added make browserlist(autoprefixer) work fixed

1 files changed, 1467 insertions, 0 deletions

diff --git a/node_modules/webpack/lib/cache/PackFileCacheStrategy.js b/node_modules/webpack/lib/cache/PackFileCacheStrategy.js
new file mode 100644
index 00000000..3462e914
--- /dev/null
+++ b/node_modules/webpack/lib/cache/PackFileCacheStrategy.js
@@ -0,0 +1,1467 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const FileSystemInfo = require("../FileSystemInfo");
+const ProgressPlugin = require("../ProgressPlugin");
+const { formatSize } = require("../SizeFormatHelpers");
+const SerializerMiddleware = require("../serialization/SerializerMiddleware");
+const LazySet = require("../util/LazySet");
+const makeSerializable = require("../util/makeSerializable");
+const memoize = require("../util/memoize");
+const {
+	createFileSerializer,
+	NOT_SERIALIZABLE
+} = require("../util/serialization");
+
+/** @typedef {import("../../declarations/WebpackOptions").SnapshotOptions} SnapshotOptions */
+/** @typedef {import("../Cache").Etag} Etag */
+/** @typedef {import("../Compiler")} Compiler */
+/** @typedef {import("../FileSystemInfo").ResolveBuildDependenciesResult} ResolveBuildDependenciesResult */
+/** @typedef {import("../FileSystemInfo").Snapshot} Snapshot */
+/** @typedef {import("../logging/Logger").Logger} Logger */
+/** @typedef {import("../serialization/ObjectMiddleware").ObjectDeserializerContext} ObjectDeserializerContext */
+/** @typedef {import("../serialization/ObjectMiddleware").ObjectSerializerContext} ObjectSerializerContext */
+/** @typedef {import("../util/fs").IntermediateFileSystem} IntermediateFileSystem */
+
+/** @typedef {Map<string, string | false>} ResolveResults */
+
+class PackContainer {
+	/**
+	 * @param {Object} data stored data
+	 * @param {string} version version identifier
+	 * @param {Snapshot} buildSnapshot snapshot of all build dependencies
+	 * @param {Set<string>} buildDependencies list of all unresolved build dependencies captured
+	 * @param {ResolveResults} resolveResults result of the resolved build dependencies
+	 * @param {Snapshot} resolveBuildDependenciesSnapshot snapshot of the dependencies of the build dependencies resolving
+	 */
+	constructor(
+		data,
+		version,
+		buildSnapshot,
+		buildDependencies,
+		resolveResults,
+		resolveBuildDependenciesSnapshot
+	) {
+		this.data = data;
+		this.version = version;
+		this.buildSnapshot = buildSnapshot;
+		this.buildDependencies = buildDependencies;
+		this.resolveResults = resolveResults;
+		this.resolveBuildDependenciesSnapshot = resolveBuildDependenciesSnapshot;
+	}
+
+	serialize({ write, writeLazy }) {
+		write(this.version);
+		write(this.buildSnapshot);
+		write(this.buildDependencies);
+		write(this.resolveResults);
+		write(this.resolveBuildDependenciesSnapshot);
+		writeLazy(this.data);
+	}
+
+	/**
+	 * @param {ObjectDeserializerContext} context context
+	 */
+	deserialize({ read }) {
+		this.version = read();
+		this.buildSnapshot = read();
+		this.buildDependencies = read();
+		this.resolveResults = read();
+		this.resolveBuildDependenciesSnapshot = read();
+		this.data = read();
+	}
+}
+
+makeSerializable(
+	PackContainer,
+	"webpack/lib/cache/PackFileCacheStrategy",
+	"PackContainer"
+);
+
+const MIN_CONTENT_SIZE = 1024 * 1024; // 1 MB
+const CONTENT_COUNT_TO_MERGE = 10;
+const MIN_ITEMS_IN_FRESH_PACK = 100;
+const MAX_ITEMS_IN_FRESH_PACK = 50000;
+const MAX_TIME_IN_FRESH_PACK = 1 * 60 * 1000; // 1 min
+
+class PackItemInfo {
+	/**
+	 * @param {string} identifier identifier of item
+	 * @param {string | null} etag etag of item
+	 * @param {any} value fresh value of item
+	 */
+	constructor(identifier, etag, value) {
+		this.identifier = identifier;
+		this.etag = etag;
+		this.location = -1;
+		this.lastAccess = Date.now();
+		this.freshValue = value;
+	}
+}
+
+class Pack {
+	constructor(logger, maxAge) {
+		/** @type {Map<string, PackItemInfo>} */
+		this.itemInfo = new Map();
+		/** @type {(string | undefined)[]} */
+		this.requests = [];
+		this.requestsTimeout = undefined;
+		/** @type {Map<string, PackItemInfo>} */
+		this.freshContent = new Map();
+		/** @type {(undefined | PackContent)[]} */
+		this.content = [];
+		this.invalid = false;
+		this.logger = logger;
+		this.maxAge = maxAge;
+	}
+
+	/**
+	 * @param {string} identifier identifier
+	 */
+	_addRequest(identifier) {
+		this.requests.push(identifier);
+		if (this.requestsTimeout === undefined) {
+			this.requestsTimeout = setTimeout(() => {
+				this.requests.push(undefined);
+				this.requestsTimeout = undefined;
+			}, MAX_TIME_IN_FRESH_PACK);
+			if (this.requestsTimeout.unref) this.requestsTimeout.unref();
+		}
+	}
+
+	stopCapturingRequests() {
+		if (this.requestsTimeout !== undefined) {
+			clearTimeout(this.requestsTimeout);
+			this.requestsTimeout = undefined;
+		}
+	}
+
+	/**
+	 * @param {string} identifier unique name for the resource
+	 * @param {string | null} etag etag of the resource
+	 * @returns {any} cached content
+	 */
+	get(identifier, etag) {
+		const info = this.itemInfo.get(identifier);
+		this._addRequest(identifier);
+		if (info === undefined) {
+			return undefined;
+		}
+		if (info.etag !== etag) return null;
+		info.lastAccess = Date.now();
+		const loc = info.location;
+		if (loc === -1) {
+			return info.freshValue;
+		} else {
+			if (!this.content[loc]) {
+				return undefined;
+			}
+			return /** @type {PackContent} */ (this.content[loc]).get(identifier);
+		}
+	}
+
+	/**
+	 * @param {string} identifier unique name for the resource
+	 * @param {string | null} etag etag of the resource
+	 * @param {any} data cached content
+	 * @returns {void}
+	 */
+	set(identifier, etag, data) {
+		if (!this.invalid) {
+			this.invalid = true;
+			this.logger.log(`Pack got invalid because of write to: ${identifier}`);
+		}
+		const info = this.itemInfo.get(identifier);
+		if (info === undefined) {
+			const newInfo = new PackItemInfo(identifier, etag, data);
+			this.itemInfo.set(identifier, newInfo);
+			this._addRequest(identifier);
+			this.freshContent.set(identifier, newInfo);
+		} else {
+			const loc = info.location;
+			if (loc >= 0) {
+				this._addRequest(identifier);
+				this.freshContent.set(identifier, info);
+				const content = /** @type {PackContent} */ (this.content[loc]);
+				content.delete(identifier);
+				if (content.items.size === 0) {
+					this.content[loc] = undefined;
+					this.logger.debug("Pack %d got empty and is removed", loc);
+				}
+			}
+			info.freshValue = data;
+			info.lastAccess = Date.now();
+			info.etag = etag;
+			info.location = -1;
+		}
+	}
+
+	getContentStats() {
+		let count = 0;
+		let size = 0;
+		for (const content of this.content) {
+			if (content !== undefined) {
+				count++;
+				const s = content.getSize();
+				if (s > 0) {
+					size += s;
+				}
+			}
+		}
+		return { count, size };
+	}
+
+	/**
+	 * @returns {number} new location of data entries
+	 */
+	_findLocation() {
+		let i;
+		for (i = 0; i < this.content.length && this.content[i] !== undefined; i++);
+		return i;
+	}
+
+	_gcAndUpdateLocation(items, usedItems, newLoc) {
+		let count = 0;
+		let lastGC;
+		const now = Date.now();
+		for (const identifier of items) {
+			const info = this.itemInfo.get(identifier);
+			if (now - info.lastAccess > this.maxAge) {
+				this.itemInfo.delete(identifier);
+				items.delete(identifier);
+				usedItems.delete(identifier);
+				count++;
+				lastGC = identifier;
+			} else {
+				info.location = newLoc;
+			}
+		}
+		if (count > 0) {
+			this.logger.log(
+				"Garbage Collected %d old items at pack %d (%d items remaining) e. g. %s",
+				count,
+				newLoc,
+				items.size,
+				lastGC
+			);
+		}
+	}
+
+	_persistFreshContent() {
+		const itemsCount = this.freshContent.size;
+		if (itemsCount > 0) {
+			const packCount = Math.ceil(itemsCount / MAX_ITEMS_IN_FRESH_PACK);
+			const itemsPerPack = Math.ceil(itemsCount / packCount);
+			const packs = [];
+			let i = 0;
+			let ignoreNextTimeTick = false;
+			const createNextPack = () => {
+				const loc = this._findLocation();
+				this.content[loc] = null; // reserve
+				const pack = {
+					/** @type {Set<string>} */
+					items: new Set(),
+					/** @type {Map<string, any>} */
+					map: new Map(),
+					loc
+				};
+				packs.push(pack);
+				return pack;
+			};
+			let pack = createNextPack();
+			if (this.requestsTimeout !== undefined)
+				clearTimeout(this.requestsTimeout);
+			for (const identifier of this.requests) {
+				if (identifier === undefined) {
+					if (ignoreNextTimeTick) {
+						ignoreNextTimeTick = false;
+					} else if (pack.items.size >= MIN_ITEMS_IN_FRESH_PACK) {
+						i = 0;
+						pack = createNextPack();
+					}
+					continue;
+				}
+				const info = this.freshContent.get(identifier);
+				if (info === undefined) continue;
+				pack.items.add(identifier);
+				pack.map.set(identifier, info.freshValue);
+				info.location = pack.loc;
+				info.freshValue = undefined;
+				this.freshContent.delete(identifier);
+				if (++i > itemsPerPack) {
+					i = 0;
+					pack = createNextPack();
+					ignoreNextTimeTick = true;
+				}
+			}
+			this.requests.length = 0;
+			for (const pack of packs) {
+				this.content[pack.loc] = new PackContent(
+					pack.items,
+					new Set(pack.items),
+					new PackContentItems(pack.map)
+				);
+			}
+			this.logger.log(
+				`${itemsCount} fresh items in cache put into pack ${
+					packs.length > 1
+						? packs
+								.map(pack => `${pack.loc} (${pack.items.size} items)`)
+								.join(", ")
+						: packs[0].loc
+				}`
+			);
+		}
+	}
+
+	/**
+	 * Merges small content files to a single content file
+	 */
+	_optimizeSmallContent() {
+		// 1. Find all small content files
+		// Treat unused content files separately to avoid
+		// a merge-split cycle
+		/** @type {number[]} */
+		const smallUsedContents = [];
+		/** @type {number} */
+		let smallUsedContentSize = 0;
+		/** @type {number[]} */
+		const smallUnusedContents = [];
+		/** @type {number} */
+		let smallUnusedContentSize = 0;
+		for (let i = 0; i < this.content.length; i++) {
+			const content = this.content[i];
+			if (content === undefined) continue;
+			if (content.outdated) continue;
+			const size = content.getSize();
+			if (size < 0 || size > MIN_CONTENT_SIZE) continue;
+			if (content.used.size > 0) {
+				smallUsedContents.push(i);
+				smallUsedContentSize += size;
+			} else {
+				smallUnusedContents.push(i);
+				smallUnusedContentSize += size;
+			}
+		}
+
+		// 2. Check if minimum number is reached
+		let mergedIndices;
+		if (
+			smallUsedContents.length >= CONTENT_COUNT_TO_MERGE ||
+			smallUsedContentSize > MIN_CONTENT_SIZE
+		) {
+			mergedIndices = smallUsedContents;
+		} else if (
+			smallUnusedContents.length >= CONTENT_COUNT_TO_MERGE ||
+			smallUnusedContentSize > MIN_CONTENT_SIZE
+		) {
+			mergedIndices = smallUnusedContents;
+		} else return;
+
+		/** @type {PackContent[] } */
+		const mergedContent = [];
+
+		// 3. Remove old content entries
+		for (const i of mergedIndices) {
+			mergedContent.push(/** @type {PackContent} */ (this.content[i]));
+			this.content[i] = undefined;
+		}
+
+		// 4. Determine merged items
+		/** @type {Set<string>} */
+		const mergedItems = new Set();
+		/** @type {Set<string>} */
+		const mergedUsedItems = new Set();
+		/** @type {(function(Map<string, any>): Promise<void>)[]} */
+		const addToMergedMap = [];
+		for (const content of mergedContent) {
+			for (const identifier of content.items) {
+				mergedItems.add(identifier);
+			}
+			for (const identifier of content.used) {
+				mergedUsedItems.add(identifier);
+			}
+			addToMergedMap.push(async map => {
+				// unpack existing content
+				// after that values are accessible in .content
+				await content.unpack(
+					"it should be merged with other small pack contents"
+				);
+				for (const [identifier, value] of content.content) {
+					map.set(identifier, value);
+				}
+			});
+		}
+
+		// 5. GC and update location of merged items
+		const newLoc = this._findLocation();
+		this._gcAndUpdateLocation(mergedItems, mergedUsedItems, newLoc);
+
+		// 6. If not empty, store content somewhere
+		if (mergedItems.size > 0) {
+			this.content[newLoc] = new PackContent(
+				mergedItems,
+				mergedUsedItems,
+				memoize(async () => {
+					/** @type {Map<string, any>} */
+					const map = new Map();
+					await Promise.all(addToMergedMap.map(fn => fn(map)));
+					return new PackContentItems(map);
+				})
+			);
+			this.logger.log(
+				"Merged %d small files with %d cache items into pack %d",
+				mergedContent.length,
+				mergedItems.size,
+				newLoc
+			);
+		}
+	}
+
+	/**
+	 * Split large content files with used and unused items
+	 * into two parts to separate used from unused items
+	 */
+	_optimizeUnusedContent() {
+		// 1. Find a large content file with used and unused items
+		for (let i = 0; i < this.content.length; i++) {
+			const content = this.content[i];
+			if (content === undefined) continue;
+			const size = content.getSize();
+			if (size < MIN_CONTENT_SIZE) continue;
+			const used = content.used.size;
+			const total = content.items.size;
+			if (used > 0 && used < total) {
+				// 2. Remove this content
+				this.content[i] = undefined;
+
+				// 3. Determine items for the used content file
+				const usedItems = new Set(content.used);
+				const newLoc = this._findLocation();
+				this._gcAndUpdateLocation(usedItems, usedItems, newLoc);
+
+				// 4. Create content file for used items
+				if (usedItems.size > 0) {
+					this.content[newLoc] = new PackContent(
+						usedItems,
+						new Set(usedItems),
+						async () => {
+							await content.unpack(
+								"it should be splitted into used and unused items"
+							);
+							const map = new Map();
+							for (const identifier of usedItems) {
+								map.set(identifier, content.content.get(identifier));
+							}
+							return new PackContentItems(map);
+						}
+					);
+				}
+
+				// 5. Determine items for the unused content file
+				const unusedItems = new Set(content.items);
+				const usedOfUnusedItems = new Set();
+				for (const identifier of usedItems) {
+					unusedItems.delete(identifier);
+				}
+				const newUnusedLoc = this._findLocation();
+				this._gcAndUpdateLocation(unusedItems, usedOfUnusedItems, newUnusedLoc);
+
+				// 6. Create content file for unused items
+				if (unusedItems.size > 0) {
+					this.content[newUnusedLoc] = new PackContent(
+						unusedItems,
+						usedOfUnusedItems,
+						async () => {
+							await content.unpack(
+								"it should be splitted into used and unused items"
+							);
+							const map = new Map();
+							for (const identifier of unusedItems) {
+								map.set(identifier, content.content.get(identifier));
+							}
+							return new PackContentItems(map);
+						}
+					);
+				}
+
+				this.logger.log(
+					"Split pack %d into pack %d with %d used items and pack %d with %d unused items",
+					i,
+					newLoc,
+					usedItems.size,
+					newUnusedLoc,
+					unusedItems.size
+				);
+
+				// optimizing only one of them is good enough and
+				// reduces the amount of serialization needed
+				return;
+			}
+		}
+	}
+
+	/**
+	 * Find the content with the oldest item and run GC on that.
+	 * Only runs for one content to avoid large invalidation.
+	 */
+	_gcOldestContent() {
+		/** @type {PackItemInfo | undefined} */
+		let oldest = undefined;
+		for (const info of this.itemInfo.values()) {
+			if (oldest === undefined || info.lastAccess < oldest.lastAccess) {
+				oldest = info;
+			}
+		}
+		if (
+			Date.now() - /** @type {PackItemInfo} */ (oldest).lastAccess >
+			this.maxAge
+		) {
+			const loc = /** @type {PackItemInfo} */ (oldest).location;
+			if (loc < 0) return;
+			const content = /** @type {PackContent} */ (this.content[loc]);
+			const items = new Set(content.items);
+			const usedItems = new Set(content.used);
+			this._gcAndUpdateLocation(items, usedItems, loc);
+
+			this.content[loc] =
+				items.size > 0
+					? new PackContent(items, usedItems, async () => {
+							await content.unpack(
+								"it contains old items that should be garbage collected"
+							);
+							const map = new Map();
+							for (const identifier of items) {
+								map.set(identifier, content.content.get(identifier));
+							}
+							return new PackContentItems(map);
+					  })
+					: undefined;
+		}
+	}
+
+	serialize({ write, writeSeparate }) {
+		this._persistFreshContent();
+		this._optimizeSmallContent();
+		this._optimizeUnusedContent();
+		this._gcOldestContent();
+		for (const identifier of this.itemInfo.keys()) {
+			write(identifier);
+		}
+		write(null); // null as marker of the end of keys
+		for (const info of this.itemInfo.values()) {
+			write(info.etag);
+		}
+		for (const info of this.itemInfo.values()) {
+			write(info.lastAccess);
+		}
+		for (let i = 0; i < this.content.length; i++) {
+			const content = this.content[i];
+			if (content !== undefined) {
+				write(content.items);
+				content.writeLazy(lazy => writeSeparate(lazy, { name: `${i}` }));
+			} else {
+				write(undefined); // undefined marks an empty content slot
+			}
+		}
+		write(null); // null as marker of the end of items
+	}
+
+	deserialize({ read, logger }) {
+		this.logger = logger;
+		{
+			const items = [];
+			let item = read();
+			while (item !== null) {
+				items.push(item);
+				item = read();
+			}
+			this.itemInfo.clear();
+			const infoItems = items.map(identifier => {
+				const info = new PackItemInfo(identifier, undefined, undefined);
+				this.itemInfo.set(identifier, info);
+				return info;
+			});
+			for (const info of infoItems) {
+				info.etag = read();
+			}
+			for (const info of infoItems) {
+				info.lastAccess = read();
+			}
+		}
+		this.content.length = 0;
+		let items = read();
+		while (items !== null) {
+			if (items === undefined) {
+				this.content.push(items);
+			} else {
+				const idx = this.content.length;
+				const lazy = read();
+				this.content.push(
+					new PackContent(
+						items,
+						new Set(),
+						lazy,
+						logger,
+						`${this.content.length}`
+					)
+				);
+				for (const identifier of items) {
+					this.itemInfo.get(identifier).location = idx;
+				}
+			}
+			items = read();
+		}
+	}
+}
+
+makeSerializable(Pack, "webpack/lib/cache/PackFileCacheStrategy", "Pack");
+
+class PackContentItems {
+	/**
+	 * @param {Map<string, any>} map items
+	 */
+	constructor(map) {
+		this.map = map;
+	}
+
+	serialize({ write, snapshot, rollback, logger, profile }) {
+		if (profile) {
+			write(false);
+			for (const [key, value] of this.map) {
+				const s = snapshot();
+				try {
+					write(key);
+					const start = process.hrtime();
+					write(value);
+					const durationHr = process.hrtime(start);
+					const duration = durationHr[0] * 1000 + durationHr[1] / 1e6;
+					if (duration > 1) {
+						if (duration > 500)
+							logger.error(`Serialization of '${key}': ${duration} ms`);
+						else if (duration > 50)
+							logger.warn(`Serialization of '${key}': ${duration} ms`);
+						else if (duration > 10)
+							logger.info(`Serialization of '${key}': ${duration} ms`);
+						else if (duration > 5)
+							logger.log(`Serialization of '${key}': ${duration} ms`);
+						else logger.debug(`Serialization of '${key}': ${duration} ms`);
+					}
+				} catch (e) {
+					rollback(s);
+					if (e === NOT_SERIALIZABLE) continue;
+					const msg = "Skipped not serializable cache item";
+					if (e.message.includes("ModuleBuildError")) {
+						logger.log(`${msg} (in build error): ${e.message}`);
+						logger.debug(`${msg} '${key}' (in build error): ${e.stack}`);
+					} else {
+						logger.warn(`${msg}: ${e.message}`);
+						logger.debug(`${msg} '${key}': ${e.stack}`);
+					}
+				}
+			}
+			write(null);
+			return;
+		}
+		// Try to serialize all at once
+		const s = snapshot();
+		try {
+			write(true);
+			write(this.map);
+		} catch (e) {
+			rollback(s);
+
+			// Try to serialize each item on it's own
+			write(false);
+			for (const [key, value] of this.map) {
+				const s = snapshot();
+				try {
+					write(key);
+					write(value);
+				} catch (e) {
+					rollback(s);
+					if (e === NOT_SERIALIZABLE) continue;
+					logger.warn(
+						`Skipped not serializable cache item '${key}': ${e.message}`
+					);
+					logger.debug(e.stack);
+				}
+			}
+			write(null);
+		}
+	}
+
+	deserialize({ read, logger, profile }) {
+		if (read()) {
+			this.map = read();
+		} else if (profile) {
+			const map = new Map();
+			let key = read();
+			while (key !== null) {
+				const start = process.hrtime();
+				const value = read();
+				const durationHr = process.hrtime(start);
+				const duration = durationHr[0] * 1000 + durationHr[1] / 1e6;
+				if (duration > 1) {
+					if (duration > 100)
+						logger.error(`Deserialization of '${key}': ${duration} ms`);
+					else if (duration > 20)
+						logger.warn(`Deserialization of '${key}': ${duration} ms`);
+					else if (duration > 5)
+						logger.info(`Deserialization of '${key}': ${duration} ms`);
+					else if (duration > 2)
+						logger.log(`Deserialization of '${key}': ${duration} ms`);
+					else logger.debug(`Deserialization of '${key}': ${duration} ms`);
+				}
+				map.set(key, value);
+				key = read();
+			}
+			this.map = map;
+		} else {
+			const map = new Map();
+			let key = read();
+			while (key !== null) {
+				map.set(key, read());
+				key = read();
+			}
+			this.map = map;
+		}
+	}
+}
+
+makeSerializable(
+	PackContentItems,
+	"webpack/lib/cache/PackFileCacheStrategy",
+	"PackContentItems"
+);
+
+class PackContent {
+	/*
+		This class can be in these states:
+		   |   this.lazy    | this.content | this.outdated | state
+		A1 |   undefined    |     Map      |     false     | fresh content
+		A2 |   undefined    |     Map      |     true      | (will not happen)
+		B1 | lazy () => {}  |  undefined   |     false     | not deserialized
+		B2 | lazy () => {}  |  undefined   |     true      | not deserialized, but some items has been removed
+		C1 | lazy* () => {} |     Map      |     false     | deserialized
+		C2 | lazy* () => {} |     Map      |     true      | deserialized, and some items has been removed
+
+		this.used is a subset of this.items.
+		this.items is a subset of this.content.keys() resp. this.lazy().map.keys()
+		When this.outdated === false, this.items === this.content.keys() resp. this.lazy().map.keys()
+		When this.outdated === true, this.items should be used to recreated this.lazy/this.content.
+		When this.lazy and this.content is set, they contain the same data.
+		this.get must only be called with a valid item from this.items.
+		In state C this.lazy is unMemoized
+	*/
+
+	/**
+	 * @param {Set<string>} items keys
+	 * @param {Set<string>} usedItems used keys
+	 * @param {PackContentItems | function(): Promise<PackContentItems>} dataOrFn sync or async content
+	 * @param {Logger=} logger logger for logging
+	 * @param {string=} lazyName name of dataOrFn for logging
+	 */
+	constructor(items, usedItems, dataOrFn, logger, lazyName) {
+		this.items = items;
+		/** @type {function(): Promise<PackContentItems> | PackContentItems} */
+		this.lazy = typeof dataOrFn === "function" ? dataOrFn : undefined;
+		/** @type {Map<string, any>} */
+		this.content = typeof dataOrFn === "function" ? undefined : dataOrFn.map;
+		this.outdated = false;
+		this.used = usedItems;
+		this.logger = logger;
+		this.lazyName = lazyName;
+	}
+
+	get(identifier) {
+		this.used.add(identifier);
+		if (this.content) {
+			return this.content.get(identifier);
+		}
+
+		// We are in state B
+		const { lazyName } = this;
+		/** @type {string | undefined} */
+		let timeMessage;
+		if (lazyName) {
+			// only log once
+			this.lazyName = undefined;
+			timeMessage = `restore cache content ${lazyName} (${formatSize(
+				this.getSize()
+			)})`;
+			this.logger.log(
+				`starting to restore cache content ${lazyName} (${formatSize(
+					this.getSize()
+				)}) because of request to: ${identifier}`
+			);
+			this.logger.time(timeMessage);
+		}
+		const value = this.lazy();
+		if ("then" in value) {
+			return value.then(data => {
+				const map = data.map;
+				if (timeMessage) {
+					this.logger.timeEnd(timeMessage);
+				}
+				// Move to state C
+				this.content = map;
+				this.lazy = SerializerMiddleware.unMemoizeLazy(this.lazy);
+				return map.get(identifier);
+			});
+		} else {
+			const map = value.map;
+			if (timeMessage) {
+				this.logger.timeEnd(timeMessage);
+			}
+			// Move to state C
+			this.content = map;
+			this.lazy = SerializerMiddleware.unMemoizeLazy(this.lazy);
+			return map.get(identifier);
+		}
+	}
+
+	/**
+	 * @param {string} reason explanation why unpack is necessary
+	 * @returns {void | Promise<void>} maybe a promise if lazy
+	 */
+	unpack(reason) {
+		if (this.content) return;
+
+		// Move from state B to C
+		if (this.lazy) {
+			const { lazyName } = this;
+			/** @type {string | undefined} */
+			let timeMessage;
+			if (lazyName) {
+				// only log once
+				this.lazyName = undefined;
+				timeMessage = `unpack cache content ${lazyName} (${formatSize(
+					this.getSize()
+				)})`;
+				this.logger.log(
+					`starting to unpack cache content ${lazyName} (${formatSize(
+						this.getSize()
+					)}) because ${reason}`
+				);
+				this.logger.time(timeMessage);
+			}
+			const value = this.lazy();
+			if ("then" in value) {
+				return value.then(data => {
+					if (timeMessage) {
+						this.logger.timeEnd(timeMessage);
+					}
+					this.content = data.map;
+				});
+			} else {
+				if (timeMessage) {
+					this.logger.timeEnd(timeMessage);
+				}
+				this.content = value.map;
+			}
+		}
+	}
+
+	/**
+	 * @returns {number} size of the content or -1 if not known
+	 */
+	getSize() {
+		if (!this.lazy) return -1;
+		const options = /** @type {any} */ (this.lazy).options;
+		if (!options) return -1;
+		const size = options.size;
+		if (typeof size !== "number") return -1;
+		return size;
+	}
+
+	/**
+	 * @param {string} identifier identifier
+	 */
+	delete(identifier) {
+		this.items.delete(identifier);
+		this.used.delete(identifier);
+		this.outdated = true;
+	}
+
+	/**
+	 * @template T
+	 * @param {function(any): function(): Promise<PackContentItems> | PackContentItems} write write function
+	 * @returns {void}
+	 */
+	writeLazy(write) {
+		if (!this.outdated && this.lazy) {
+			// State B1 or C1
+			// this.lazy is still the valid deserialized version
+			write(this.lazy);
+			return;
+		}
+		if (!this.outdated && this.content) {
+			// State A1
+			const map = new Map(this.content);
+			// Move to state C1
+			this.lazy = SerializerMiddleware.unMemoizeLazy(
+				write(() => new PackContentItems(map))
+			);
+			return;
+		}
+		if (this.content) {
+			// State A2 or C2
+			/** @type {Map<string, any>} */
+			const map = new Map();
+			for (const item of this.items) {
+				map.set(item, this.content.get(item));
+			}
+			// Move to state C1
+			this.outdated = false;
+			this.content = map;
+			this.lazy = SerializerMiddleware.unMemoizeLazy(
+				write(() => new PackContentItems(map))
+			);
+			return;
+		}
+		// State B2
+		const { lazyName } = this;
+		/** @type {string | undefined} */
+		let timeMessage;
+		if (lazyName) {
+			// only log once
+			this.lazyName = undefined;
+			timeMessage = `unpack cache content ${lazyName} (${formatSize(
+				this.getSize()
+			)})`;
+			this.logger.log(
+				`starting to unpack cache content ${lazyName} (${formatSize(
+					this.getSize()
+				)}) because it's outdated and need to be serialized`
+			);
+			this.logger.time(timeMessage);
+		}
+		const value = this.lazy();
+		this.outdated = false;
+		if ("then" in value) {
+			// Move to state B1
+			this.lazy = write(() =>
+				value.then(data => {
+					if (timeMessage) {
+						this.logger.timeEnd(timeMessage);
+					}
+					const oldMap = data.map;
+					/** @type {Map<string, any>} */
+					const map = new Map();
+					for (const item of this.items) {
+						map.set(item, oldMap.get(item));
+					}
+					// Move to state C1 (or maybe C2)
+					this.content = map;
+					this.lazy = SerializerMiddleware.unMemoizeLazy(this.lazy);
+
+					return new PackContentItems(map);
+				})
+			);
+		} else {
+			// Move to state C1
+			if (timeMessage) {
+				this.logger.timeEnd(timeMessage);
+			}
+			const oldMap = value.map;
+			/** @type {Map<string, any>} */
+			const map = new Map();
+			for (const item of this.items) {
+				map.set(item, oldMap.get(item));
+			}
+			this.content = map;
+			this.lazy = write(() => new PackContentItems(map));
+		}
+	}
+}
+
+/**
+ * @param {Buffer} buf buffer
+ * @returns {Buffer} buffer that can be collected
+ */
+const allowCollectingMemory = buf => {
+	const wasted = buf.buffer.byteLength - buf.byteLength;
+	if (wasted > 8192 && (wasted > 1048576 || wasted > buf.byteLength)) {
+		return Buffer.from(buf);
+	}
+	return buf;
+};
+
+class PackFileCacheStrategy {
+	/**
+	 * @param {Object} options options
+	 * @param {Compiler} options.compiler the compiler
+	 * @param {IntermediateFileSystem} options.fs the filesystem
+	 * @param {string} options.context the context directory
+	 * @param {string} options.cacheLocation the location of the cache data
+	 * @param {string} options.version version identifier
+	 * @param {Logger} options.logger a logger
+	 * @param {SnapshotOptions} options.snapshot options regarding snapshotting
+	 * @param {number} options.maxAge max age of cache items
+	 * @param {boolean | undefined} options.profile track and log detailed timing information for individual cache items
+	 * @param {boolean | undefined} options.allowCollectingMemory allow to collect unused memory created during deserialization
+	 * @param {false | "gzip" | "brotli" | undefined} options.compression compression used
+	 * @param {boolean | undefined} options.readonly disable storing cache into filesystem
+	 */
+	constructor({
+		compiler,
+		fs,
+		context,
+		cacheLocation,
+		version,
+		logger,
+		snapshot,
+		maxAge,
+		profile,
+		allowCollectingMemory,
+		compression,
+		readonly
+	}) {
+		this.fileSerializer = createFileSerializer(
+			fs,
+			compiler.options.output.hashFunction
+		);
+		this.fileSystemInfo = new FileSystemInfo(fs, {
+			managedPaths: snapshot.managedPaths,
+			immutablePaths: snapshot.immutablePaths,
+			logger: logger.getChildLogger("webpack.FileSystemInfo"),
+			hashFunction: compiler.options.output.hashFunction
+		});
+		this.compiler = compiler;
+		this.context = context;
+		this.cacheLocation = cacheLocation;
+		this.version = version;
+		this.logger = logger;
+		this.maxAge = maxAge;
+		this.profile = profile;
+		this.readonly = readonly;
+		this.allowCollectingMemory = allowCollectingMemory;
+		this.compression = compression;
+		this._extension =
+			compression === "brotli"
+				? ".pack.br"
+				: compression === "gzip"
+				? ".pack.gz"
+				: ".pack";
+		this.snapshot = snapshot;
+		/** @type {Set<string>} */
+		this.buildDependencies = new Set();
+		/** @type {LazySet<string>} */
+		this.newBuildDependencies = new LazySet();
+		/** @type {Snapshot | undefined} */
+		this.resolveBuildDependenciesSnapshot = undefined;
+		/** @type {ResolveResults | undefined} */
+		this.resolveResults = undefined;
+		/** @type {Snapshot | undefined} */
+		this.buildSnapshot = undefined;
+		/** @type {Promise<Pack> | undefined} */
+		this.packPromise = this._openPack();
+		this.storePromise = Promise.resolve();
+	}
+
+	/**
+	 * @returns {Promise<Pack>} pack
+	 */
+	_getPack() {
+		if (this.packPromise === undefined) {
+			this.packPromise = this.storePromise.then(() => this._openPack());
+		}
+		return this.packPromise;
+	}
+
+	/**
+	 * @returns {Promise<Pack>} the pack
+	 */
+	_openPack() {
+		const { logger, profile, cacheLocation, version } = this;
+		/** @type {Snapshot} */
+		let buildSnapshot;
+		/** @type {Set<string>} */
+		let buildDependencies;
+		/** @type {Set<string>} */
+		let newBuildDependencies;
+		/** @type {Snapshot} */
+		let resolveBuildDependenciesSnapshot;
+		/** @type {ResolveResults | undefined} */
+		let resolveResults;
+		logger.time("restore cache container");
+		return this.fileSerializer
+			.deserialize(null, {
+				filename: `${cacheLocation}/index${this._extension}`,
+				extension: `${this._extension}`,
+				logger,
+				profile,
+				retainedBuffer: this.allowCollectingMemory
+					? allowCollectingMemory
+					: undefined
+			})
+			.catch(err => {
+				if (err.code !== "ENOENT") {
+					logger.warn(
+						`Restoring pack failed from ${cacheLocation}${this._extension}: ${err}`
+					);
+					logger.debug(err.stack);
+				} else {
+					logger.debug(
+						`No pack exists at ${cacheLocation}${this._extension}: ${err}`
+					);
+				}
+				return undefined;
+			})
+			.then(packContainer => {
+				logger.timeEnd("restore cache container");
+				if (!packContainer) return undefined;
+				if (!(packContainer instanceof PackContainer)) {
+					logger.warn(
+						`Restored pack from ${cacheLocation}${this._extension}, but contained content is unexpected.`,
+						packContainer
+					);
+					return undefined;
+				}
+				if (packContainer.version !== version) {
+					logger.log(
+						`Restored pack from ${cacheLocation}${this._extension}, but version doesn't match.`
+					);
+					return undefined;
+				}
+				logger.time("check build dependencies");
+				return Promise.all([
+					new Promise((resolve, reject) => {
+						this.fileSystemInfo.checkSnapshotValid(
+							packContainer.buildSnapshot,
+							(err, valid) => {
+								if (err) {
+									logger.log(
+										`Restored pack from ${cacheLocation}${this._extension}, but checking snapshot of build dependencies errored: ${err}.`
+									);
+									logger.debug(err.stack);
+									return resolve(false);
+								}
+								if (!valid) {
+									logger.log(
+										`Restored pack from ${cacheLocation}${this._extension}, but build dependencies have changed.`
+									);
+									return resolve(false);
+								}
+								buildSnapshot = packContainer.buildSnapshot;
+								return resolve(true);
+							}
+						);
+					}),
+					new Promise((resolve, reject) => {
+						this.fileSystemInfo.checkSnapshotValid(
+							packContainer.resolveBuildDependenciesSnapshot,
+							(err, valid) => {
+								if (err) {
+									logger.log(
+										`Restored pack from ${cacheLocation}${this._extension}, but checking snapshot of resolving of build dependencies errored: ${err}.`
+									);
+									logger.debug(err.stack);
+									return resolve(false);
+								}
+								if (valid) {
+									resolveBuildDependenciesSnapshot =
+										packContainer.resolveBuildDependenciesSnapshot;
+									buildDependencies = packContainer.buildDependencies;
+									resolveResults = packContainer.resolveResults;
+									return resolve(true);
+								}
+								logger.log(
+									"resolving of build dependencies is invalid, will re-resolve build dependencies"
+								);
+								this.fileSystemInfo.checkResolveResultsValid(
+									packContainer.resolveResults,
+									(err, valid) => {
+										if (err) {
+											logger.log(
+												`Restored pack from ${cacheLocation}${this._extension}, but resolving of build dependencies errored: ${err}.`
+											);
+											logger.debug(err.stack);
+											return resolve(false);
+										}
+										if (valid) {
+											newBuildDependencies = packContainer.buildDependencies;
+											resolveResults = packContainer.resolveResults;
+											return resolve(true);
+										}
+										logger.log(
+											`Restored pack from ${cacheLocation}${this._extension}, but build dependencies resolve to different locations.`
+										);
+										return resolve(false);
+									}
+								);
+							}
+						);
+					})
+				])
+					.catch(err => {
+						logger.timeEnd("check build dependencies");
+						throw err;
+					})
+					.then(([buildSnapshotValid, resolveValid]) => {
+						logger.timeEnd("check build dependencies");
+						if (buildSnapshotValid && resolveValid) {
+							logger.time("restore cache content metadata");
+							const d = packContainer.data();
+							logger.timeEnd("restore cache content metadata");
+							return d;
+						}
+						return undefined;
+					});
+			})
+			.then(pack => {
+				if (pack) {
+					pack.maxAge = this.maxAge;
+					this.buildSnapshot = buildSnapshot;
+					if (buildDependencies) this.buildDependencies = buildDependencies;
+					if (newBuildDependencies)
+						this.newBuildDependencies.addAll(newBuildDependencies);
+					this.resolveResults = resolveResults;
+					this.resolveBuildDependenciesSnapshot =
+						resolveBuildDependenciesSnapshot;
+					return pack;
+				}
+				return new Pack(logger, this.maxAge);
+			})
+			.catch(err => {
+				this.logger.warn(
+					`Restoring pack from ${cacheLocation}${this._extension} failed: ${err}`
+				);
+				this.logger.debug(err.stack);
+				return new Pack(logger, this.maxAge);
+			});
+	}
+
+	/**
+	 * @param {string} identifier unique name for the resource
+	 * @param {Etag | null} etag etag of the resource
+	 * @param {any} data cached content
+	 * @returns {Promise<void>} promise
+	 */
+	store(identifier, etag, data) {
+		if (this.readonly) return Promise.resolve();
+
+		return this._getPack().then(pack => {
+			pack.set(identifier, etag === null ? null : etag.toString(), data);
+		});
+	}
+
+	/**
+	 * @param {string} identifier unique name for the resource
+	 * @param {Etag | null} etag etag of the resource
+	 * @returns {Promise<any>} promise to the cached content
+	 */
+	restore(identifier, etag) {
+		return this._getPack()
+			.then(pack =>
+				pack.get(identifier, etag === null ? null : etag.toString())
+			)
+			.catch(err => {
+				if (err && err.code !== "ENOENT") {
+					this.logger.warn(
+						`Restoring failed for ${identifier} from pack: ${err}`
+					);
+					this.logger.debug(err.stack);
+				}
+			});
+	}
+
+	/**
+	 * @param {LazySet<string>} dependencies dependencies to store
+	 */
+	storeBuildDependencies(dependencies) {
+		if (this.readonly) return;
+		this.newBuildDependencies.addAll(dependencies);
+	}
+
+	afterAllStored() {
+		const packPromise = this.packPromise;
+		if (packPromise === undefined) return Promise.resolve();
+		const reportProgress = ProgressPlugin.getReporter(this.compiler);
+		return (this.storePromise = packPromise
+			.then(pack => {
+				pack.stopCapturingRequests();
+				if (!pack.invalid) return;
+				this.packPromise = undefined;
+				this.logger.log(`Storing pack...`);
+				let promise;
+				const newBuildDependencies = new Set();
+				for (const dep of this.newBuildDependencies) {
+					if (!this.buildDependencies.has(dep)) {
+						newBuildDependencies.add(dep);
+					}
+				}
+				if (newBuildDependencies.size > 0 || !this.buildSnapshot) {
+					if (reportProgress) reportProgress(0.5, "resolve build dependencies");
+					this.logger.debug(
+						`Capturing build dependencies... (${Array.from(
+							newBuildDependencies
+						).join(", ")})`
+					);
+					promise = new Promise((resolve, reject) => {
+						this.logger.time("resolve build dependencies");
+						this.fileSystemInfo.resolveBuildDependencies(
+							this.context,
+							newBuildDependencies,
+							(err, result) => {
+								this.logger.timeEnd("resolve build dependencies");
+								if (err) return reject(err);
+
+								this.logger.time("snapshot build dependencies");
+								const {
+									files,
+									directories,
+									missing,
+									resolveResults,
+									resolveDependencies
+								} = /** @type {ResolveBuildDependenciesResult} */ (result);
+								if (this.resolveResults) {
+									for (const [key, value] of resolveResults) {
+										this.resolveResults.set(key, value);
+									}
+								} else {
+									this.resolveResults = resolveResults;
+								}
+								if (reportProgress) {
+									reportProgress(
+										0.6,
+										"snapshot build dependencies",
+										"resolving"
+									);
+								}
+								this.fileSystemInfo.createSnapshot(
+									undefined,
+									resolveDependencies.files,
+									resolveDependencies.directories,
+									resolveDependencies.missing,
+									this.snapshot.resolveBuildDependencies,
+									(err, snapshot) => {
+										if (err) {
+											this.logger.timeEnd("snapshot build dependencies");
+											return reject(err);
+										}
+										if (!snapshot) {
+											this.logger.timeEnd("snapshot build dependencies");
+											return reject(
+												new Error("Unable to snapshot resolve dependencies")
+											);
+										}
+										if (this.resolveBuildDependenciesSnapshot) {
+											this.resolveBuildDependenciesSnapshot =
+												this.fileSystemInfo.mergeSnapshots(
+													this.resolveBuildDependenciesSnapshot,
+													snapshot
+												);
+										} else {
+											this.resolveBuildDependenciesSnapshot = snapshot;
+										}
+										if (reportProgress) {
+											reportProgress(
+												0.7,
+												"snapshot build dependencies",
+												"modules"
+											);
+										}
+										this.fileSystemInfo.createSnapshot(
+											undefined,
+											files,
+											directories,
+											missing,
+											this.snapshot.buildDependencies,
+											(err, snapshot) => {
+												this.logger.timeEnd("snapshot build dependencies");
+												if (err) return reject(err);
+												if (!snapshot) {
+													return reject(
+														new Error("Unable to snapshot build dependencies")
+													);
+												}
+												this.logger.debug("Captured build dependencies");
+
+												if (this.buildSnapshot) {
+													this.buildSnapshot =
+														this.fileSystemInfo.mergeSnapshots(
+															this.buildSnapshot,
+															snapshot
+														);
+												} else {
+													this.buildSnapshot = snapshot;
+												}
+
+												resolve();
+											}
+										);
+									}
+								);
+							}
+						);
+					});
+				} else {
+					promise = Promise.resolve();
+				}
+				return promise.then(() => {
+					if (reportProgress) reportProgress(0.8, "serialize pack");
+					this.logger.time(`store pack`);
+					const updatedBuildDependencies = new Set(this.buildDependencies);
+					for (const dep of newBuildDependencies) {
+						updatedBuildDependencies.add(dep);
+					}
+					const content = new PackContainer(
+						pack,
+						this.version,
+						/** @type {Snapshot} */ (this.buildSnapshot),
+						updatedBuildDependencies,
+						this.resolveResults,
+						this.resolveBuildDependenciesSnapshot
+					);
+					return this.fileSerializer
+						.serialize(content, {
+							filename: `${this.cacheLocation}/index${this._extension}`,
+							extension: `${this._extension}`,
+							logger: this.logger,
+							profile: this.profile
+						})
+						.then(() => {
+							for (const dep of newBuildDependencies) {
+								this.buildDependencies.add(dep);
+							}
+							this.newBuildDependencies.clear();
+							this.logger.timeEnd(`store pack`);
+							const stats = pack.getContentStats();
+							this.logger.log(
+								"Stored pack (%d items, %d files, %d MiB)",
+								pack.itemInfo.size,
+								stats.count,
+								Math.round(stats.size / 1024 / 1024)
+							);
+						})
+						.catch(err => {
+							this.logger.timeEnd(`store pack`);
+							this.logger.warn(`Caching failed for pack: ${err}`);
+							this.logger.debug(err.stack);
+						});
+				});
+			})
+			.catch(err => {
+				this.logger.warn(`Caching failed for pack: ${err}`);
+				this.logger.debug(err.stack);
+			}));
+	}
+
+	clear() {
+		this.fileSystemInfo.clear();
+		this.buildDependencies.clear();
+		this.newBuildDependencies.clear();
+		this.resolveBuildDependenciesSnapshot = undefined;
+		this.resolveResults = undefined;
+		this.buildSnapshot = undefined;
+		this.packPromise = undefined;
+	}
+}
+
+module.exports = PackFileCacheStrategy;