring(protocolIndex + 3);\n var slashIndex = pathName.indexOf('/');\n if (slashIndex >= 0) {\n pathName = pathName.substring(slashIndex + 1);\n }\n }\n return pathName;\n };\n\n\n /**\n * @param {function()} callback Callback to fire as soon as this has loaded.\n * @final\n */\n goog.Dependency.prototype.onLoad = function(callback) {\n if (this.loaded_) {\n callback();\n } else {\n this.loadCallbacks_.push(callback);\n }\n };\n\n\n /**\n * Marks this dependency as loaded and fires any callbacks registered with\n * onLoad.\n * @final\n */\n goog.Dependency.prototype.loaded = function() {\n this.loaded_ = true;\n var callbacks = this.loadCallbacks_;\n this.loadCallbacks_ = [];\n for (var i = 0; i < callbacks.length; i++) {\n callbacks[i]();\n }\n };\n\n\n /**\n * Whether or not document.written / appended script tags should be deferred.\n *\n * @private {boolean}\n */\n goog.Dependency.defer_ = false;\n\n\n /**\n * Map of script ready / state change callbacks. Old IE cannot handle putting\n * these properties on goog.global.\n *\n * @private @const {!Object}\n */\n goog.Dependency.callbackMap_ = {};\n\n\n /**\n * @param {function(...?):?} callback\n * @return {string}\n * @private\n */\n goog.Dependency.registerCallback_ = function(callback) {\n var key = Math.random().toString(32);\n goog.Dependency.callbackMap_[key] = callback;\n return key;\n };\n\n\n /**\n * @param {string} key\n * @private\n */\n goog.Dependency.unregisterCallback_ = function(key) {\n delete goog.Dependency.callbackMap_[key];\n };\n\n\n /**\n * @param {string} key\n * @param {...?} var_args\n * @private\n * @suppress {unusedPrivateMembers}\n */\n goog.Dependency.callback_ = function(key, var_args) {\n if (key in goog.Dependency.callbackMap_) {\n var callback = goog.Dependency.callbackMap_[key];\n var args = [];\n for (var i = 1; i < arguments.length; i++) {\n args.push(arguments[i]);\n }\n callback.apply(undefined, args);\n } else {\n var errorMessage = 'Callback key ' + key +\n ' does not exist (was base.js loaded more than once?).';\n throw Error(errorMessage);\n }\n };\n\n\n /**\n * Starts loading this dependency. This dependency can pause loading if it\n * needs to and resume it later via the controller interface.\n *\n * When this is loaded it should call controller.loaded(). Note that this will\n * end up calling the loaded method of this dependency; there is no need to\n * call it explicitly.\n *\n * @param {!goog.LoadController} controller\n */\n goog.Dependency.prototype.load = function(controller) {\n if (goog.global.CLOSURE_IMPORT_SCRIPT) {\n if (goog.global.CLOSURE_IMPORT_SCRIPT(this.path)) {\n controller.loaded();\n } else {\n controller.pause();\n }\n return;\n }\n\n if (!goog.inHtmlDocument_()) {\n goog.logToConsole_(\n 'Cannot use default debug loader outside of HTML documents.');\n if (this.relativePath == 'deps.js') {\n // Some old code is relying on base.js auto loading deps.js failing with\n // no error before later setting CLOSURE_IMPORT_SCRIPT.\n // CLOSURE_IMPORT_SCRIPT should be set *before* base.js is loaded, or\n // CLOSURE_NO_DEPS set to true.\n goog.logToConsole_(\n 'Consider setting CLOSURE_IMPORT_SCRIPT before loading base.js, ' +\n 'or setting CLOSURE_NO_DEPS to true.');\n controller.loaded();\n } else {\n controller.pause();\n }\n return;\n }\n\n /** @type {!HTMLDocument} */\n var doc = goog.global.document;\n\n // If the user tries to require a new symbol after document load,\n // something has gone terribly wrong. Doing a document.write would\n // wipe out the page. This does not apply to the CSP-compliant method\n // of writing script tags.\n if (doc.readyState == 'complete' &&\n !goog.ENABLE_CHROME_APP_SAFE_SCRIPT_LOADING) {\n // Certain test frameworks load base.js multiple times, which tries\n // to write deps.js each time. If that happens, just fail silently.\n // These frameworks wipe the page between each load of base.js, so this\n // is OK.\n var isDeps = /\\bdeps.js$/.test(this.path);\n if (isDeps) {\n controller.loaded();\n return;\n } else {\n throw Error('Cannot write \"' + this.path + '\" after document load');\n }\n }\n\n var nonce = goog.getScriptNonce_();\n if (!goog.ENABLE_CHROME_APP_SAFE_SCRIPT_LOADING &&\n goog.isDocumentLoading_()) {\n var key;\n var callback = function(script) {\n if (script.readyState && script.readyState != 'complete') {\n script.onload = callback;\n return;\n }\n goog.Dependency.unregisterCallback_(key);\n controller.loaded();\n };\n key = goog.Dependency.registerCallback_(callback);\n\n var defer = goog.Dependency.defer_ ? ' defer' : '';\n var nonceAttr = nonce ? ' nonce=\"' + nonce + '\"' : '';\n var script = '