ExportsInfo.js
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Created: Sun, Jul 6, 15:03

ExportsInfo.js
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	/*
	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("./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;
	}

	serialize({ write }) {
	write(this.exports);
	write(this.otherProvided);
	write(this.otherCanMangleProvide);
	write(this.otherTerminalBinding);
	}

	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 entriesInOrder = Array.from(exports.values());
	if (
	entriesInOrder.length !== 2 \|\|
	entriesInOrder[0].name > entriesInOrder[1].name
	) {
	entriesInOrder.sort((a, b) => {
	return a.name < b.name ? -1 : 1;
	});
	exports.clear();
	for (const entry of entriesInOrder) {
	exports.set(entry.name, entry);
	}
	}
	}
	}

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

	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();
	if (this._otherExportsInfo.canMangleUse === undefined) {
	this._otherExportsInfo.canMangleUse = true;
	}
	}
	}

	/**
	* @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
	* @returns {boolean} true, if this call changed something
	*/
	setUnknownExportsProvided(
	canMangle,
	excludeExports,
	targetKey,
	targetModule
	) {
	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 (excludeExports && excludeExports.has(exportInfo.name)) continue;
	if (exportInfo.provided !== true && exportInfo.provided !== null) {
	exportInfo.provided = null;
	changed = true;
	}
	if (!canMangle && exportInfo.canMangleProvide !== false) {
	exportInfo.canMangleProvide = false;
	changed = true;
	}
	if (targetKey) {
	exportInfo.setTarget(targetKey, targetModule, [exportInfo.name]);
	}
	}
	if (this._redirectTo !== undefined) {
	if (
	this._redirectTo.setUnknownExportsProvided(
	canMangle,
	excludeExports,
	targetKey,
	targetModule
	)
	) {
	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, targetModule, undefined);
	}
	}
	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.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) {
	if (!this._redirectTo !== undefined) {
	switch (this._otherExportsInfo.getUsed(runtime)) {
	case UsageState.NoInfo:
	return null;
	case UsageState.Unknown:
	return true;
	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() {
	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;
	}
	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[]} 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) {
	for (const exportInfo of this.orderedExports) {
	exportInfo.updateHash(hash, runtime);
	}
	this._sideEffectsOnlyInfo.updateHash(hash, runtime);
	this._otherExportsInfo.updateHash(hash, runtime);
	if (this._redirectTo !== undefined) {
	this._redirectTo.updateHash(hash, runtime);
	}
	}

	getRestoreProvidedData() {
	const otherProvided = this._otherExportsInfo.provided;
	const otherCanMangleProvide = this._otherExportsInfo.canMangleProvide;
	const otherTerminalBinding = this._otherExportsInfo.terminalBinding;
	const exports = [];
	for (const exportInfo of this._exports.values()) {
	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
	);
	}

	restoreProvided({
	otherProvided,
	otherCanMangleProvide,
	otherTerminalBinding,
	exports
	}) {
	for (const exportInfo of this._exports.values()) {
	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);
	}
	}
	}
	}

	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, export: string[] } \| null>=} */
	this._target = undefined;
	if (initFrom && initFrom._target) {
	this._target = new Map();
	for (const [key, value] of initFrom._target) {
	this._target.set(
	key,
	value ? { connection: value.connection, export: [name] } : null
	);
	}
	}
	}

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

	/**
	* @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> \| undefined} 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._target.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, 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._target.values();
	const target = resolveTarget(values.next().value, newAlreadyVisited);
	if (target === CIRCULAR) return CIRCULAR;
	if (target === null) return undefined;
	if (this._target.size === 1) {
	return target;
	}
	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(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
	* @returns {{ module: Module, export: string[] \| undefined } \| undefined} the target
	*/
	moveTarget(moduleGraph, resolveTargetFilter) {
	const target = this._getTarget(moduleGraph, resolveTargetFilter, undefined);
	if (target === CIRCULAR) return undefined;
	if (!target) return undefined;
	this._target.clear();
	this._target.set(undefined, {
	connection: target.connection,
	export: target.export
	});
	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;
	}

	updateHash(hash, runtime) {
	hash.update(`${this._usedName \|\| this.name}`);
	hash.update(`${this.getUsed(runtime)}`);
	hash.update(`${this.provided}`);
	hash.update(`${this.canMangle}`);
	hash.update(`${this.terminalBinding}`);
	}

	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;

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