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node_modules/webpack/lib/ExternalModule.js

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+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const { OriginalSource, RawSource } = require("webpack-sources");
+const ConcatenationScope = require("./ConcatenationScope");
+const { UsageState } = require("./ExportsInfo");
+const InitFragment = require("./InitFragment");
+const Module = require("./Module");
+const { JAVASCRIPT_MODULE_TYPE_DYNAMIC } = require("./ModuleTypeConstants");
+const RuntimeGlobals = require("./RuntimeGlobals");
+const Template = require("./Template");
+const StaticExportsDependency = require("./dependencies/StaticExportsDependency");
+const createHash = require("./util/createHash");
+const extractUrlAndGlobal = require("./util/extractUrlAndGlobal");
+const makeSerializable = require("./util/makeSerializable");
+const propertyAccess = require("./util/propertyAccess");
+const { register } = require("./util/serialization");
+
+/** @typedef {import("webpack-sources").Source} Source */
+/** @typedef {import("../declarations/WebpackOptions").WebpackOptionsNormalized} WebpackOptions */
+/** @typedef {import("./Chunk")} Chunk */
+/** @typedef {import("./ChunkGraph")} ChunkGraph */
+/** @typedef {import("./Compilation")} Compilation */
+/** @typedef {import("./Dependency").UpdateHashContext} UpdateHashContext */
+/** @typedef {import("./DependencyTemplates")} DependencyTemplates */
+/** @typedef {import("./ExportsInfo")} ExportsInfo */
+/** @typedef {import("./Module").CodeGenerationContext} CodeGenerationContext */
+/** @typedef {import("./Module").CodeGenerationResult} CodeGenerationResult */
+/** @typedef {import("./Module").ConcatenationBailoutReasonContext} ConcatenationBailoutReasonContext */
+/** @typedef {import("./Module").LibIdentOptions} LibIdentOptions */
+/** @typedef {import("./Module").NeedBuildContext} NeedBuildContext */
+/** @typedef {import("./NormalModuleFactory")} NormalModuleFactory */
+/** @typedef {import("./RequestShortener")} RequestShortener */
+/** @typedef {import("./ResolverFactory").ResolverWithOptions} ResolverWithOptions */
+/** @typedef {import("./RuntimeTemplate")} RuntimeTemplate */
+/** @typedef {import("./WebpackError")} WebpackError */
+/** @typedef {import("./javascript/JavascriptModulesPlugin").ChunkRenderContext} ChunkRenderContext */
+/** @typedef {import("./serialization/ObjectMiddleware").ObjectDeserializerContext} ObjectDeserializerContext */
+/** @typedef {import("./serialization/ObjectMiddleware").ObjectSerializerContext} ObjectSerializerContext */
+/** @typedef {import("./util/Hash")} Hash */
+/** @typedef {typeof import("./util/Hash")} HashConstructor */
+/** @typedef {import("./util/fs").InputFileSystem} InputFileSystem */
+/** @typedef {import("./util/runtime").RuntimeSpec} RuntimeSpec */
+
+/**
+ * @typedef {Object} SourceData
+ * @property {boolean=} iife
+ * @property {string=} init
+ * @property {string} expression
+ * @property {InitFragment<ChunkRenderContext>[]=} chunkInitFragments
+ * @property {ReadonlySet<string>=} runtimeRequirements
+ */
+
+const TYPES = new Set(["javascript"]);
+const CSS_TYPES = new Set(["css-import"]);
+const RUNTIME_REQUIREMENTS = new Set([RuntimeGlobals.module]);
+const RUNTIME_REQUIREMENTS_FOR_SCRIPT = new Set([RuntimeGlobals.loadScript]);
+const RUNTIME_REQUIREMENTS_FOR_MODULE = new Set([
+	RuntimeGlobals.definePropertyGetters
+]);
+const EMPTY_RUNTIME_REQUIREMENTS = new Set([]);
+
+/**
+ * @param {string|string[]} variableName the variable name or path
+ * @param {string} type the module system
+ * @returns {SourceData} the generated source
+ */
+const getSourceForGlobalVariableExternal = (variableName, type) => {
+	if (!Array.isArray(variableName)) {
+		// make it an array as the look up works the same basically
+		variableName = [variableName];
+	}
+
+	// needed for e.g. window["some"]["thing"]
+	const objectLookup = variableName.map(r => `[${JSON.stringify(r)}]`).join("");
+	return {
+		iife: type === "this",
+		expression: `${type}${objectLookup}`
+	};
+};
+
+/**
+ * @param {string|string[]} moduleAndSpecifiers the module request
+ * @returns {SourceData} the generated source
+ */
+const getSourceForCommonJsExternal = moduleAndSpecifiers => {
+	if (!Array.isArray(moduleAndSpecifiers)) {
+		return {
+			expression: `require(${JSON.stringify(moduleAndSpecifiers)})`
+		};
+	}
+	const moduleName = moduleAndSpecifiers[0];
+	return {
+		expression: `require(${JSON.stringify(moduleName)})${propertyAccess(
+			moduleAndSpecifiers,
+			1
+		)}`
+	};
+};
+
+/**
+ * @param {string|string[]} moduleAndSpecifiers the module request
+ * @param {string} importMetaName import.meta name
+ * @returns {SourceData} the generated source
+ */
+const getSourceForCommonJsExternalInNodeModule = (
+	moduleAndSpecifiers,
+	importMetaName
+) => {
+	const chunkInitFragments = [
+		new InitFragment(
+			'import { createRequire as __WEBPACK_EXTERNAL_createRequire } from "module";\n',
+			InitFragment.STAGE_HARMONY_IMPORTS,
+			0,
+			"external module node-commonjs"
+		)
+	];
+	if (!Array.isArray(moduleAndSpecifiers)) {
+		return {
+			chunkInitFragments,
+			expression: `__WEBPACK_EXTERNAL_createRequire(${importMetaName}.url)(${JSON.stringify(
+				moduleAndSpecifiers
+			)})`
+		};
+	}
+	const moduleName = moduleAndSpecifiers[0];
+	return {
+		chunkInitFragments,
+		expression: `__WEBPACK_EXTERNAL_createRequire(${importMetaName}.url)(${JSON.stringify(
+			moduleName
+		)})${propertyAccess(moduleAndSpecifiers, 1)}`
+	};
+};
+
+/**
+ * @param {string|string[]} moduleAndSpecifiers the module request
+ * @param {RuntimeTemplate} runtimeTemplate the runtime template
+ * @returns {SourceData} the generated source
+ */
+const getSourceForImportExternal = (moduleAndSpecifiers, runtimeTemplate) => {
+	const importName = runtimeTemplate.outputOptions.importFunctionName;
+	if (!runtimeTemplate.supportsDynamicImport() && importName === "import") {
+		throw new Error(
+			"The target environment doesn't support 'import()' so it's not possible to use external type 'import'"
+		);
+	}
+	if (!Array.isArray(moduleAndSpecifiers)) {
+		return {
+			expression: `${importName}(${JSON.stringify(moduleAndSpecifiers)});`
+		};
+	}
+	if (moduleAndSpecifiers.length === 1) {
+		return {
+			expression: `${importName}(${JSON.stringify(moduleAndSpecifiers[0])});`
+		};
+	}
+	const moduleName = moduleAndSpecifiers[0];
+	return {
+		expression: `${importName}(${JSON.stringify(
+			moduleName
+		)}).then(${runtimeTemplate.returningFunction(
+			`module${propertyAccess(moduleAndSpecifiers, 1)}`,
+			"module"
+		)});`
+	};
+};
+
+class ModuleExternalInitFragment extends InitFragment {
+	/**
+	 * @param {string} request import source
+	 * @param {string=} ident recomputed ident
+	 * @param {string | HashConstructor=} hashFunction the hash function to use
+	 */
+	constructor(request, ident, hashFunction = "md4") {
+		if (ident === undefined) {
+			ident = Template.toIdentifier(request);
+			if (ident !== request) {
+				ident += `_${createHash(hashFunction)
+					.update(request)
+					.digest("hex")
+					.slice(0, 8)}`;
+			}
+		}
+		const identifier = `__WEBPACK_EXTERNAL_MODULE_${ident}__`;
+		super(
+			`import * as ${identifier} from ${JSON.stringify(request)};\n`,
+			InitFragment.STAGE_HARMONY_IMPORTS,
+			0,
+			`external module import ${ident}`
+		);
+		this._ident = ident;
+		this._identifier = identifier;
+		this._request = request;
+	}
+
+	getNamespaceIdentifier() {
+		return this._identifier;
+	}
+}
+
+register(
+	ModuleExternalInitFragment,
+	"webpack/lib/ExternalModule",
+	"ModuleExternalInitFragment",
+	{
+		serialize(obj, { write }) {
+			write(obj._request);
+			write(obj._ident);
+		},
+		deserialize({ read }) {
+			return new ModuleExternalInitFragment(read(), read());
+		}
+	}
+);
+
+const generateModuleRemapping = (input, exportsInfo, runtime) => {
+	if (exportsInfo.otherExportsInfo.getUsed(runtime) === UsageState.Unused) {
+		const properties = [];
+		for (const exportInfo of exportsInfo.orderedExports) {
+			const used = exportInfo.getUsedName(exportInfo.name, runtime);
+			if (!used) continue;
+			const nestedInfo = exportInfo.getNestedExportsInfo();
+			if (nestedInfo) {
+				const nestedExpr = generateModuleRemapping(
+					`${input}${propertyAccess([exportInfo.name])}`,
+					nestedInfo
+				);
+				if (nestedExpr) {
+					properties.push(`[${JSON.stringify(used)}]: y(${nestedExpr})`);
+					continue;
+				}
+			}
+			properties.push(
+				`[${JSON.stringify(used)}]: () => ${input}${propertyAccess([
+					exportInfo.name
+				])}`
+			);
+		}
+		return `x({ ${properties.join(", ")} })`;
+	}
+};
+
+/**
+ * @param {string|string[]} moduleAndSpecifiers the module request
+ * @param {ExportsInfo} exportsInfo exports info of this module
+ * @param {RuntimeSpec} runtime the runtime
+ * @param {string | HashConstructor=} hashFunction the hash function to use
+ * @returns {SourceData} the generated source
+ */
+const getSourceForModuleExternal = (
+	moduleAndSpecifiers,
+	exportsInfo,
+	runtime,
+	hashFunction
+) => {
+	if (!Array.isArray(moduleAndSpecifiers))
+		moduleAndSpecifiers = [moduleAndSpecifiers];
+	const initFragment = new ModuleExternalInitFragment(
+		moduleAndSpecifiers[0],
+		undefined,
+		hashFunction
+	);
+	const baseAccess = `${initFragment.getNamespaceIdentifier()}${propertyAccess(
+		moduleAndSpecifiers,
+		1
+	)}`;
+	const moduleRemapping = generateModuleRemapping(
+		baseAccess,
+		exportsInfo,
+		runtime
+	);
+	let expression = moduleRemapping || baseAccess;
+	return {
+		expression,
+		init: `var x = y => { var x = {}; ${RuntimeGlobals.definePropertyGetters}(x, y); return x; }\nvar y = x => () => x`,
+		runtimeRequirements: moduleRemapping
+			? RUNTIME_REQUIREMENTS_FOR_MODULE
+			: undefined,
+		chunkInitFragments: [initFragment]
+	};
+};
+
+/**
+ * @param {string|string[]} urlAndGlobal the script request
+ * @param {RuntimeTemplate} runtimeTemplate the runtime template
+ * @returns {SourceData} the generated source
+ */
+const getSourceForScriptExternal = (urlAndGlobal, runtimeTemplate) => {
+	if (typeof urlAndGlobal === "string") {
+		urlAndGlobal = extractUrlAndGlobal(urlAndGlobal);
+	}
+	const url = urlAndGlobal[0];
+	const globalName = urlAndGlobal[1];
+	return {
+		init: "var __webpack_error__ = new Error();",
+		expression: `new Promise(${runtimeTemplate.basicFunction(
+			"resolve, reject",
+			[
+				`if(typeof ${globalName} !== "undefined") return resolve();`,
+				`${RuntimeGlobals.loadScript}(${JSON.stringify(
+					url
+				)}, ${runtimeTemplate.basicFunction("event", [
+					`if(typeof ${globalName} !== "undefined") return resolve();`,
+					"var errorType = event && (event.type === 'load' ? 'missing' : event.type);",
+					"var realSrc = event && event.target && event.target.src;",
+					"__webpack_error__.message = 'Loading script failed.\\n(' + errorType + ': ' + realSrc + ')';",
+					"__webpack_error__.name = 'ScriptExternalLoadError';",
+					"__webpack_error__.type = errorType;",
+					"__webpack_error__.request = realSrc;",
+					"reject(__webpack_error__);"
+				])}, ${JSON.stringify(globalName)});`
+			]
+		)}).then(${runtimeTemplate.returningFunction(
+			`${globalName}${propertyAccess(urlAndGlobal, 2)}`
+		)})`,
+		runtimeRequirements: RUNTIME_REQUIREMENTS_FOR_SCRIPT
+	};
+};
+
+/**
+ * @param {string} variableName the variable name to check
+ * @param {string} request the request path
+ * @param {RuntimeTemplate} runtimeTemplate the runtime template
+ * @returns {string} the generated source
+ */
+const checkExternalVariable = (variableName, request, runtimeTemplate) => {
+	return `if(typeof ${variableName} === 'undefined') { ${runtimeTemplate.throwMissingModuleErrorBlock(
+		{ request }
+	)} }\n`;
+};
+
+/**
+ * @param {string|number} id the module id
+ * @param {boolean} optional true, if the module is optional
+ * @param {string|string[]} request the request path
+ * @param {RuntimeTemplate} runtimeTemplate the runtime template
+ * @returns {SourceData} the generated source
+ */
+const getSourceForAmdOrUmdExternal = (
+	id,
+	optional,
+	request,
+	runtimeTemplate
+) => {
+	const externalVariable = `__WEBPACK_EXTERNAL_MODULE_${Template.toIdentifier(
+		`${id}`
+	)}__`;
+	return {
+		init: optional
+			? checkExternalVariable(
+					externalVariable,
+					Array.isArray(request) ? request.join(".") : request,
+					runtimeTemplate
+			  )
+			: undefined,
+		expression: externalVariable
+	};
+};
+
+/**
+ * @param {boolean} optional true, if the module is optional
+ * @param {string|string[]} request the request path
+ * @param {RuntimeTemplate} runtimeTemplate the runtime template
+ * @returns {SourceData} the generated source
+ */
+const getSourceForDefaultCase = (optional, request, runtimeTemplate) => {
+	if (!Array.isArray(request)) {
+		// make it an array as the look up works the same basically
+		request = [request];
+	}
+
+	const variableName = request[0];
+	const objectLookup = propertyAccess(request, 1);
+	return {
+		init: optional
+			? checkExternalVariable(variableName, request.join("."), runtimeTemplate)
+			: undefined,
+		expression: `${variableName}${objectLookup}`
+	};
+};
+
+class ExternalModule extends Module {
+	/**
+	 * @param {string | string[] | Record<string, string | string[]>} request request
+	 * @param {TODO} type type
+	 * @param {string} userRequest user request
+	 */
+	constructor(request, type, userRequest) {
+		super(JAVASCRIPT_MODULE_TYPE_DYNAMIC, null);
+
+		// Info from Factory
+		/** @type {string | string[] | Record<string, string | string[]>} */
+		this.request = request;
+		/** @type {string} */
+		this.externalType = type;
+		/** @type {string} */
+		this.userRequest = userRequest;
+	}
+
+	/**
+	 * @returns {Set<string>} types available (do not mutate)
+	 */
+	getSourceTypes() {
+		return this.externalType === "css-import" ? CSS_TYPES : TYPES;
+	}
+
+	/**
+	 * @param {LibIdentOptions} options options
+	 * @returns {string | null} an identifier for library inclusion
+	 */
+	libIdent(options) {
+		return this.userRequest;
+	}
+
+	/**
+	 * @param {Chunk} chunk the chunk which condition should be checked
+	 * @param {Compilation} compilation the compilation
+	 * @returns {boolean} true, if the chunk is ok for the module
+	 */
+	chunkCondition(chunk, { chunkGraph }) {
+		return this.externalType === "css-import"
+			? true
+			: chunkGraph.getNumberOfEntryModules(chunk) > 0;
+	}
+
+	/**
+	 * @returns {string} a unique identifier of the module
+	 */
+	identifier() {
+		return `external ${this.externalType} ${JSON.stringify(this.request)}`;
+	}
+
+	/**
+	 * @param {RequestShortener} requestShortener the request shortener
+	 * @returns {string} a user readable identifier of the module
+	 */
+	readableIdentifier(requestShortener) {
+		return "external " + JSON.stringify(this.request);
+	}
+
+	/**
+	 * @param {NeedBuildContext} context context info
+	 * @param {function((WebpackError | null)=, boolean=): void} callback callback function, returns true, if the module needs a rebuild
+	 * @returns {void}
+	 */
+	needBuild(context, callback) {
+		return callback(null, !this.buildMeta);
+	}
+
+	/**
+	 * @param {WebpackOptions} options webpack options
+	 * @param {Compilation} compilation the compilation
+	 * @param {ResolverWithOptions} resolver the resolver
+	 * @param {InputFileSystem} fs the file system
+	 * @param {function(WebpackError=): void} callback callback function
+	 * @returns {void}
+	 */
+	build(options, compilation, resolver, fs, callback) {
+		this.buildMeta = {
+			async: false,
+			exportsType: undefined
+		};
+		this.buildInfo = {
+			strict: true,
+			topLevelDeclarations: new Set(),
+			module: compilation.outputOptions.module
+		};
+		const { request, externalType } = this._getRequestAndExternalType();
+		this.buildMeta.exportsType = "dynamic";
+		let canMangle = false;
+		this.clearDependenciesAndBlocks();
+		switch (externalType) {
+			case "this":
+				this.buildInfo.strict = false;
+				break;
+			case "system":
+				if (!Array.isArray(request) || request.length === 1) {
+					this.buildMeta.exportsType = "namespace";
+					canMangle = true;
+				}
+				break;
+			case "module":
+				if (this.buildInfo.module) {
+					if (!Array.isArray(request) || request.length === 1) {
+						this.buildMeta.exportsType = "namespace";
+						canMangle = true;
+					}
+				} else {
+					this.buildMeta.async = true;
+					if (!Array.isArray(request) || request.length === 1) {
+						this.buildMeta.exportsType = "namespace";
+						canMangle = false;
+					}
+				}
+				break;
+			case "script":
+			case "promise":
+				this.buildMeta.async = true;
+				break;
+			case "import":
+				this.buildMeta.async = true;
+				if (!Array.isArray(request) || request.length === 1) {
+					this.buildMeta.exportsType = "namespace";
+					canMangle = false;
+				}
+				break;
+		}
+		this.addDependency(new StaticExportsDependency(true, canMangle));
+		callback();
+	}
+
+	restoreFromUnsafeCache(unsafeCacheData, normalModuleFactory) {
+		this._restoreFromUnsafeCache(unsafeCacheData, normalModuleFactory);
+	}
+
+	/**
+	 * @param {ConcatenationBailoutReasonContext} context context
+	 * @returns {string | undefined} reason why this module can't be concatenated, undefined when it can be concatenated
+	 */
+	getConcatenationBailoutReason({ moduleGraph }) {
+		switch (this.externalType) {
+			case "amd":
+			case "amd-require":
+			case "umd":
+			case "umd2":
+			case "system":
+			case "jsonp":
+				return `${this.externalType} externals can't be concatenated`;
+		}
+		return undefined;
+	}
+
+	_getRequestAndExternalType() {
+		let { request, externalType } = this;
+		if (typeof request === "object" && !Array.isArray(request))
+			request = request[externalType];
+		return { request, externalType };
+	}
+
+	_getSourceData(
+		request,
+		externalType,
+		runtimeTemplate,
+		moduleGraph,
+		chunkGraph,
+		runtime
+	) {
+		switch (externalType) {
+			case "this":
+			case "window":
+			case "self":
+				return getSourceForGlobalVariableExternal(request, this.externalType);
+			case "global":
+				return getSourceForGlobalVariableExternal(
+					request,
+					runtimeTemplate.globalObject
+				);
+			case "commonjs":
+			case "commonjs2":
+			case "commonjs-module":
+			case "commonjs-static":
+				return getSourceForCommonJsExternal(request);
+			case "node-commonjs":
+				return this.buildInfo.module
+					? getSourceForCommonJsExternalInNodeModule(
+							request,
+							runtimeTemplate.outputOptions.importMetaName
+					  )
+					: getSourceForCommonJsExternal(request);
+			case "amd":
+			case "amd-require":
+			case "umd":
+			case "umd2":
+			case "system":
+			case "jsonp": {
+				const id = chunkGraph.getModuleId(this);
+				return getSourceForAmdOrUmdExternal(
+					id !== null ? id : this.identifier(),
+					this.isOptional(moduleGraph),
+					request,
+					runtimeTemplate
+				);
+			}
+			case "import":
+				return getSourceForImportExternal(request, runtimeTemplate);
+			case "script":
+				return getSourceForScriptExternal(request, runtimeTemplate);
+			case "module": {
+				if (!this.buildInfo.module) {
+					if (!runtimeTemplate.supportsDynamicImport()) {
+						throw new Error(
+							"The target environment doesn't support dynamic import() syntax so it's not possible to use external type 'module' within a script" +
+								(runtimeTemplate.supportsEcmaScriptModuleSyntax()
+									? "\nDid you mean to build a EcmaScript Module ('output.module: true')?"
+									: "")
+						);
+					}
+					return getSourceForImportExternal(request, runtimeTemplate);
+				}
+				if (!runtimeTemplate.supportsEcmaScriptModuleSyntax()) {
+					throw new Error(
+						"The target environment doesn't support EcmaScriptModule syntax so it's not possible to use external type 'module'"
+					);
+				}
+				return getSourceForModuleExternal(
+					request,
+					moduleGraph.getExportsInfo(this),
+					runtime,
+					runtimeTemplate.outputOptions.hashFunction
+				);
+			}
+			case "var":
+			case "promise":
+			case "const":
+			case "let":
+			case "assign":
+			default:
+				return getSourceForDefaultCase(
+					this.isOptional(moduleGraph),
+					request,
+					runtimeTemplate
+				);
+		}
+	}
+
+	/**
+	 * @param {CodeGenerationContext} context context for code generation
+	 * @returns {CodeGenerationResult} result
+	 */
+	codeGeneration({
+		runtimeTemplate,
+		moduleGraph,
+		chunkGraph,
+		runtime,
+		concatenationScope
+	}) {
+		const { request, externalType } = this._getRequestAndExternalType();
+		switch (externalType) {
+			case "asset": {
+				const sources = new Map();
+				sources.set(
+					"javascript",
+					new RawSource(`module.exports = ${JSON.stringify(request)};`)
+				);
+				const data = new Map();
+				data.set("url", request);
+				return { sources, runtimeRequirements: RUNTIME_REQUIREMENTS, data };
+			}
+			case "css-import": {
+				const sources = new Map();
+				sources.set(
+					"css-import",
+					new RawSource(`@import url(${JSON.stringify(request)});`)
+				);
+				return {
+					sources,
+					runtimeRequirements: EMPTY_RUNTIME_REQUIREMENTS
+				};
+			}
+			default: {
+				const sourceData = this._getSourceData(
+					request,
+					externalType,
+					runtimeTemplate,
+					moduleGraph,
+					chunkGraph,
+					runtime
+				);
+
+				let sourceString = sourceData.expression;
+				if (sourceData.iife)
+					sourceString = `(function() { return ${sourceString}; }())`;
+				if (concatenationScope) {
+					sourceString = `${
+						runtimeTemplate.supportsConst() ? "const" : "var"
+					} ${ConcatenationScope.NAMESPACE_OBJECT_EXPORT} = ${sourceString};`;
+					concatenationScope.registerNamespaceExport(
+						ConcatenationScope.NAMESPACE_OBJECT_EXPORT
+					);
+				} else {
+					sourceString = `module.exports = ${sourceString};`;
+				}
+				if (sourceData.init)
+					sourceString = `${sourceData.init}\n${sourceString}`;
+
+				let data = undefined;
+				if (sourceData.chunkInitFragments) {
+					data = new Map();
+					data.set("chunkInitFragments", sourceData.chunkInitFragments);
+				}
+
+				const sources = new Map();
+				if (this.useSourceMap || this.useSimpleSourceMap) {
+					sources.set(
+						"javascript",
+						new OriginalSource(sourceString, this.identifier())
+					);
+				} else {
+					sources.set("javascript", new RawSource(sourceString));
+				}
+
+				let runtimeRequirements = sourceData.runtimeRequirements;
+				if (!concatenationScope) {
+					if (!runtimeRequirements) {
+						runtimeRequirements = RUNTIME_REQUIREMENTS;
+					} else {
+						const set = new Set(runtimeRequirements);
+						set.add(RuntimeGlobals.module);
+						runtimeRequirements = set;
+					}
+				}
+
+				return {
+					sources,
+					runtimeRequirements:
+						runtimeRequirements || EMPTY_RUNTIME_REQUIREMENTS,
+					data
+				};
+			}
+		}
+	}
+
+	/**
+	 * @param {string=} type the source type for which the size should be estimated
+	 * @returns {number} the estimated size of the module (must be non-zero)
+	 */
+	size(type) {
+		return 42;
+	}
+
+	/**
+	 * @param {Hash} hash the hash used to track dependencies
+	 * @param {UpdateHashContext} context context
+	 * @returns {void}
+	 */
+	updateHash(hash, context) {
+		const { chunkGraph } = context;
+		hash.update(
+			`${this.externalType}${JSON.stringify(this.request)}${this.isOptional(
+				chunkGraph.moduleGraph
+			)}`
+		);
+		super.updateHash(hash, context);
+	}
+
+	/**
+	 * @param {ObjectSerializerContext} context context
+	 */
+	serialize(context) {
+		const { write } = context;
+
+		write(this.request);
+		write(this.externalType);
+		write(this.userRequest);
+
+		super.serialize(context);
+	}
+
+	/**
+	 * @param {ObjectDeserializerContext} context context
+	 */
+	deserialize(context) {
+		const { read } = context;
+
+		this.request = read();
+		this.externalType = read();
+		this.userRequest = read();
+
+		super.deserialize(context);
+	}
+}
+
+makeSerializable(ExternalModule, "webpack/lib/ExternalModule");
+
+module.exports = ExternalModule;