code:
/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Tobias Koppers @sokra
*/

"use strict";

const { equals } = require("./util/ArrayHelpers");
const SortableSet = require("./util/SortableSet");
const makeSerializable = require("./util/makeSerializable");
const { forEachRuntime } = require("./util/runtime");

/** @typedef {import("./Dependency").RuntimeSpec} RuntimeSpec */
/** @typedef {import("./Module")} Module */
/** @typedef {import("./ModuleGraph")} ModuleGraph */
/** @typedef {import("./ModuleGraphConnection")} ModuleGraphConnection */
/** @typedef {import("./serialization/ObjectMiddleware").ObjectDeserializerContext} ObjectDeserializerContext */
/** @typedef {import("./serialization/ObjectMiddleware").ObjectSerializerContext} ObjectSerializerContext */
/** @typedef {import("./util/Hash")} Hash */

/** @typedef {typeof UsageState.OnlyPropertiesUsed | typeof UsageState.NoInfo | typeof UsageState.Unknown | typeof UsageState.Used} RuntimeUsageStateType */
/** @typedef {typeof UsageState.Unused | RuntimeUsageStateType} UsageStateType */

const UsageState = Object.freeze({
	Unused: /** @type {0} */ (0),
	OnlyPropertiesUsed: /** @type {1} */ (1),
	NoInfo: /** @type {2} */ (2),
	Unknown: /** @type {3} */ (3),
	Used: /** @type {4} */ (4)
});

const RETURNS_TRUE = () => true;

const CIRCULAR = Symbol("circular target");

class RestoreProvidedData {
	constructor(
		exports,
		otherProvided,
		otherCanMangleProvide,
		otherTerminalBinding
	) {
		this.exports = exports;
		this.otherProvided = otherProvided;
		this.otherCanMangleProvide = otherCanMangleProvide;
		this.otherTerminalBinding = otherTerminalBinding;
	}

	/**
	 * @param {ObjectSerializerContext} context context
	 */
	serialize({ write }) {
		write(this.exports);
		write(this.otherProvided);
		write(this.otherCanMangleProvide);
		write(this.otherTerminalBinding);
	}

	/**
	 * @param {ObjectDeserializerContext} context context
	 * @returns {RestoreProvidedData} RestoreProvidedData
	 */
	static deserialize({ read }) {
		return new RestoreProvidedData(read(), read(), read(), read());
	}
}

makeSerializable(
	RestoreProvidedData,
	"webpack/lib/ModuleGraph",
	"RestoreProvidedData"
);

class ExportsInfo {
	constructor() {
		/** @type {Map<string, ExportInfo>} */
		this._exports = new Map();
		this._otherExportsInfo = new ExportInfo(null);
		this._sideEffectsOnlyInfo = new ExportInfo("*side effects only*");
		this._exportsAreOrdered = false;
		/** @type {ExportsInfo=} */
		this._redirectTo = undefined;
	}

	/**
	 * @returns {Iterable<ExportInfo>} all owned exports in any order
	 */
	get ownedExports() {
		return this._exports.values();
	}

	/**
	 * @returns {Iterable<ExportInfo>} all owned exports in order
	 */
	get orderedOwnedExports() {
		if (!this._exportsAreOrdered) {
			this._sortExports();
		}
		return this._exports.values();
	}

	/**
	 * @returns {Iterable<ExportInfo>} all exports in any order
	 */
	get exports() {
		if (this._redirectTo !== undefined) {
			const map = new Map(this._redirectTo._exports);
			for (const [key, value] of this._exports) {
				map.set(key, value);
			}
			return map.values();
		}
		return this._exports.values();
	}

	/**
	 * @returns {Iterable<ExportInfo>} all exports in order
	 */
	get orderedExports() {
		if (!this._exportsAreOrdered) {
			this._sortExports();
		}
		if (this._redirectTo !== undefined) {
			const map = new Map(
				Array.from(this._redirectTo.orderedExports, item => [item.name, item])
			);
			for (const [key, value] of this._exports) {
				map.set(key, value);
			}
			// sorting should be pretty fast as map contains
			// a lot of presorted items
			this._sortExportsMap(map);
			return map.values();
		}
		return this._exports.values();
	}

	/**
	 * @returns {ExportInfo} the export info of unlisted exports
	 */
	get otherExportsInfo() {
		if (this._redirectTo !== undefined)
			return this._redirectTo.otherExportsInfo;
		return this._otherExportsInfo;
	}

	_sortExportsMap(exports) {
		if (exports.size > 1) {
			const namesInOrder = [];
			for (const entry of exports.values()) {
				namesInOrder.push(entry.name);
			}
			namesInOrder.sort();
			let i = 0;
			for (const entry of exports.values()) {
				const name = namesInOrder[i];
				if (entry.name !== name) break;
				i++;
			}
			for (; i < namesInOrder.length; i++) {
				const name = namesInOrder[i];
				const correctEntry = exports.get(name);
				exports.delete(name);
				exports.set(name, correctEntry);
			}
		}
	}

	_sortExports() {
		this._sortExportsMap(this._exports);
		this._exportsAreOrdered = true;
	}

	/**
	 * @param {ExportsInfo | undefined} exportsInfo exports info
	 * @returns {boolean} result
	 */
	setRedirectNamedTo(exportsInfo) {
		if (this._redirectTo === exportsInfo) return false;
		this._redirectTo = exportsInfo;
		return true;
	}

	setHasProvideInfo() {
		for (const exportInfo of this._exports.values()) {
			if (exportInfo.provided === undefined) {
				exportInfo.provided = false;
			}
			if (exportInfo.canMangleProvide === undefined) {
				exportInfo.canMangleProvide = true;
			}
		}
		if (this._redirectTo !== undefined) {
			this._redirectTo.setHasProvideInfo();
		} else {
			if (this._otherExportsInfo.provided === undefined) {
				this._otherExportsInfo.provided = false;
			}
			if (this._otherExportsInfo.canMangleProvide === undefined) {
				this._otherExportsInfo.canMangleProvide = true;
			}
		}
	}

	setHasUseInfo() {
		for (const exportInfo of this._exports.values()) {
			exportInfo.setHasUseInfo();
		}
		this._sideEffectsOnlyInfo.setHasUseInfo();
		if (this._redirectTo !== undefined) {
			this._redirectTo.setHasUseInfo();
		} else {
			this._otherExportsInfo.setHasUseInfo();
		}
	}

	/**
	 * @param {string} name export name
	 * @returns {ExportInfo} export info for this name
	 */
	getOwnExportInfo(name) {
		const info = this._exports.get(name);
		if (info !== undefined) return info;
		const newInfo = new ExportInfo(name, this._otherExportsInfo);
		this._exports.set(name, newInfo);
		this._exportsAreOrdered = false;
		return newInfo;
	}

	/**
	 * @param {string} name export name
	 * @returns {ExportInfo} export info for this name
	 */
	getExportInfo(name) {
		const info = this._exports.get(name);
		if (info !== undefined) return info;
		if (this._redirectTo !== undefined)
			return this._redirectTo.getExportInfo(name);
		const newInfo = new ExportInfo(name, this._otherExportsInfo);
		this._exports.set(name, newInfo);
		this._exportsAreOrdered = false;
		return newInfo;
	}

	/**
	 * @param {string} name export name
	 * @returns {ExportInfo} export info for this name
	 */
	getReadOnlyExportInfo(name) {
		const info = this._exports.get(name);
		if (info !== undefined) return info;
		if (this._redirectTo !== undefined)
			return this._redirectTo.getReadOnlyExportInfo(name);
		return this._otherExportsInfo;
	}

	/**
	 * @param {string[]} name export name
	 * @returns {ExportInfo | undefined} export info for this name
	 */
	getReadOnlyExportInfoRecursive(name) {
		const exportInfo = this.getReadOnlyExportInfo(name[0]);
		if (name.length === 1) return exportInfo;
		if (!exportInfo.exportsInfo) return undefined;
		return exportInfo.exportsInfo.getReadOnlyExportInfoRecursive(name.slice(1));
	}

	/**
	 * @param {string[]=} name the export name
	 * @returns {ExportsInfo | undefined} the nested exports info
	 */
	getNestedExportsInfo(name) {
		if (Array.isArray(name) && name.length > 0) {
			const info = this.getReadOnlyExportInfo(name[0]);
			if (!info.exportsInfo) return undefined;
			return info.exportsInfo.getNestedExportsInfo(name.slice(1));
		}
		return this;
	}

	/**
	 * @param {boolean=} canMangle true, if exports can still be mangled (defaults to false)
	 * @param {Set<string>=} excludeExports list of unaffected exports
	 * @param {any=} targetKey use this as key for the target
	 * @param {ModuleGraphConnection=} targetModule set this module as target
	 * @param {number=} priority priority
	 * @returns {boolean} true, if this call changed something
	 */
	setUnknownExportsProvided(
		canMangle,
		excludeExports,
		targetKey,
		targetModule,
		priority
	) {
		let changed = false;
		if (excludeExports) {
			for (const name of excludeExports) {
				// Make sure these entries exist, so they can get different info
				this.getExportInfo(name);
			}
		}
		for (const exportInfo of this._exports.values()) {
			if (!canMangle && exportInfo.canMangleProvide !== false) {
				exportInfo.canMangleProvide = false;
				changed = true;
			}
			if (excludeExports && excludeExports.has(exportInfo.name)) continue;
			if (exportInfo.provided !== true && exportInfo.provided !== null) {
				exportInfo.provided = null;
				changed = true;
			}
			if (targetKey) {
				exportInfo.setTarget(
					targetKey,
					/** @type {ModuleGraphConnection} */ (targetModule),
					[exportInfo.name],
					-1
				);
			}
		}
		if (this._redirectTo !== undefined) {
			if (
				this._redirectTo.setUnknownExportsProvided(
					canMangle,
					excludeExports,
					targetKey,
					targetModule,
					priority
				)
			) {
				changed = true;
			}
		} else {
			if (
				this._otherExportsInfo.provided !== true &&
				this._otherExportsInfo.provided !== null
			) {
				this._otherExportsInfo.provided = null;
				changed = true;
			}
			if (!canMangle && this._otherExportsInfo.canMangleProvide !== false) {
				this._otherExportsInfo.canMangleProvide = false;
				changed = true;
			}
			if (targetKey) {
				this._otherExportsInfo.setTarget(
					targetKey,
					/** @type {ModuleGraphConnection} */ (targetModule),
					undefined,
					priority
				);
			}
		}
		return changed;
	}

	/**
	 * @param {RuntimeSpec} runtime the runtime
	 * @returns {boolean} true, when something changed
	 */
	setUsedInUnknownWay(runtime) {
		let changed = false;
		for (const exportInfo of this._exports.values()) {
			if (exportInfo.setUsedInUnknownWay(runtime)) {
				changed = true;
			}
		}
		if (this._redirectTo !== undefined) {
			if (this._redirectTo.setUsedInUnknownWay(runtime)) {
				changed = true;
			}
		} else {
			if (
				this._otherExportsInfo.setUsedConditionally(
					used => used < UsageState.Unknown,
					UsageState.Unknown,
					runtime
				)
			) {
				changed = true;
			}
			if (this._otherExportsInfo.canMangleUse !== false) {
				this._otherExportsInfo.canMangleUse = false;
				changed = true;
			}
		}
		return changed;
	}

	/**
	 * @param {RuntimeSpec} runtime the runtime
	 * @returns {boolean} true, when something changed
	 */
	setUsedWithoutInfo(runtime) {
		let changed = false;
		for (const exportInfo of this._exports.values()) {
			if (exportInfo.setUsedWithoutInfo(runtime)) {
				changed = true;
			}
		}
		if (this._redirectTo !== undefined) {
			if (this._redirectTo.setUsedWithoutInfo(runtime)) {
				changed = true;
			}
		} else {
			if (this._otherExportsInfo.setUsed(UsageState.NoInfo, runtime)) {
				changed = true;
			}
			if (this._otherExportsInfo.canMangleUse !== false) {
				this._otherExportsInfo.canMangleUse = false;
				changed = true;
			}
		}
		return changed;
	}

	/**
	 * @param {RuntimeSpec} runtime the runtime
	 * @returns {boolean} true, when something changed
	 */
	setAllKnownExportsUsed(runtime) {
		let changed = false;
		for (const exportInfo of this._exports.values()) {
			if (!exportInfo.provided) continue;
			if (exportInfo.setUsed(UsageState.Used, runtime)) {
				changed = true;
			}
		}
		return changed;
	}

	/**
	 * @param {RuntimeSpec} runtime the runtime
	 * @returns {boolean} true, when something changed
	 */
	setUsedForSideEffectsOnly(runtime) {
		return this._sideEffectsOnlyInfo.setUsedConditionally(
			used => used === UsageState.Unused,
			UsageState.Used,
			runtime
		);
	}

	/**
	 * @param {RuntimeSpec} runtime the runtime
	 * @returns {boolean} true, when the module exports are used in any way
	 */
	isUsed(runtime) {
		if (this._redirectTo !== undefined) {
			if (this._redirectTo.isUsed(runtime)) {
				return true;
			}
		} else {
			if (this._otherExportsInfo.getUsed(runtime) !== UsageState.Unused) {
				return true;
			}
		}
		for (const exportInfo of this._exports.values()) {
			if (exportInfo.getUsed(runtime) !== UsageState.Unused) {
				return true;
			}
		}
		return false;
	}

	/**
	 * @param {RuntimeSpec} runtime the runtime
	 * @returns {boolean} true, when the module is used in any way
	 */
	isModuleUsed(runtime) {
		if (this.isUsed(runtime)) return true;
		if (this._sideEffectsOnlyInfo.getUsed(runtime) !== UsageState.Unused)
			return true;
		return false;
	}

	/**
	 * @param {RuntimeSpec} runtime the runtime
	 * @returns {SortableSet<string> | boolean | null} set of used exports, or true (when namespace object is used), or false (when unused), or null (when unknown)
	 */
	getUsedExports(runtime) {
		// eslint-disable-next-line no-constant-binary-expression
		if (!this._redirectTo !== undefined) {
			switch (this._otherExportsInfo.getUsed(runtime)) {
				case UsageState.NoInfo:
					return null;
				case UsageState.Unknown:
				case UsageState.OnlyPropertiesUsed:
				case UsageState.Used:
					return true;
			}
		}
		const array = [];
		if (!this._exportsAreOrdered) this._sortExports();
		for (const exportInfo of this._exports.values()) {
			switch (exportInfo.getUsed(runtime)) {
				case UsageState.NoInfo:
					return null;
				case UsageState.Unknown:
					return true;
				case UsageState.OnlyPropertiesUsed:
				case UsageState.Used:
					array.push(exportInfo.name);
			}
		}
		if (this._redirectTo !== undefined) {
			const inner = this._redirectTo.getUsedExports(runtime);
			if (inner === null) return null;
			if (inner === true) return true;
			if (inner !== false) {
				for (const item of inner) {
					array.push(item);
				}
			}
		}
		if (array.length === 0) {
			switch (this._sideEffectsOnlyInfo.getUsed(runtime)) {
				case UsageState.NoInfo:
					return null;
				case UsageState.Unused:
					return false;
			}
		}
		return new SortableSet(array);
	}

	/**
	 * @returns {null | true | string[]} list of exports when known
	 */
	getProvidedExports() {
		// eslint-disable-next-line no-constant-binary-expression
		if (!this._redirectTo !== undefined) {
			switch (this._otherExportsInfo.provided) {
				case undefined:
					return null;
				case null:
					return true;
				case true:
					return true;
			}
		}
		const array = [];
		if (!this._exportsAreOrdered) this._sortExports();
		for (const exportInfo of this._exports.values()) {
			switch (exportInfo.provided) {
				case undefined:
					return null;
				case null:
					return true;
				case true:
					array.push(exportInfo.name);
			}
		}
		if (this._redirectTo !== undefined) {
			const inner = this._redirectTo.getProvidedExports();
			if (inner === null) return null;
			if (inner === true) return true;
			for (const item of inner) {
				if (!array.includes(item)) {
					array.push(item);
				}
			}
		}
		return array;
	}

	/**
	 * @param {RuntimeSpec} runtime the runtime
	 * @returns {ExportInfo[]} exports that are relevant (not unused and potential provided)
	 */
	getRelevantExports(runtime) {
		const list = [];
		for (const exportInfo of this._exports.values()) {
			const used = exportInfo.getUsed(runtime);
			if (used === UsageState.Unused) continue;
			if (exportInfo.provided === false) continue;
			list.push(exportInfo);
		}
		if (this._redirectTo !== undefined) {
			for (const exportInfo of this._redirectTo.getRelevantExports(runtime)) {
				if (!this._exports.has(exportInfo.name)) list.push(exportInfo);
			}
		}
		if (
			this._otherExportsInfo.provided !== false &&
			this._otherExportsInfo.getUsed(runtime) !== UsageState.Unused
		) {
			list.push(this._otherExportsInfo);
		}
		return list;
	}

	/**
	 * @param {string | string[]} name the name of the export
	 * @returns {boolean | undefined | null} if the export is provided
	 */
	isExportProvided(name) {
		if (Array.isArray(name)) {
			const info = this.getReadOnlyExportInfo(name[0]);
			if (info.exportsInfo && name.length > 1) {
				return info.exportsInfo.isExportProvided(name.slice(1));
			}
			return info.provided ? name.length === 1 || undefined : info.provided;
		}
		const info = this.getReadOnlyExportInfo(name);
		return info.provided;
	}

	/**
	 * @param {RuntimeSpec} runtime runtime
	 * @returns {string} key representing the usage
	 */
	getUsageKey(runtime) {
		const key = [];
		if (this._redirectTo !== undefined) {
			key.push(this._redirectTo.getUsageKey(runtime));
		} else {
			key.push(this._otherExportsInfo.getUsed(runtime));
		}
		key.push(this._sideEffectsOnlyInfo.getUsed(runtime));
		for (const exportInfo of this.orderedOwnedExports) {
			key.push(exportInfo.getUsed(runtime));
		}
		return key.join("|");
	}

	/**
	 * @param {RuntimeSpec} runtimeA first runtime
	 * @param {RuntimeSpec} runtimeB second runtime
	 * @returns {boolean} true, when equally used
	 */
	isEquallyUsed(runtimeA, runtimeB) {
		if (this._redirectTo !== undefined) {
			if (!this._redirectTo.isEquallyUsed(runtimeA, runtimeB)) return false;
		} else {
			if (
				this._otherExportsInfo.getUsed(runtimeA) !==
				this._otherExportsInfo.getUsed(runtimeB)
			) {
				return false;
			}
		}
		if (
			this._sideEffectsOnlyInfo.getUsed(runtimeA) !==
			this._sideEffectsOnlyInfo.getUsed(runtimeB)
		) {
			return false;
		}
		for (const exportInfo of this.ownedExports) {
			if (exportInfo.getUsed(runtimeA) !== exportInfo.getUsed(runtimeB))
				return false;
		}
		return true;
	}

	/**
	 * @param {string | string[]} name export name
	 * @param {RuntimeSpec} runtime check usage for this runtime only
	 * @returns {UsageStateType} usage status
	 */
	getUsed(name, runtime) {
		if (Array.isArray(name)) {
			if (name.length === 0) return this.otherExportsInfo.getUsed(runtime);
			let info = this.getReadOnlyExportInfo(name[0]);
			if (info.exportsInfo && name.length > 1) {
				return info.exportsInfo.getUsed(name.slice(1), runtime);
			}
			return info.getUsed(runtime);
		}
		let info = this.getReadOnlyExportInfo(name);
		return info.getUsed(runtime);
	}

	/**
	 * @param {string | string[] | undefined} name the export name
	 * @param {RuntimeSpec} runtime check usage for this runtime only
	 * @returns {string | string[] | false} the used name
	 */
	getUsedName(name, runtime) {
		if (Array.isArray(name)) {
			// TODO improve this
			if (name.length === 0) {
				if (!this.isUsed(runtime)) return false;
				return name;
			}
			let info = this.getReadOnlyExportInfo(name[0]);
			const x = info.getUsedName(name[0], runtime);
			if (x === false) return false;
			const arr = x === name[0] && name.length === 1 ? name : [x];
			if (name.length === 1) {
				return arr;
			}
			if (
				info.exportsInfo &&
				info.getUsed(runtime) === UsageState.OnlyPropertiesUsed
			) {
				const nested = info.exportsInfo.getUsedName(name.slice(1), runtime);
				if (!nested) return false;
				return arr.concat(nested);
			} else {
				return arr.concat(name.slice(1));
			}
		} else {
			let info = this.getReadOnlyExportInfo(name);
			const usedName = info.getUsedName(name, runtime);
			return usedName;
		}
	}

	/**
	 * @param {Hash} hash the hash
	 * @param {RuntimeSpec} runtime the runtime
	 * @returns {void}
	 */
	updateHash(hash, runtime) {
		this._updateHash(hash, runtime, new Set());
	}

	/**
	 * @param {Hash} hash the hash
	 * @param {RuntimeSpec} runtime the runtime
	 * @param {Set<ExportsInfo>} alreadyVisitedExportsInfo for circular references
	 * @returns {void}
	 */
	_updateHash(hash, runtime, alreadyVisitedExportsInfo) {
		const set = new Set(alreadyVisitedExportsInfo);
		set.add(this);
		for (const exportInfo of this.orderedExports) {
			if (exportInfo.hasInfo(this._otherExportsInfo, runtime)) {
				exportInfo._updateHash(hash, runtime, set);
			}
		}
		this._sideEffectsOnlyInfo._updateHash(hash, runtime, set);
		this._otherExportsInfo._updateHash(hash, runtime, set);
		if (this._redirectTo !== undefined) {
			this._redirectTo._updateHash(hash, runtime, set);
		}
	}

	getRestoreProvidedData() {
		const otherProvided = this._otherExportsInfo.provided;
		const otherCanMangleProvide = this._otherExportsInfo.canMangleProvide;
		const otherTerminalBinding = this._otherExportsInfo.terminalBinding;
		const exports = [];
		for (const exportInfo of this.orderedExports) {
			if (
				exportInfo.provided !== otherProvided ||
				exportInfo.canMangleProvide !== otherCanMangleProvide ||
				exportInfo.terminalBinding !== otherTerminalBinding ||
				exportInfo.exportsInfoOwned
			) {
				exports.push({
					name: exportInfo.name,
					provided: exportInfo.provided,
					canMangleProvide: exportInfo.canMangleProvide,
					terminalBinding: exportInfo.terminalBinding,
					exportsInfo: exportInfo.exportsInfoOwned
						? exportInfo.exportsInfo.getRestoreProvidedData()
						: undefined
				});
			}
		}
		return new RestoreProvidedData(
			exports,
			otherProvided,
			otherCanMangleProvide,
			otherTerminalBinding
		);
	}

	/**
	 * @param {{ otherProvided: any, otherCanMangleProvide: any, otherTerminalBinding: any, exports: any }} data data
	 */
	restoreProvided({
		otherProvided,
		otherCanMangleProvide,
		otherTerminalBinding,
		exports
	}) {
		let wasEmpty = true;
		for (const exportInfo of this._exports.values()) {
			wasEmpty = false;
			exportInfo.provided = otherProvided;
			exportInfo.canMangleProvide = otherCanMangleProvide;
			exportInfo.terminalBinding = otherTerminalBinding;
		}
		this._otherExportsInfo.provided = otherProvided;
		this._otherExportsInfo.canMangleProvide = otherCanMangleProvide;
		this._otherExportsInfo.terminalBinding = otherTerminalBinding;
		for (const exp of exports) {
			const exportInfo = this.getExportInfo(exp.name);
			exportInfo.provided = exp.provided;
			exportInfo.canMangleProvide = exp.canMangleProvide;
			exportInfo.terminalBinding = exp.terminalBinding;
			if (exp.exportsInfo) {
				const exportsInfo = exportInfo.createNestedExportsInfo();
				exportsInfo.restoreProvided(exp.exportsInfo);
			}
		}
		if (wasEmpty) this._exportsAreOrdered = true;
	}
}

class ExportInfo {
	/**
	 * @param {string} name the original name of the export
	 * @param {ExportInfo=} initFrom init values from this ExportInfo
	 */
	constructor(name, initFrom) {
		/** @type {string} */
		this.name = name;
		/**
		 * @private
		 * @type {string | null}
		 */
		this._usedName = initFrom ? initFrom._usedName : null;
		/**
		 * @private
		 * @type {UsageStateType}
		 */
		this._globalUsed = initFrom ? initFrom._globalUsed : undefined;
		/**
		 * @private
		 * @type {Map<string, RuntimeUsageStateType>}
		 */
		this._usedInRuntime =
			initFrom && initFrom._usedInRuntime
				? new Map(initFrom._usedInRuntime)
				: undefined;
		/**
		 * @private
		 * @type {boolean}
		 */
		this._hasUseInRuntimeInfo = initFrom
			? initFrom._hasUseInRuntimeInfo
			: false;
		/**
		 * true: it is provided
		 * false: it is not provided
		 * null: only the runtime knows if it is provided
		 * undefined: it was not determined if it is provided
		 * @type {boolean | null | undefined}
		 */
		this.provided = initFrom ? initFrom.provided : undefined;
		/**
		 * is the export a terminal binding that should be checked for export star conflicts
		 * @type {boolean}
		 */
		this.terminalBinding = initFrom ? initFrom.terminalBinding : false;
		/**
		 * true: it can be mangled
		 * false: is can not be mangled
		 * undefined: it was not determined if it can be mangled
		 * @type {boolean | undefined}
		 */
		this.canMangleProvide = initFrom ? initFrom.canMangleProvide : undefined;
		/**
		 * true: it can be mangled
		 * false: is can not be mangled
		 * undefined: it was not determined if it can be mangled
		 * @type {boolean | undefined}
		 */
		this.canMangleUse = initFrom ? initFrom.canMangleUse : undefined;
		/** @type {boolean} */
		this.exportsInfoOwned = false;
		/** @type {ExportsInfo=} */
		this.exportsInfo = undefined;
		/** @type {Map<any, { connection: ModuleGraphConnection | null, export: string[], priority: number }>=} */
		this._target = undefined;
		if (initFrom && initFrom._target) {
			this._target = new Map();
			for (const [key, value] of initFrom._target) {
				this._target.set(key, {
					connection: value.connection,
					export: value.export || [name],
					priority: value.priority
				});
			}
		}
		/** @type {Map<any, { connection: ModuleGraphConnection | null, export: string[], priority: number }>=} */
		this._maxTarget = undefined;
	}

	// TODO webpack 5 remove
	/** @private */
	get used() {
		throw new Error("REMOVED");
	}
	/** @private */
	get usedName() {
		throw new Error("REMOVED");
	}
	/**
	 * @private
	 * @param {*} v v
	 */
	set used(v) {
		throw new Error("REMOVED");
	}
	/**
	 * @private
	 * @param {*} v v
	 */
	set usedName(v) {
		throw new Error("REMOVED");
	}

	get canMangle() {
		switch (this.canMangleProvide) {
			case undefined:
				return this.canMangleUse === false ? false : undefined;
			case false:
				return false;
			case true:
				switch (this.canMangleUse) {
					case undefined:
						return undefined;
					case false:
						return false;
					case true:
						return true;
				}
		}
		throw new Error(
			`Unexpected flags for canMangle ${this.canMangleProvide} ${this.canMangleUse}`
		);
	}

	/**
	 * @param {RuntimeSpec} runtime only apply to this runtime
	 * @returns {boolean} true, when something changed
	 */
	setUsedInUnknownWay(runtime) {
		let changed = false;
		if (
			this.setUsedConditionally(
				used => used < UsageState.Unknown,
				UsageState.Unknown,
				runtime
			)
		) {
			changed = true;
		}
		if (this.canMangleUse !== false) {
			this.canMangleUse = false;
			changed = true;
		}
		return changed;
	}

	/**
	 * @param {RuntimeSpec} runtime only apply to this runtime
	 * @returns {boolean} true, when something changed
	 */
	setUsedWithoutInfo(runtime) {
		let changed = false;
		if (this.setUsed(UsageState.NoInfo, runtime)) {
			changed = true;
		}
		if (this.canMangleUse !== false) {
			this.canMangleUse = false;
			changed = true;
		}
		return changed;
	}

	setHasUseInfo() {
		if (!this._hasUseInRuntimeInfo) {
			this._hasUseInRuntimeInfo = true;
		}
		if (this.canMangleUse === undefined) {
			this.canMangleUse = true;
		}
		if (this.exportsInfoOwned) {
			this.exportsInfo.setHasUseInfo();
		}
	}

	/**
	 * @param {function(UsageStateType): boolean} condition compare with old value
	 * @param {UsageStateType} newValue set when condition is true
	 * @param {RuntimeSpec} runtime only apply to this runtime
	 * @returns {boolean} true when something has changed
	 */
	setUsedConditionally(condition, newValue, runtime) {
		if (runtime === undefined) {
			if (this._globalUsed === undefined) {
				this._globalUsed = newValue;
				return true;
			} else {
				if (this._globalUsed !== newValue && condition(this._globalUsed)) {
					this._globalUsed = newValue;
					return true;
				}
			}
		} else if (this._usedInRuntime === undefined) {
			if (newValue !== UsageState.Unused && condition(UsageState.Unused)) {
				this._usedInRuntime = new Map();
				forEachRuntime(runtime, runtime =>
					this._usedInRuntime.set(runtime, newValue)
				);
				return true;
			}
		} else {
			let changed = false;
			forEachRuntime(runtime, runtime => {
				/** @type {UsageStateType} */
				let oldValue = this._usedInRuntime.get(runtime);
				if (oldValue === undefined) oldValue = UsageState.Unused;
				if (newValue !== oldValue && condition(oldValue)) {
					if (newValue === UsageState.Unused) {
						this._usedInRuntime.delete(runtime);
					} else {
						this._usedInRuntime.set(runtime, newValue);
					}
					changed = true;
				}
			});
			if (changed) {
				if (this._usedInRuntime.size === 0) this._usedInRuntime = undefined;
				return true;
			}
		}
		return false;
	}

	/**
	 * @param {UsageStateType} newValue new value of the used state
	 * @param {RuntimeSpec} runtime only apply to this runtime
	 * @returns {boolean} true when something has changed
	 */
	setUsed(newValue, runtime) {
		if (runtime === undefined) {
			if (this._globalUsed !== newValue) {
				this._globalUsed = newValue;
				return true;
			}
		} else if (this._usedInRuntime === undefined) {
			if (newValue !== UsageState.Unused) {
				this._usedInRuntime = new Map();
				forEachRuntime(runtime, runtime =>
					this._usedInRuntime.set(runtime, newValue)
				);
				return true;
			}
		} else {
			let changed = false;
			forEachRuntime(runtime, runtime => {
				/** @type {UsageStateType} */
				let oldValue = this._usedInRuntime.get(runtime);
				if (oldValue === undefined) oldValue = UsageState.Unused;
				if (newValue !== oldValue) {
					if (newValue === UsageState.Unused) {
						this._usedInRuntime.delete(runtime);
					} else {
						this._usedInRuntime.set(runtime, newValue);
					}
					changed = true;
				}
			});
			if (changed) {
				if (this._usedInRuntime.size === 0) this._usedInRuntime = undefined;
				return true;
			}
		}
		return false;
	}

	/**
	 * @param {any} key the key
	 * @returns {boolean} true, if something has changed
	 */
	unsetTarget(key) {
		if (!this._target) return false;
		if (this._target.delete(key)) {
			this._maxTarget = undefined;
			return true;
		}
		return false;
	}

	/**
	 * @param {any} key the key
	 * @param {ModuleGraphConnection} connection the target module if a single one
	 * @param {string[]=} exportName the exported name
	 * @param {number=} priority priority
	 * @returns {boolean} true, if something has changed
	 */
	setTarget(key, connection, exportName, priority = 0) {
		if (exportName) exportName = [...exportName];
		if (!this._target) {
			this._target = new Map();
			this._target.set(key, { connection, export: exportName, priority });
			return true;
		}
		const oldTarget = this._target.get(key);
		if (!oldTarget) {
			if (oldTarget === null && !connection) return false;
			this._target.set(key, { connection, export: exportName, priority });
			this._maxTarget = undefined;
			return true;
		}
		if (
			oldTarget.connection !== connection ||
			oldTarget.priority !== priority ||
			(exportName
				? !oldTarget.export || !equals(oldTarget.export, exportName)
				: oldTarget.export)
		) {
			oldTarget.connection = connection;
			oldTarget.export = exportName;
			oldTarget.priority = priority;
			this._maxTarget = undefined;
			return true;
		}
		return false;
	}

	/**
	 * @param {RuntimeSpec} runtime for this runtime
	 * @returns {UsageStateType} usage state
	 */
	getUsed(runtime) {
		if (!this._hasUseInRuntimeInfo) return UsageState.NoInfo;
		if (this._globalUsed !== undefined) return this._globalUsed;
		if (this._usedInRuntime === undefined) {
			return UsageState.Unused;
		} else if (typeof runtime === "string") {
			const value = this._usedInRuntime.get(runtime);
			return value === undefined ? UsageState.Unused : value;
		} else if (runtime === undefined) {
			/** @type {UsageStateType} */
			let max = UsageState.Unused;
			for (const value of this._usedInRuntime.values()) {
				if (value === UsageState.Used) {
					return UsageState.Used;
				}
				if (max < value) max = value;
			}
			return max;
		} else {
			/** @type {UsageStateType} */
			let max = UsageState.Unused;
			for (const item of runtime) {
				const value = this._usedInRuntime.get(item);
				if (value !== undefined) {
					if (value === UsageState.Used) {
						return UsageState.Used;
					}
					if (max < value) max = value;
				}
			}
			return max;
		}
	}

	/**
	 * get used name
	 * @param {string | undefined} fallbackName fallback name for used exports with no name
	 * @param {RuntimeSpec} runtime check usage for this runtime only
	 * @returns {string | false} used name
	 */
	getUsedName(fallbackName, runtime) {
		if (this._hasUseInRuntimeInfo) {
			if (this._globalUsed !== undefined) {
				if (this._globalUsed === UsageState.Unused) return false;
			} else {
				if (this._usedInRuntime === undefined) return false;
				if (typeof runtime === "string") {
					if (!this._usedInRuntime.has(runtime)) {
						return false;
					}
				} else if (runtime !== undefined) {
					if (
						Array.from(runtime).every(
							runtime => !this._usedInRuntime.has(runtime)
						)
					) {
						return false;
					}
				}
			}
		}
		if (this._usedName !== null) return this._usedName;
		return this.name || fallbackName;
	}

	/**
	 * @returns {boolean} true, when a mangled name of this export is set
	 */
	hasUsedName() {
		return this._usedName !== null;
	}

	/**
	 * Sets the mangled name of this export
	 * @param {string} name the new name
	 * @returns {void}
	 */
	setUsedName(name) {
		this._usedName = name;
	}

	/**
	 * @param {ModuleGraph} moduleGraph the module graph
	 * @param {function({ module: Module, export: string[] | undefined }): boolean} resolveTargetFilter filter function to further resolve target
	 * @returns {ExportInfo | ExportsInfo | undefined} the terminal binding export(s) info if known
	 */
	getTerminalBinding(moduleGraph, resolveTargetFilter = RETURNS_TRUE) {
		if (this.terminalBinding) return this;
		const target = this.getTarget(moduleGraph, resolveTargetFilter);
		if (!target) return undefined;
		const exportsInfo = moduleGraph.getExportsInfo(target.module);
		if (!target.export) return exportsInfo;
		return exportsInfo.getReadOnlyExportInfoRecursive(target.export);
	}

	isReexport() {
		return !this.terminalBinding && this._target && this._target.size > 0;
	}

	_getMaxTarget() {
		if (this._maxTarget !== undefined) return this._maxTarget;
		if (this._target.size <= 1) return (this._maxTarget = this._target);
		let maxPriority = -Infinity;
		let minPriority = Infinity;
		for (const { priority } of this._target.values()) {
			if (maxPriority < priority) maxPriority = priority;
			if (minPriority > priority) minPriority = priority;
		}
		// This should be very common
		if (maxPriority === minPriority) return (this._maxTarget = this._target);

		// This is an edge case
		const map = new Map();
		for (const [key, value] of this._target) {
			if (maxPriority === value.priority) {
				map.set(key, value);
			}
		}
		this._maxTarget = map;
		return map;
	}

	/**
	 * @param {ModuleGraph} moduleGraph the module graph
	 * @param {function(Module): boolean} validTargetModuleFilter a valid target module
	 * @returns {{ module: Module, export: string[] | undefined } | undefined | false} the target, undefined when there is no target, false when no target is valid
	 */
	findTarget(moduleGraph, validTargetModuleFilter) {
		return this._findTarget(moduleGraph, validTargetModuleFilter, new Set());
	}

	/**
	 * @param {ModuleGraph} moduleGraph the module graph
	 * @param {function(Module): boolean} validTargetModuleFilter a valid target module
	 * @param {Set<ExportInfo>} alreadyVisited set of already visited export info to avoid circular references
	 * @returns {{ module: Module, export: string[] | undefined } | undefined | false} the target, undefined when there is no target, false when no target is valid
	 */
	_findTarget(moduleGraph, validTargetModuleFilter, alreadyVisited) {
		if (!this._target || this._target.size === 0) return undefined;
		let rawTarget = this._getMaxTarget().values().next().value;
		if (!rawTarget) return undefined;
		/** @type {{ module: Module, export: string[] | undefined }} */
		let target = {
			module: rawTarget.connection.module,
			export: rawTarget.export
		};
		for (;;) {
			if (validTargetModuleFilter(target.module)) return target;
			const exportsInfo = moduleGraph.getExportsInfo(target.module);
			const exportInfo = exportsInfo.getExportInfo(target.export[0]);
			if (alreadyVisited.has(exportInfo)) return null;
			const newTarget = exportInfo._findTarget(
				moduleGraph,
				validTargetModuleFilter,
				alreadyVisited
			);
			if (!newTarget) return false;
			if (target.export.length === 1) {
				target = newTarget;
			} else {
				target = {
					module: newTarget.module,
					export: newTarget.export
						? newTarget.export.concat(target.export.slice(1))
						: target.export.slice(1)
				};
			}
		}
	}

	/**
	 * @param {ModuleGraph} moduleGraph the module graph
	 * @param {function({ module: Module, export: string[] | undefined }): boolean} resolveTargetFilter filter function to further resolve target
	 * @returns {{ module: Module, export: string[] | undefined } | undefined} the target
	 */
	getTarget(moduleGraph, resolveTargetFilter = RETURNS_TRUE) {
		const result = this._getTarget(moduleGraph, resolveTargetFilter, undefined);
		if (result === CIRCULAR) return undefined;
		return result;
	}

	/**
	 * @param {ModuleGraph} moduleGraph the module graph
	 * @param {function({ module: Module, connection: ModuleGraphConnection, export: string[] | undefined }): boolean} resolveTargetFilter filter function to further resolve target
	 * @param {Set<ExportInfo> | undefined} alreadyVisited set of already visited export info to avoid circular references
	 * @returns {{ module: Module, connection: ModuleGraphConnection, export: string[] | undefined } | CIRCULAR | undefined} the target
	 */
	_getTarget(moduleGraph, resolveTargetFilter, alreadyVisited) {
		/**
		 * @param {{ connection: ModuleGraphConnection, export: string[] | undefined } | null} inputTarget unresolved target
		 * @param {Set<ExportInfo>} alreadyVisited set of already visited export info to avoid circular references
		 * @returns {{ module: Module, connection: ModuleGraphConnection, export: string[] | undefined } | CIRCULAR | null} resolved target
		 */
		const resolveTarget = (inputTarget, alreadyVisited) => {
			if (!inputTarget) return null;
			if (!inputTarget.export) {
				return {
					module: inputTarget.connection.module,
					connection: inputTarget.connection,
					export: undefined
				};
			}
			/** @type {{ module: Module, connection: ModuleGraphConnection, export: string[] | undefined }} */
			let target = {
				module: inputTarget.connection.module,
				connection: inputTarget.connection,
				export: inputTarget.export
			};
			if (!resolveTargetFilter(target)) return target;
			let alreadyVisitedOwned = false;
			for (;;) {
				const exportsInfo = moduleGraph.getExportsInfo(target.module);
				const exportInfo = exportsInfo.getExportInfo(target.export[0]);
				if (!exportInfo) return target;
				if (alreadyVisited.has(exportInfo)) return CIRCULAR;
				const newTarget = exportInfo._getTarget(
					moduleGraph,
					resolveTargetFilter,
					alreadyVisited
				);
				if (newTarget === CIRCULAR) return CIRCULAR;
				if (!newTarget) return target;
				if (target.export.length === 1) {
					target = newTarget;
					if (!target.export) return target;
				} else {
					target = {
						module: newTarget.module,
						connection: newTarget.connection,
						export: newTarget.export
							? newTarget.export.concat(target.export.slice(1))
							: target.export.slice(1)
					};
				}
				if (!resolveTargetFilter(target)) return target;
				if (!alreadyVisitedOwned) {
					alreadyVisited = new Set(alreadyVisited);
					alreadyVisitedOwned = true;
				}
				alreadyVisited.add(exportInfo);
			}
		};

		if (!this._target || this._target.size === 0) return undefined;
		if (alreadyVisited && alreadyVisited.has(this)) return CIRCULAR;
		const newAlreadyVisited = new Set(alreadyVisited);
		newAlreadyVisited.add(this);
		const values = this._getMaxTarget().values();
		const target = resolveTarget(values.next().value, newAlreadyVisited);
		if (target === CIRCULAR) return CIRCULAR;
		if (target === null) return undefined;
		let result = values.next();
		while (!result.done) {
			const t = resolveTarget(result.value, newAlreadyVisited);
			if (t === CIRCULAR) return CIRCULAR;
			if (t === null) return undefined;
			if (t.module !== target.module) return undefined;
			if (!t.export !== !target.export) return undefined;
			if (
				target.export &&
				!equals(/** @type {ArrayLike<string>} */ (t.export), target.export)
			)
				return undefined;
			result = values.next();
		}
		return target;
	}

	/**
	 * Move the target forward as long resolveTargetFilter is fulfilled
	 * @param {ModuleGraph} moduleGraph the module graph
	 * @param {function({ module: Module, export: string[] | undefined }): boolean} resolveTargetFilter filter function to further resolve target
	 * @param {function({ module: Module, export: string[] | undefined }): ModuleGraphConnection=} updateOriginalConnection updates the original connection instead of using the target connection
	 * @returns {{ module: Module, export: string[] | undefined } | undefined} the resolved target when moved
	 */
	moveTarget(moduleGraph, resolveTargetFilter, updateOriginalConnection) {
		const target = this._getTarget(moduleGraph, resolveTargetFilter, undefined);
		if (target === CIRCULAR) return undefined;
		if (!target) return undefined;
		const originalTarget = this._getMaxTarget().values().next().value;
		if (
			originalTarget.connection === target.connection &&
			originalTarget.export === target.export
		) {
			return undefined;
		}
		this._target.clear();
		this._target.set(undefined, {
			connection: updateOriginalConnection
				? updateOriginalConnection(target)
				: target.connection,
			export: target.export,
			priority: 0
		});
		return target;
	}

	createNestedExportsInfo() {
		if (this.exportsInfoOwned) return this.exportsInfo;
		this.exportsInfoOwned = true;
		const oldExportsInfo = this.exportsInfo;
		this.exportsInfo = new ExportsInfo();
		this.exportsInfo.setHasProvideInfo();
		if (oldExportsInfo) {
			this.exportsInfo.setRedirectNamedTo(oldExportsInfo);
		}
		return this.exportsInfo;
	}

	getNestedExportsInfo() {
		return this.exportsInfo;
	}

	hasInfo(baseInfo, runtime) {
		return (
			(this._usedName && this._usedName !== this.name) ||
			this.provided ||
			this.terminalBinding ||
			this.getUsed(runtime) !== baseInfo.getUsed(runtime)
		);
	}

	updateHash(hash, runtime) {
		this._updateHash(hash, runtime, new Set());
	}

	_updateHash(hash, runtime, alreadyVisitedExportsInfo) {
		hash.update(
			`${this._usedName || this.name}${this.getUsed(runtime)}${this.provided}${
				this.terminalBinding
			}`
		);
		if (this.exportsInfo && !alreadyVisitedExportsInfo.has(this.exportsInfo)) {
			this.exportsInfo._updateHash(hash, runtime, alreadyVisitedExportsInfo);
		}
	}

	getUsedInfo() {
		if (this._globalUsed !== undefined) {
			switch (this._globalUsed) {
				case UsageState.Unused:
					return "unused";
				case UsageState.NoInfo:
					return "no usage info";
				case UsageState.Unknown:
					return "maybe used (runtime-defined)";
				case UsageState.Used:
					return "used";
				case UsageState.OnlyPropertiesUsed:
					return "only properties used";
			}
		} else if (this._usedInRuntime !== undefined) {
			/** @type {Map<RuntimeUsageStateType, string[]>} */
			const map = new Map();
			for (const [runtime, used] of this._usedInRuntime) {
				const list = map.get(used);
				if (list !== undefined) list.push(runtime);
				else map.set(used, [runtime]);
			}
			const specificInfo = Array.from(map, ([used, runtimes]) => {
				switch (used) {
					case UsageState.NoInfo:
						return `no usage info in ${runtimes.join(", ")}`;
					case UsageState.Unknown:
						return `maybe used in ${runtimes.join(", ")} (runtime-defined)`;
					case UsageState.Used:
						return `used in ${runtimes.join(", ")}`;
					case UsageState.OnlyPropertiesUsed:
						return `only properties used in ${runtimes.join(", ")}`;
				}
			});
			if (specificInfo.length > 0) {
				return specificInfo.join("; ");
			}
		}
		return this._hasUseInRuntimeInfo ? "unused" : "no usage info";
	}

	getProvidedInfo() {
		switch (this.provided) {
			case undefined:
				return "no provided info";
			case null:
				return "maybe provided (runtime-defined)";
			case true:
				return "provided";
			case false:
				return "not provided";
		}
	}

	getRenameInfo() {
		if (this._usedName !== null && this._usedName !== this.name) {
			return `renamed to ${JSON.stringify(this._usedName).slice(1, -1)}`;
		}
		switch (this.canMangleProvide) {
			case undefined:
				switch (this.canMangleUse) {
					case undefined:
						return "missing provision and use info prevents renaming";
					case false:
						return "usage prevents renaming (no provision info)";
					case true:
						return "missing provision info prevents renaming";
				}
				break;
			case true:
				switch (this.canMangleUse) {
					case undefined:
						return "missing usage info prevents renaming";
					case false:
						return "usage prevents renaming";
					case true:
						return "could be renamed";
				}
				break;
			case false:
				switch (this.canMangleUse) {
					case undefined:
						return "provision prevents renaming (no use info)";
					case false:
						return "usage and provision prevents renaming";
					case true:
						return "provision prevents renaming";
				}
				break;
		}
		throw new Error(
			`Unexpected flags for getRenameInfo ${this.canMangleProvide} ${this.canMangleUse}`
		);
	}
}

module.exports = ExportsInfo;
module.exports.ExportInfo = ExportInfo;
module.exports.UsageState = UsageState;


code:
/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Tobias Koppers @sokra
*/

"use strict";

const {
	JAVASCRIPT_MODULE_TYPE_AUTO,
	JAVASCRIPT_MODULE_TYPE_DYNAMIC,
	JAVASCRIPT_MODULE_TYPE_ESM
} = require("./ModuleTypeConstants");
const ConstDependency = require("./dependencies/ConstDependency");
const ExportsInfoDependency = require("./dependencies/ExportsInfoDependency");

/** @typedef {import("./Compiler")} Compiler */
/** @typedef {import("./Dependency").DependencyLocation} DependencyLocation */
/** @typedef {import("./javascript/JavascriptParser")} JavascriptParser */
/** @typedef {import("./javascript/JavascriptParser").Range} Range */

const PLUGIN_NAME = "ExportsInfoApiPlugin";

class ExportsInfoApiPlugin {
	/**
	 * Apply the plugin
	 * @param {Compiler} compiler the compiler instance
	 * @returns {void}
	 */
	apply(compiler) {
		compiler.hooks.compilation.tap(
			PLUGIN_NAME,
			(compilation, { normalModuleFactory }) => {
				compilation.dependencyTemplates.set(
					ExportsInfoDependency,
					new ExportsInfoDependency.Template()
				);
				/**
				 * @param {JavascriptParser} parser the parser
				 * @returns {void}
				 */
				const handler = parser => {
					parser.hooks.expressionMemberChain
						.for("__webpack_exports_info__")
						.tap(PLUGIN_NAME, (expr, members) => {
							const dep =
								members.length >= 2
									? new ExportsInfoDependency(
											/** @type {Range} */ (expr.range),
											members.slice(0, -1),
											members[members.length - 1]
										)
									: new ExportsInfoDependency(
											/** @type {Range} */ (expr.range),
											null,
											members[0]
										);
							dep.loc = /** @type {DependencyLocation} */ (expr.loc);
							parser.state.module.addDependency(dep);
							return true;
						});
					parser.hooks.expression
						.for("__webpack_exports_info__")
						.tap(PLUGIN_NAME, expr => {
							const dep = new ConstDependency(
								"true",
								/** @type {Range} */ (expr.range)
							);
							dep.loc = /** @type {DependencyLocation} */ (expr.loc);
							parser.state.module.addPresentationalDependency(dep);
							return true;
						});
				};
				normalModuleFactory.hooks.parser
					.for(JAVASCRIPT_MODULE_TYPE_AUTO)
					.tap(PLUGIN_NAME, handler);
				normalModuleFactory.hooks.parser
					.for(JAVASCRIPT_MODULE_TYPE_DYNAMIC)
					.tap(PLUGIN_NAME, handler);
				normalModuleFactory.hooks.parser
					.for(JAVASCRIPT_MODULE_TYPE_ESM)
					.tap(PLUGIN_NAME, handler);
			}
		);
	}
}

module.exports = ExportsInfoApiPlugin;

license: mit


code:
/*
	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 EnvironmentNotSupportAsyncWarning = require("./EnvironmentNotSupportAsyncWarning");
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("./Generator").GenerateContext} GenerateContext */
/** @typedef {import("./Module").BuildInfo} BuildInfo */
/** @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("./Module").ReadOnlyRuntimeRequirements} ReadOnlyRuntimeRequirements */
/** @typedef {import("./Module").SourceTypes} SourceTypes */
/** @typedef {import("./ModuleGraph")} ModuleGraph */
/** @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("./javascript/JavascriptParser").ImportAttributes} ImportAttributes */
/** @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 {{ attributes?: ImportAttributes }} ImportDependencyMeta */
/** @typedef {{ layer?: string, supports?: string, media?: string }} CssImportDependencyMeta */

/** @typedef {ImportDependencyMeta | CssImportDependencyMeta} DependencyMeta */

/**
 * @typedef {object} SourceData
 * @property {boolean=} iife
 * @property {string=} init
 * @property {string} expression
 * @property {InitFragment<ChunkRenderContext>[]=} chunkInitFragments
 * @property {ReadOnlyRuntimeRequirements=} 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
 * @param {boolean} needPrefix need to use `node:` prefix for `module` import
 * @returns {SourceData} the generated source
 */
const getSourceForCommonJsExternalInNodeModule = (
	moduleAndSpecifiers,
	importMetaName,
	needPrefix
) => {
	const chunkInitFragments = [
		new InitFragment(
			`import { createRequire as __WEBPACK_EXTERNAL_createRequire } from "${
				needPrefix ? "node:" : ""
			}module";\n`,
			InitFragment.STAGE_HARMONY_IMPORTS,
			0,
			"external module node-commonjs"
		)
	];
	if (!Array.isArray(moduleAndSpecifiers)) {
		return {
			chunkInitFragments,
			expression: `__WEBPACK_EXTERNAL_createRequire(${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
 * @param {ImportDependencyMeta=} dependencyMeta the dependency meta
 * @returns {SourceData} the generated source
 */
const getSourceForImportExternal = (
	moduleAndSpecifiers,
	runtimeTemplate,
	dependencyMeta
) => {
	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'"
		);
	}
	const attributes =
		dependencyMeta && dependencyMeta.attributes
			? dependencyMeta.attributes._isLegacyAssert
				? `, { assert: ${JSON.stringify(
						dependencyMeta.attributes,
						importAssertionReplacer
					)} }`
				: `, { with: ${JSON.stringify(dependencyMeta.attributes)} }`
			: "";
	if (!Array.isArray(moduleAndSpecifiers)) {
		return {
			expression: `${importName}(${JSON.stringify(
				moduleAndSpecifiers
			)}${attributes});`
		};
	}
	if (moduleAndSpecifiers.length === 1) {
		return {
			expression: `${importName}(${JSON.stringify(
				moduleAndSpecifiers[0]
			)}${attributes});`
		};
	}
	const moduleName = moduleAndSpecifiers[0];
	return {
		expression: `${importName}(${JSON.stringify(
			moduleName
		)}${attributes}).then(${runtimeTemplate.returningFunction(
			`module${propertyAccess(moduleAndSpecifiers, 1)}`,
			"module"
		)});`
	};
};

/**
 * @param {string} key key
 * @param {any | undefined} value value
 * @returns {undefined | string} replaced value
 */
const importAssertionReplacer = (key, value) => {
	if (key === "_isLegacyAssert") {
		return undefined;
	}

	return value;
};

/**
 * @extends {InitFragment<ChunkRenderContext>}
 */
class ModuleExternalInitFragment extends InitFragment {
	/**
	 * @param {string} request import source
	 * @param {string=} ident recomputed ident
	 * @param {ImportDependencyMeta=} dependencyMeta the dependency meta
	 * @param {string | HashConstructor=} hashFunction the hash function to use
	 */
	constructor(request, ident, dependencyMeta, 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 ${JSON.stringify(request)}${
				dependencyMeta && dependencyMeta.attributes
					? dependencyMeta.attributes._isLegacyAssert
						? ` assert ${JSON.stringify(
								dependencyMeta.attributes,
								importAssertionReplacer
							)}`
						: ` with ${JSON.stringify(dependencyMeta.attributes)}`
					: ""
			};\n`,
			InitFragment.STAGE_HARMONY_IMPORTS,
			0,
			`external module import ${ident}`
		);
		this._ident = ident;
		this._request = request;
		this._dependencyMeta = request;
		this._identifier = identifier;
	}

	getNamespaceIdentifier() {
		return this._identifier;
	}
}

register(
	ModuleExternalInitFragment,
	"webpack/lib/ExternalModule",
	"ModuleExternalInitFragment",
	{
		serialize(obj, { write }) {
			write(obj._request);
			write(obj._ident);
			write(obj._dependencyMeta);
		},
		deserialize({ read }) {
			return new ModuleExternalInitFragment(read(), read(), read());
		}
	}
);

/**
 * @param {string} input input
 * @param {ExportsInfo} exportsInfo the exports info
 * @param {RuntimeSpec=} runtime the runtime
 * @param {RuntimeTemplate=} runtimeTemplate the runtime template
 * @returns {string | undefined} the module remapping
 */
const generateModuleRemapping = (
	input,
	exportsInfo,
	runtime,
	runtimeTemplate
) => {
	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)}]: ${
					/** @type {RuntimeTemplate} */ (runtimeTemplate).returningFunction(
						`${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 {RuntimeTemplate} runtimeTemplate the runtime template
 * @param {ImportDependencyMeta} dependencyMeta the dependency meta
 * @returns {SourceData} the generated source
 */
const getSourceForModuleExternal = (
	moduleAndSpecifiers,
	exportsInfo,
	runtime,
	runtimeTemplate,
	dependencyMeta
) => {
	if (!Array.isArray(moduleAndSpecifiers))
		moduleAndSpecifiers = [moduleAndSpecifiers];
	const initFragment = new ModuleExternalInitFragment(
		moduleAndSpecifiers[0],
		undefined,
		dependencyMeta,
		runtimeTemplate.outputOptions.hashFunction
	);
	const baseAccess = `${initFragment.getNamespaceIdentifier()}${propertyAccess(
		moduleAndSpecifiers,
		1
	)}`;
	const moduleRemapping = generateModuleRemapping(
		baseAccess,
		exportsInfo,
		runtime,
		runtimeTemplate
	);
	let expression = moduleRemapping || baseAccess;
	return {
		expression,
		init: moduleRemapping
			? `var x = ${runtimeTemplate.basicFunction(
					"y",
					`var x = {}; ${RuntimeGlobals.definePropertyGetters}(x, y); return x`
				)} \nvar y = ${runtimeTemplate.returningFunction(
					runtimeTemplate.returningFunction("x"),
					"x"
				)}`
			: undefined,
		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}`
	};
};

/** @typedef {Record<string, string | string[]>} RequestRecord */

class ExternalModule extends Module {
	/**
	 * @param {string | string[] | RequestRecord} request request
	 * @param {string} type type
	 * @param {string} userRequest user request
	 * @param {DependencyMeta=} dependencyMeta dependency meta
	 */
	constructor(request, type, userRequest, dependencyMeta) {
		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;
		/** @type {DependencyMeta=} */
		this.dependencyMeta = dependencyMeta;
	}

	/**
	 * @returns {SourceTypes} 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;
					EnvironmentNotSupportAsyncWarning.check(
						this,
						compilation.runtimeTemplate,
						"external module"
					);
					if (!Array.isArray(request) || request.length === 1) {
						this.buildMeta.exportsType = "namespace";
						canMangle = false;
					}
				}
				break;
			case "script":
				this.buildMeta.async = true;
				EnvironmentNotSupportAsyncWarning.check(
					this,
					compilation.runtimeTemplate,
					"external script"
				);
				break;
			case "promise":
				this.buildMeta.async = true;
				EnvironmentNotSupportAsyncWarning.check(
					this,
					compilation.runtimeTemplate,
					"external promise"
				);
				break;
			case "import":
				this.buildMeta.async = true;
				EnvironmentNotSupportAsyncWarning.check(
					this,
					compilation.runtimeTemplate,
					"external import"
				);
				if (!Array.isArray(request) || request.length === 1) {
					this.buildMeta.exportsType = "namespace";
					canMangle = false;
				}
				break;
		}
		this.addDependency(new StaticExportsDependency(true, canMangle));
		callback();
	}

	/**
	 * restore unsafe cache data
	 * @param {object} unsafeCacheData data from getUnsafeCacheData
	 * @param {NormalModuleFactory} normalModuleFactory the normal module factory handling the unsafe caching
	 */
	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 };
	}

	/**
	 * @private
	 * @param {string | string[]} request request
	 * @param {string} externalType the external type
	 * @param {RuntimeTemplate} runtimeTemplate the runtime template
	 * @param {ModuleGraph} moduleGraph the module graph
	 * @param {ChunkGraph} chunkGraph the chunk graph
	 * @param {RuntimeSpec} runtime the runtime
	 * @param {DependencyMeta | undefined} dependencyMeta the dependency meta
	 * @returns {SourceData} the source data
	 */
	_getSourceData(
		request,
		externalType,
		runtimeTemplate,
		moduleGraph,
		chunkGraph,
		runtime,
		dependencyMeta
	) {
		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 /** @type {BuildInfo} */ (this.buildInfo).module
					? getSourceForCommonJsExternalInNodeModule(
							request,
							/** @type {string} */
							(runtimeTemplate.outputOptions.importMetaName),
							runtimeTemplate.supportNodePrefixForCoreModules()
						)
					: 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,
					/** @type {ImportDependencyMeta} */ (dependencyMeta)
				);
			case "script":
				return getSourceForScriptExternal(request, runtimeTemplate);
			case "module": {
				if (!(/** @type {BuildInfo} */ (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,
						/** @type {ImportDependencyMeta} */ (dependencyMeta)
					);
				}
				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,
					/** @type {ImportDependencyMeta} */ (dependencyMeta)
				);
			}
			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 = ${JSON.stringify(request)};`)
				);
				const data = new Map();
				data.set("url", request);
				return { sources, runtimeRequirements: RUNTIME_REQUIREMENTS, data };
			}
			case "css-import": {
				const sources = new Map();
				const dependencyMeta = /** @type {CssImportDependencyMeta} */ (
					this.dependencyMeta
				);
				const layer =
					dependencyMeta.layer !== undefined
						? ` layer(${dependencyMeta.layer})`
						: "";
				const supports = dependencyMeta.supports
					? ` supports(${dependencyMeta.supports})`
					: "";
				const media = dependencyMeta.media ? ` ${dependencyMeta.media}` : "";
				sources.set(
					"css-import",
					new RawSource(
						`@import url(${JSON.stringify(
							request
						)})${layer}${supports}${media};`
					)
				);
				return {
					sources,
					runtimeRequirements: EMPTY_RUNTIME_REQUIREMENTS
				};
			}
			default: {
				const sourceData = this._getSourceData(
					request,
					externalType,
					runtimeTemplate,
					moduleGraph,
					chunkGraph,
					runtime,
					this.dependencyMeta
				);

				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);
		write(this.dependencyMeta);

		super.serialize(context);
	}

	/**
	 * @param {ObjectDeserializerContext} context context
	 */
	deserialize(context) {
		const { read } = context;

		this.request = read();
		this.externalType = read();
		this.userRequest = read();
		this.dependencyMeta = read();

		super.deserialize(context);
	}
}

makeSerializable(ExternalModule, "webpack/lib/ExternalModule");

module.exports = ExternalModule;


code:
/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Tobias Koppers @sokra
*/

"use strict";

const util = require("util");
const ExternalModule = require("./ExternalModule");
const ContextElementDependency = require("./dependencies/ContextElementDependency");
const CssImportDependency = require("./dependencies/CssImportDependency");
const HarmonyImportDependency = require("./dependencies/HarmonyImportDependency");
const ImportDependency = require("./dependencies/ImportDependency");
const { resolveByProperty, cachedSetProperty } = require("./util/cleverMerge");

/** @typedef {import("../declarations/WebpackOptions").Externals} Externals */
/** @typedef {import("./Compilation").DepConstructor} DepConstructor */
/** @typedef {import("./ExternalModule").DependencyMeta} DependencyMeta */
/** @typedef {import("./Module")} Module */
/** @typedef {import("./NormalModuleFactory")} NormalModuleFactory */

const UNSPECIFIED_EXTERNAL_TYPE_REGEXP = /^[a-z0-9-]+ /;
const EMPTY_RESOLVE_OPTIONS = {};

// TODO webpack 6 remove this
const callDeprecatedExternals = util.deprecate(
	(externalsFunction, context, request, cb) => {
		externalsFunction.call(null, context, request, cb);
	},
	"The externals-function should be defined like ({context, request}, cb) => { ... }",
	"DEP_WEBPACK_EXTERNALS_FUNCTION_PARAMETERS"
);

const cache = new WeakMap();

const resolveLayer = (obj, layer) => {
	let map = cache.get(obj);
	if (map === undefined) {
		map = new Map();
		cache.set(obj, map);
	} else {
		const cacheEntry = map.get(layer);
		if (cacheEntry !== undefined) return cacheEntry;
	}
	const result = resolveByProperty(obj, "byLayer", layer);
	map.set(layer, result);
	return result;
};

class ExternalModuleFactoryPlugin {
	/**
	 * @param {string | undefined} type default external type
	 * @param {Externals} externals externals config
	 */
	constructor(type, externals) {
		this.type = type;
		this.externals = externals;
	}

	/**
	 * @param {NormalModuleFactory} normalModuleFactory the normal module factory
	 * @returns {void}
	 */
	apply(normalModuleFactory) {
		const globalType = this.type;
		normalModuleFactory.hooks.factorize.tapAsync(
			"ExternalModuleFactoryPlugin",
			(data, callback) => {
				const context = data.context;
				const contextInfo = data.contextInfo;
				const dependency = data.dependencies[0];
				const dependencyType = data.dependencyType;

				/**
				 * @param {string|string[]|boolean|Record<string, string|string[]>} value the external config
				 * @param {string|undefined} type type of external
				 * @param {function((Error | null)=, ExternalModule=): void} callback callback
				 * @returns {void}
				 */
				const handleExternal = (value, type, callback) => {
					if (value === false) {
						// Not externals, fallback to original factory
						return callback();
					}
					/** @type {string | string[] | Record<string, string|string[]>} */
					let externalConfig;
					if (value === true) {
						externalConfig = dependency.request;
					} else {
						externalConfig = value;
					}
					// When no explicit type is specified, extract it from the externalConfig
					if (type === undefined) {
						if (
							typeof externalConfig === "string" &&
							UNSPECIFIED_EXTERNAL_TYPE_REGEXP.test(externalConfig)
						) {
							const idx = externalConfig.indexOf(" ");
							type = externalConfig.slice(0, idx);
							externalConfig = externalConfig.slice(idx + 1);
						} else if (
							Array.isArray(externalConfig) &&
							externalConfig.length > 0 &&
							UNSPECIFIED_EXTERNAL_TYPE_REGEXP.test(externalConfig[0])
						) {
							const firstItem = externalConfig[0];
							const idx = firstItem.indexOf(" ");
							type = firstItem.slice(0, idx);
							externalConfig = [
								firstItem.slice(idx + 1),
								...externalConfig.slice(1)
							];
						}
					}

					// TODO make it pluggable/add hooks to `ExternalModule` to allow output modules own externals?
					/** @type {DependencyMeta | undefined} */
					let dependencyMeta;

					if (
						dependency instanceof HarmonyImportDependency ||
						dependency instanceof ImportDependency ||
						dependency instanceof ContextElementDependency
					) {
						dependencyMeta = {
							attributes: dependency.assertions
						};
					} else if (dependency instanceof CssImportDependency) {
						dependencyMeta = {
							layer: dependency.layer,
							supports: dependency.supports,
							media: dependency.media
						};
					}

					callback(
						null,
						new ExternalModule(
							externalConfig,
							type || globalType,
							dependency.request,
							dependencyMeta
						)
					);
				};

				/**
				 * @param {Externals} externals externals config
				 * @param {function((Error | null)=, ExternalModule=): void} callback callback
				 * @returns {void}
				 */
				const handleExternals = (externals, callback) => {
					if (typeof externals === "string") {
						if (externals === dependency.request) {
							return handleExternal(dependency.request, undefined, callback);
						}
					} else if (Array.isArray(externals)) {
						let i = 0;
						const next = () => {
							/** @type {boolean | undefined} */
							let asyncFlag;
							/**
							 * @param {(Error | null)=} err err
							 * @param {ExternalModule=} module module
							 * @returns {void}
							 */
							const handleExternalsAndCallback = (err, module) => {
								if (err) return callback(err);
								if (!module) {
									if (asyncFlag) {
										asyncFlag = false;
										return;
									}
									return next();
								}
								callback(null, module);
							};

							do {
								asyncFlag = true;
								if (i >= externals.length) return callback();
								handleExternals(externals[i++], handleExternalsAndCallback);
							} while (!asyncFlag);
							asyncFlag = false;
						};

						next();
						return;
					} else if (externals instanceof RegExp) {
						if (externals.test(dependency.request)) {
							return handleExternal(dependency.request, undefined, callback);
						}
					} else if (typeof externals === "function") {
						const cb = (err, value, type) => {
							if (err) return callback(err);
							if (value !== undefined) {
								handleExternal(value, type, callback);
							} else {
								callback();
							}
						};
						if (externals.length === 3) {
							// TODO webpack 6 remove this
							callDeprecatedExternals(
								externals,
								context,
								dependency.request,
								cb
							);
						} else {
							const promise = externals(
								{
									context,
									request: dependency.request,
									dependencyType,
									contextInfo,
									getResolve: options => (context, request, callback) => {
										const resolveContext = {
											fileDependencies: data.fileDependencies,
											missingDependencies: data.missingDependencies,
											contextDependencies: data.contextDependencies
										};
										let resolver = normalModuleFactory.getResolver(
											"normal",
											dependencyType
												? cachedSetProperty(
														data.resolveOptions || EMPTY_RESOLVE_OPTIONS,
														"dependencyType",
														dependencyType
													)
												: data.resolveOptions
										);
										if (options) resolver = resolver.withOptions(options);
										if (callback) {
											resolver.resolve(
												{},
												context,
												request,
												resolveContext,
												callback
											);
										} else {
											return new Promise((resolve, reject) => {
												resolver.resolve(
													{},
													context,
													request,
													resolveContext,
													(err, result) => {
														if (err) reject(err);
														else resolve(result);
													}
												);
											});
										}
									}
								},
								cb
							);
							if (promise && promise.then) promise.then(r => cb(null, r), cb);
						}
						return;
					} else if (typeof externals === "object") {
						const resolvedExternals = resolveLayer(
							externals,
							contextInfo.issuerLayer
						);
						if (
							Object.prototype.hasOwnProperty.call(
								resolvedExternals,
								dependency.request
							)
						) {
							return handleExternal(
								resolvedExternals[dependency.request],
								undefined,
								callback
							);
						}
					}
					callback();
				};

				handleExternals(this.externals, callback);
			}
		);
	}
}
module.exports = ExternalModuleFactoryPlugin;


code:
/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Tobias Koppers @sokra
*/

"use strict";

const ExternalModuleFactoryPlugin = require("./ExternalModuleFactoryPlugin");

/** @typedef {import("../declarations/WebpackOptions").Externals} Externals */
/** @typedef {import("./Compiler")} Compiler */

class ExternalsPlugin {
	/**
	 * @param {string | undefined} type default external type
	 * @param {Externals} externals externals config
	 */
	constructor(type, externals) {
		this.type = type;
		this.externals = externals;
	}

	/**
	 * Apply the plugin
	 * @param {Compiler} compiler the compiler instance
	 * @returns {void}
	 */
	apply(compiler) {
		compiler.hooks.compile.tap("ExternalsPlugin", ({ normalModuleFactory }) => {
			new ExternalModuleFactoryPlugin(this.type, this.externals).apply(
				normalModuleFactory
			);
		});
	}
}

module.exports = ExternalsPlugin;