Index: imaps-frontend/node_modules/webpack/lib/cache/AddBuildDependenciesPlugin.js
===================================================================
--- imaps-frontend/node_modules/webpack/lib/cache/AddBuildDependenciesPlugin.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/webpack/lib/cache/AddBuildDependenciesPlugin.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,33 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+/** @typedef {import("../Compiler")} Compiler */
+
+class AddBuildDependenciesPlugin {
+	/**
+	 * @param {Iterable<string>} buildDependencies list of build dependencies
+	 */
+	constructor(buildDependencies) {
+		this.buildDependencies = new Set(buildDependencies);
+	}
+
+	/**
+	 * Apply the plugin
+	 * @param {Compiler} compiler the compiler instance
+	 * @returns {void}
+	 */
+	apply(compiler) {
+		compiler.hooks.compilation.tap(
+			"AddBuildDependenciesPlugin",
+			compilation => {
+				compilation.buildDependencies.addAll(this.buildDependencies);
+			}
+		);
+	}
+}
+
+module.exports = AddBuildDependenciesPlugin;
Index: imaps-frontend/node_modules/webpack/lib/cache/AddManagedPathsPlugin.js
===================================================================
--- imaps-frontend/node_modules/webpack/lib/cache/AddManagedPathsPlugin.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/webpack/lib/cache/AddManagedPathsPlugin.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,40 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+/** @typedef {import("../Compiler")} Compiler */
+
+class AddManagedPathsPlugin {
+	/**
+	 * @param {Iterable<string | RegExp>} managedPaths list of managed paths
+	 * @param {Iterable<string | RegExp>} immutablePaths list of immutable paths
+	 * @param {Iterable<string | RegExp>} unmanagedPaths list of unmanaged paths
+	 */
+	constructor(managedPaths, immutablePaths, unmanagedPaths) {
+		this.managedPaths = new Set(managedPaths);
+		this.immutablePaths = new Set(immutablePaths);
+		this.unmanagedPaths = new Set(unmanagedPaths);
+	}
+
+	/**
+	 * Apply the plugin
+	 * @param {Compiler} compiler the compiler instance
+	 * @returns {void}
+	 */
+	apply(compiler) {
+		for (const managedPath of this.managedPaths) {
+			compiler.managedPaths.add(managedPath);
+		}
+		for (const immutablePath of this.immutablePaths) {
+			compiler.immutablePaths.add(immutablePath);
+		}
+		for (const unmanagedPath of this.unmanagedPaths) {
+			compiler.unmanagedPaths.add(unmanagedPath);
+		}
+	}
+}
+
+module.exports = AddManagedPathsPlugin;
Index: imaps-frontend/node_modules/webpack/lib/cache/IdleFileCachePlugin.js
===================================================================
--- imaps-frontend/node_modules/webpack/lib/cache/IdleFileCachePlugin.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/webpack/lib/cache/IdleFileCachePlugin.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,240 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const Cache = require("../Cache");
+const ProgressPlugin = require("../ProgressPlugin");
+
+/** @typedef {import("../Compiler")} Compiler */
+/** @typedef {import("./PackFileCacheStrategy")} PackFileCacheStrategy */
+
+const BUILD_DEPENDENCIES_KEY = Symbol("build dependencies key");
+
+class IdleFileCachePlugin {
+	/**
+	 * @param {PackFileCacheStrategy} strategy cache strategy
+	 * @param {number} idleTimeout timeout
+	 * @param {number} idleTimeoutForInitialStore initial timeout
+	 * @param {number} idleTimeoutAfterLargeChanges timeout after changes
+	 */
+	constructor(
+		strategy,
+		idleTimeout,
+		idleTimeoutForInitialStore,
+		idleTimeoutAfterLargeChanges
+	) {
+		this.strategy = strategy;
+		this.idleTimeout = idleTimeout;
+		this.idleTimeoutForInitialStore = idleTimeoutForInitialStore;
+		this.idleTimeoutAfterLargeChanges = idleTimeoutAfterLargeChanges;
+	}
+
+	/**
+	 * Apply the plugin
+	 * @param {Compiler} compiler the compiler instance
+	 * @returns {void}
+	 */
+	apply(compiler) {
+		const strategy = this.strategy;
+		const idleTimeout = this.idleTimeout;
+		const idleTimeoutForInitialStore = Math.min(
+			idleTimeout,
+			this.idleTimeoutForInitialStore
+		);
+		const idleTimeoutAfterLargeChanges = this.idleTimeoutAfterLargeChanges;
+		const resolvedPromise = Promise.resolve();
+
+		let timeSpendInBuild = 0;
+		let timeSpendInStore = 0;
+		let avgTimeSpendInStore = 0;
+
+		/** @type {Map<string | typeof BUILD_DEPENDENCIES_KEY, () => Promise<void>>} */
+		const pendingIdleTasks = new Map();
+
+		compiler.cache.hooks.store.tap(
+			{ name: "IdleFileCachePlugin", stage: Cache.STAGE_DISK },
+			(identifier, etag, data) => {
+				pendingIdleTasks.set(identifier, () =>
+					strategy.store(identifier, etag, data)
+				);
+			}
+		);
+
+		compiler.cache.hooks.get.tapPromise(
+			{ name: "IdleFileCachePlugin", stage: Cache.STAGE_DISK },
+			(identifier, etag, gotHandlers) => {
+				const restore = () =>
+					strategy.restore(identifier, etag).then(cacheEntry => {
+						if (cacheEntry === undefined) {
+							gotHandlers.push((result, callback) => {
+								if (result !== undefined) {
+									pendingIdleTasks.set(identifier, () =>
+										strategy.store(identifier, etag, result)
+									);
+								}
+								callback();
+							});
+						} else {
+							return cacheEntry;
+						}
+					});
+				const pendingTask = pendingIdleTasks.get(identifier);
+				if (pendingTask !== undefined) {
+					pendingIdleTasks.delete(identifier);
+					return pendingTask().then(restore);
+				}
+				return restore();
+			}
+		);
+
+		compiler.cache.hooks.storeBuildDependencies.tap(
+			{ name: "IdleFileCachePlugin", stage: Cache.STAGE_DISK },
+			dependencies => {
+				pendingIdleTasks.set(BUILD_DEPENDENCIES_KEY, () =>
+					Promise.resolve().then(() =>
+						strategy.storeBuildDependencies(dependencies)
+					)
+				);
+			}
+		);
+
+		compiler.cache.hooks.shutdown.tapPromise(
+			{ name: "IdleFileCachePlugin", stage: Cache.STAGE_DISK },
+			() => {
+				if (idleTimer) {
+					clearTimeout(idleTimer);
+					idleTimer = undefined;
+				}
+				isIdle = false;
+				const reportProgress = ProgressPlugin.getReporter(compiler);
+				const jobs = Array.from(pendingIdleTasks.values());
+				if (reportProgress) reportProgress(0, "process pending cache items");
+				const promises = jobs.map(fn => fn());
+				pendingIdleTasks.clear();
+				promises.push(currentIdlePromise);
+				const promise = Promise.all(promises);
+				currentIdlePromise = promise.then(() => strategy.afterAllStored());
+				if (reportProgress) {
+					currentIdlePromise = currentIdlePromise.then(() => {
+						reportProgress(1, "stored");
+					});
+				}
+				return currentIdlePromise.then(() => {
+					// Reset strategy
+					if (strategy.clear) strategy.clear();
+				});
+			}
+		);
+
+		/** @type {Promise<any>} */
+		let currentIdlePromise = resolvedPromise;
+		let isIdle = false;
+		let isInitialStore = true;
+		const processIdleTasks = () => {
+			if (isIdle) {
+				const startTime = Date.now();
+				if (pendingIdleTasks.size > 0) {
+					const promises = [currentIdlePromise];
+					const maxTime = startTime + 100;
+					let maxCount = 100;
+					for (const [filename, factory] of pendingIdleTasks) {
+						pendingIdleTasks.delete(filename);
+						promises.push(factory());
+						if (maxCount-- <= 0 || Date.now() > maxTime) break;
+					}
+					currentIdlePromise = Promise.all(promises);
+					currentIdlePromise.then(() => {
+						timeSpendInStore += Date.now() - startTime;
+						// Allow to exit the process between
+						idleTimer = setTimeout(processIdleTasks, 0);
+						idleTimer.unref();
+					});
+					return;
+				}
+				currentIdlePromise = currentIdlePromise
+					.then(async () => {
+						await strategy.afterAllStored();
+						timeSpendInStore += Date.now() - startTime;
+						avgTimeSpendInStore =
+							Math.max(avgTimeSpendInStore, timeSpendInStore) * 0.9 +
+							timeSpendInStore * 0.1;
+						timeSpendInStore = 0;
+						timeSpendInBuild = 0;
+					})
+					.catch(err => {
+						const logger = compiler.getInfrastructureLogger(
+							"IdleFileCachePlugin"
+						);
+						logger.warn(`Background tasks during idle failed: ${err.message}`);
+						logger.debug(err.stack);
+					});
+				isInitialStore = false;
+			}
+		};
+		/** @type {ReturnType<typeof setTimeout> | undefined} */
+		let idleTimer;
+		compiler.cache.hooks.beginIdle.tap(
+			{ name: "IdleFileCachePlugin", stage: Cache.STAGE_DISK },
+			() => {
+				const isLargeChange = timeSpendInBuild > avgTimeSpendInStore * 2;
+				if (isInitialStore && idleTimeoutForInitialStore < idleTimeout) {
+					compiler
+						.getInfrastructureLogger("IdleFileCachePlugin")
+						.log(
+							`Initial cache was generated and cache will be persisted in ${
+								idleTimeoutForInitialStore / 1000
+							}s.`
+						);
+				} else if (
+					isLargeChange &&
+					idleTimeoutAfterLargeChanges < idleTimeout
+				) {
+					compiler
+						.getInfrastructureLogger("IdleFileCachePlugin")
+						.log(
+							`Spend ${Math.round(timeSpendInBuild) / 1000}s in build and ${
+								Math.round(avgTimeSpendInStore) / 1000
+							}s in average in cache store. This is considered as large change and cache will be persisted in ${
+								idleTimeoutAfterLargeChanges / 1000
+							}s.`
+						);
+				}
+				idleTimer = setTimeout(
+					() => {
+						idleTimer = undefined;
+						isIdle = true;
+						resolvedPromise.then(processIdleTasks);
+					},
+					Math.min(
+						isInitialStore ? idleTimeoutForInitialStore : Infinity,
+						isLargeChange ? idleTimeoutAfterLargeChanges : Infinity,
+						idleTimeout
+					)
+				);
+				idleTimer.unref();
+			}
+		);
+		compiler.cache.hooks.endIdle.tap(
+			{ name: "IdleFileCachePlugin", stage: Cache.STAGE_DISK },
+			() => {
+				if (idleTimer) {
+					clearTimeout(idleTimer);
+					idleTimer = undefined;
+				}
+				isIdle = false;
+			}
+		);
+		compiler.hooks.done.tap("IdleFileCachePlugin", stats => {
+			// 10% build overhead is ignored, as it's not cacheable
+			timeSpendInBuild *= 0.9;
+			timeSpendInBuild +=
+				/** @type {number} */ (stats.endTime) -
+				/** @type {number} */ (stats.startTime);
+		});
+	}
+}
+
+module.exports = IdleFileCachePlugin;
Index: imaps-frontend/node_modules/webpack/lib/cache/MemoryCachePlugin.js
===================================================================
--- imaps-frontend/node_modules/webpack/lib/cache/MemoryCachePlugin.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/webpack/lib/cache/MemoryCachePlugin.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,57 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const Cache = require("../Cache");
+
+/** @typedef {import("webpack-sources").Source} Source */
+/** @typedef {import("../Cache").Etag} Etag */
+/** @typedef {import("../Compiler")} Compiler */
+/** @typedef {import("../Module")} Module */
+
+class MemoryCachePlugin {
+	/**
+	 * Apply the plugin
+	 * @param {Compiler} compiler the compiler instance
+	 * @returns {void}
+	 */
+	apply(compiler) {
+		/** @type {Map<string, { etag: Etag | null, data: any } | null>} */
+		const cache = new Map();
+		compiler.cache.hooks.store.tap(
+			{ name: "MemoryCachePlugin", stage: Cache.STAGE_MEMORY },
+			(identifier, etag, data) => {
+				cache.set(identifier, { etag, data });
+			}
+		);
+		compiler.cache.hooks.get.tap(
+			{ name: "MemoryCachePlugin", stage: Cache.STAGE_MEMORY },
+			(identifier, etag, gotHandlers) => {
+				const cacheEntry = cache.get(identifier);
+				if (cacheEntry === null) {
+					return null;
+				} else if (cacheEntry !== undefined) {
+					return cacheEntry.etag === etag ? cacheEntry.data : null;
+				}
+				gotHandlers.push((result, callback) => {
+					if (result === undefined) {
+						cache.set(identifier, null);
+					} else {
+						cache.set(identifier, { etag, data: result });
+					}
+					return callback();
+				});
+			}
+		);
+		compiler.cache.hooks.shutdown.tap(
+			{ name: "MemoryCachePlugin", stage: Cache.STAGE_MEMORY },
+			() => {
+				cache.clear();
+			}
+		);
+	}
+}
+module.exports = MemoryCachePlugin;
Index: imaps-frontend/node_modules/webpack/lib/cache/MemoryWithGcCachePlugin.js
===================================================================
--- imaps-frontend/node_modules/webpack/lib/cache/MemoryWithGcCachePlugin.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/webpack/lib/cache/MemoryWithGcCachePlugin.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,135 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const Cache = require("../Cache");
+
+/** @typedef {import("webpack-sources").Source} Source */
+/** @typedef {import("../Cache").Etag} Etag */
+/** @typedef {import("../Compiler")} Compiler */
+/** @typedef {import("../Module")} Module */
+
+class MemoryWithGcCachePlugin {
+	/**
+	 * @param {object} options Options
+	 * @param {number} options.maxGenerations max generations
+	 */
+	constructor({ maxGenerations }) {
+		this._maxGenerations = maxGenerations;
+	}
+
+	/**
+	 * Apply the plugin
+	 * @param {Compiler} compiler the compiler instance
+	 * @returns {void}
+	 */
+	apply(compiler) {
+		const maxGenerations = this._maxGenerations;
+		/** @type {Map<string, { etag: Etag | null, data: any } | undefined | null>} */
+		const cache = new Map();
+		/** @type {Map<string, { entry: { etag: Etag | null, data: any } | null, until: number }>} */
+		const oldCache = new Map();
+		let generation = 0;
+		let cachePosition = 0;
+		const logger = compiler.getInfrastructureLogger("MemoryWithGcCachePlugin");
+		compiler.hooks.afterDone.tap("MemoryWithGcCachePlugin", () => {
+			generation++;
+			let clearedEntries = 0;
+			let lastClearedIdentifier;
+			// Avoid coverage problems due indirect changes
+			/* istanbul ignore next */
+			for (const [identifier, entry] of oldCache) {
+				if (entry.until > generation) break;
+
+				oldCache.delete(identifier);
+				if (cache.get(identifier) === undefined) {
+					cache.delete(identifier);
+					clearedEntries++;
+					lastClearedIdentifier = identifier;
+				}
+			}
+			if (clearedEntries > 0 || oldCache.size > 0) {
+				logger.log(
+					`${cache.size - oldCache.size} active entries, ${
+						oldCache.size
+					} recently unused cached entries${
+						clearedEntries > 0
+							? `, ${clearedEntries} old unused cache entries removed e. g. ${lastClearedIdentifier}`
+							: ""
+					}`
+				);
+			}
+			let i = (cache.size / maxGenerations) | 0;
+			let j = cachePosition >= cache.size ? 0 : cachePosition;
+			cachePosition = j + i;
+			for (const [identifier, entry] of cache) {
+				if (j !== 0) {
+					j--;
+					continue;
+				}
+				if (entry !== undefined) {
+					// We don't delete the cache entry, but set it to undefined instead
+					// This reserves the location in the data table and avoids rehashing
+					// when constantly adding and removing entries.
+					// It will be deleted when removed from oldCache.
+					cache.set(identifier, undefined);
+					oldCache.delete(identifier);
+					oldCache.set(identifier, {
+						entry,
+						until: generation + maxGenerations
+					});
+					if (i-- === 0) break;
+				}
+			}
+		});
+		compiler.cache.hooks.store.tap(
+			{ name: "MemoryWithGcCachePlugin", stage: Cache.STAGE_MEMORY },
+			(identifier, etag, data) => {
+				cache.set(identifier, { etag, data });
+			}
+		);
+		compiler.cache.hooks.get.tap(
+			{ name: "MemoryWithGcCachePlugin", stage: Cache.STAGE_MEMORY },
+			(identifier, etag, gotHandlers) => {
+				const cacheEntry = cache.get(identifier);
+				if (cacheEntry === null) {
+					return null;
+				} else if (cacheEntry !== undefined) {
+					return cacheEntry.etag === etag ? cacheEntry.data : null;
+				}
+				const oldCacheEntry = oldCache.get(identifier);
+				if (oldCacheEntry !== undefined) {
+					const cacheEntry = oldCacheEntry.entry;
+					if (cacheEntry === null) {
+						oldCache.delete(identifier);
+						cache.set(identifier, cacheEntry);
+						return null;
+					}
+					if (cacheEntry.etag !== etag) return null;
+					oldCache.delete(identifier);
+					cache.set(identifier, cacheEntry);
+					return cacheEntry.data;
+				}
+				gotHandlers.push((result, callback) => {
+					if (result === undefined) {
+						cache.set(identifier, null);
+					} else {
+						cache.set(identifier, { etag, data: result });
+					}
+					return callback();
+				});
+			}
+		);
+		compiler.cache.hooks.shutdown.tap(
+			{ name: "MemoryWithGcCachePlugin", stage: Cache.STAGE_MEMORY },
+			() => {
+				cache.clear();
+				oldCache.clear();
+			}
+		);
+	}
+}
+module.exports = MemoryWithGcCachePlugin;
Index: imaps-frontend/node_modules/webpack/lib/cache/PackFileCacheStrategy.js
===================================================================
--- imaps-frontend/node_modules/webpack/lib/cache/PackFileCacheStrategy.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/webpack/lib/cache/PackFileCacheStrategy.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,1539 @@
+/*
+	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 */
+/** @typedef {Set<string>} Items */
+/** @typedef {Set<string>} BuildDependencies */
+/** @typedef {Map<string, PackItemInfo>} ItemInfo */
+
+class PackContainer {
+	/**
+	 * @param {object} data stored data
+	 * @param {string} version version identifier
+	 * @param {Snapshot} buildSnapshot snapshot of all build dependencies
+	 * @param {BuildDependencies} 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;
+	}
+
+	/**
+	 * @param {ObjectSerializerContext} context context
+	 */
+	serialize({ write, writeLazy }) {
+		write(this.version);
+		write(this.buildSnapshot);
+		write(this.buildDependencies);
+		write(this.resolveResults);
+		write(this.resolveBuildDependenciesSnapshot);
+		/** @type {NonNullable<ObjectSerializerContext["writeLazy"]>} */
+		(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 | undefined} 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 {
+	/**
+	 * @param {Logger} logger a logger
+	 * @param {number} maxAge max age of cache items
+	 */
+	constructor(logger, maxAge) {
+		/** @type {ItemInfo} */
+		this.itemInfo = new Map();
+		/** @type {(string | undefined)[]} */
+		this.requests = [];
+		this.requestsTimeout = undefined;
+		/** @type {ItemInfo} */
+		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;
+		}
+		if (info.etag !== etag) return null;
+		info.lastAccess = Date.now();
+		const loc = info.location;
+		if (loc === -1) {
+			return info.freshValue;
+		}
+		if (!this.content[loc]) {
+			return;
+		}
+		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;
+	}
+
+	/**
+	 * @private
+	 * @param {Items} items items
+	 * @param {Items} usedItems used items
+	 * @param {number} newLoc new location
+	 */
+	_gcAndUpdateLocation(items, usedItems, newLoc) {
+		let count = 0;
+		let lastGC;
+		const now = Date.now();
+		for (const identifier of items) {
+			const info = /** @type {PackItemInfo} */ (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() {
+		/** @typedef {{ items: Items, map: Map<string, any>, loc: number }} PackItem */
+		const itemsCount = this.freshContent.size;
+		if (itemsCount > 0) {
+			const packCount = Math.ceil(itemsCount / MAX_ITEMS_IN_FRESH_PACK);
+			const itemsPerPack = Math.ceil(itemsCount / packCount);
+			/** @type {PackItem[]} */
+			const packs = [];
+			let i = 0;
+			let ignoreNextTimeTick = false;
+			const createNextPack = () => {
+				const loc = this._findLocation();
+				this.content[loc] = /** @type {EXPECTED_ANY} */ (null); // reserve
+				/** @type {PackItem} */
+				const pack = {
+					items: new Set(),
+					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 {Items} */
+		const mergedItems = new Set();
+		/** @type {Items} */
+		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 /** @type {Content} */ (
+					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 {Content} */
+					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,
+									/** @type {Content} */
+									(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,
+									/** @type {Content} */
+									(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;
+		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,
+									/** @type {Content} */
+									(content.content).get(identifier)
+								);
+							}
+							return new PackContentItems(map);
+						})
+					: undefined;
+		}
+	}
+
+	/**
+	 * @param {ObjectSerializerContext} context context
+	 */
+	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
+	}
+
+	/**
+	 * @param {ObjectDeserializerContext & { logger: Logger }} context context
+	 */
+	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,
+						`${this.content.length}`
+					)
+				);
+				for (const identifier of items) {
+					/** @type {PackItemInfo} */
+					(this.itemInfo.get(identifier)).location = idx;
+				}
+			}
+			items = read();
+		}
+	}
+}
+
+makeSerializable(Pack, "webpack/lib/cache/PackFileCacheStrategy", "Pack");
+
+/** @typedef {Map<string, any>} Content */
+
+class PackContentItems {
+	/**
+	 * @param {Content} map items
+	 */
+	constructor(map) {
+		this.map = map;
+	}
+
+	/**
+	 * @param {ObjectSerializerContext & { snapshot: TODO, rollback: TODO, logger: Logger, profile: boolean | undefined  }} context context
+	 */
+	serialize({ write, snapshot, rollback, logger, profile }) {
+		if (profile) {
+			write(false);
+			for (const [key, value] of this.map) {
+				const s = snapshot();
+				try {
+					write(key);
+					const start = process.hrtime();
+					write(value);
+					const durationHr = process.hrtime(start);
+					const duration = durationHr[0] * 1000 + durationHr[1] / 1e6;
+					if (duration > 1) {
+						if (duration > 500)
+							logger.error(`Serialization of '${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}': ${duration} ms`);
+					}
+				} catch (err) {
+					rollback(s);
+					if (err === NOT_SERIALIZABLE) continue;
+					const msg = "Skipped not serializable cache item";
+					const notSerializableErr = /** @type {Error} */ (err);
+					if (notSerializableErr.message.includes("ModuleBuildError")) {
+						logger.log(
+							`${msg} (in build error): ${notSerializableErr.message}`
+						);
+						logger.debug(
+							`${msg} '${key}' (in build error): ${notSerializableErr.stack}`
+						);
+					} else {
+						logger.warn(`${msg}: ${notSerializableErr.message}`);
+						logger.debug(`${msg} '${key}': ${notSerializableErr.stack}`);
+					}
+				}
+			}
+			write(null);
+			return;
+		}
+		// Try to serialize all at once
+		const s = snapshot();
+		try {
+			write(true);
+			write(this.map);
+		} catch (_err) {
+			rollback(s);
+
+			// Try to serialize each item on it's own
+			write(false);
+			for (const [key, value] of this.map) {
+				const s = snapshot();
+				try {
+					write(key);
+					write(value);
+				} catch (err) {
+					rollback(s);
+					if (err === NOT_SERIALIZABLE) continue;
+					const notSerializableErr = /** @type {Error} */ (err);
+					logger.warn(
+						`Skipped not serializable cache item '${key}': ${notSerializableErr.message}`
+					);
+					logger.debug(notSerializableErr.stack);
+				}
+			}
+			write(null);
+		}
+	}
+
+	/**
+	 * @param {ObjectDeserializerContext & { logger: Logger, profile: boolean | undefined }} context context
+	 */
+	deserialize({ read, logger, profile }) {
+		if (read()) {
+			this.map = read();
+		} else if (profile) {
+			const map = new Map();
+			let key = read();
+			while (key !== null) {
+				const start = process.hrtime();
+				const value = read();
+				const durationHr = process.hrtime(start);
+				const duration = durationHr[0] * 1000 + durationHr[1] / 1e6;
+				if (duration > 1) {
+					if (duration > 100)
+						logger.error(`Deserialization of '${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"
+);
+
+/** @typedef {(function(): Promise<PackContentItems> | PackContentItems)} LazyFn */
+
+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 {Items} items keys
+	 * @param {Items} 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 {LazyFn | undefined} */
+		this.lazy = typeof dataOrFn === "function" ? dataOrFn : undefined;
+		/** @type {Content | undefined} */
+		this.content = typeof dataOrFn === "function" ? undefined : dataOrFn.map;
+		this.outdated = false;
+		this.used = usedItems;
+		this.logger = logger;
+		this.lazyName = lazyName;
+	}
+
+	/**
+	 * @param {string} identifier identifier
+	 * @returns {string | Promise<string>} result
+	 */
+	get(identifier) {
+		this.used.add(identifier);
+		if (this.content) {
+			return this.content.get(identifier);
+		}
+
+		const logger = /** @type {Logger} */ (this.logger);
+		// 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()
+			)})`;
+			logger.log(
+				`starting to restore cache content ${lazyName} (${formatSize(
+					this.getSize()
+				)}) because of request to: ${identifier}`
+			);
+			logger.time(timeMessage);
+		}
+		const value = /** @type {LazyFn} */ (this.lazy)();
+		if ("then" in value) {
+			return value.then(data => {
+				const map = data.map;
+				if (timeMessage) {
+					logger.timeEnd(timeMessage);
+				}
+				// Move to state C
+				this.content = map;
+				this.lazy = SerializerMiddleware.unMemoizeLazy(
+					/** @type {LazyFn} */
+					(this.lazy)
+				);
+				return map.get(identifier);
+			});
+		}
+
+		const map = value.map;
+		if (timeMessage) {
+			logger.timeEnd(timeMessage);
+		}
+		// Move to state C
+		this.content = map;
+		this.lazy = SerializerMiddleware.unMemoizeLazy(
+			/** @type {LazyFn} */
+			(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;
+
+		const logger = /** @type {Logger} */ (this.logger);
+		// 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()
+				)})`;
+				logger.log(
+					`starting to unpack cache content ${lazyName} (${formatSize(
+						this.getSize()
+					)}) because ${reason}`
+				);
+				logger.time(timeMessage);
+			}
+			const value = this.lazy();
+			if ("then" in value) {
+				return value.then(data => {
+					if (timeMessage) {
+						logger.timeEnd(timeMessage);
+					}
+					this.content = data.map;
+				});
+			}
+			if (timeMessage) {
+				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 {Content} */
+			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;
+		}
+		const logger = /** @type {Logger} */ (this.logger);
+		// 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()
+			)})`;
+			logger.log(
+				`starting to unpack cache content ${lazyName} (${formatSize(
+					this.getSize()
+				)}) because it's outdated and need to be serialized`
+			);
+			logger.time(timeMessage);
+		}
+		const value = /** @type {LazyFn} */ (this.lazy)();
+		this.outdated = false;
+		if ("then" in value) {
+			// Move to state B1
+			this.lazy = write(() =>
+				value.then(data => {
+					if (timeMessage) {
+						logger.timeEnd(timeMessage);
+					}
+					const oldMap = data.map;
+					/** @type {Content} */
+					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(
+						/** @type {LazyFn} */
+						(this.lazy)
+					);
+
+					return new PackContentItems(map);
+				})
+			);
+		} else {
+			// Move to state C1
+			if (timeMessage) {
+				logger.timeEnd(timeMessage);
+			}
+			const oldMap = value.map;
+			/** @type {Content} */
+			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 {BuildDependencies} */
+		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 {BuildDependencies} */
+		let buildDependencies;
+		/** @type {BuildDependencies} */
+		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;
+				if (!(packContainer instanceof PackContainer)) {
+					logger.warn(
+						`Restored pack from ${cacheLocation}${this._extension}, but contained content is unexpected.`,
+						packContainer
+					);
+					return;
+				}
+				if (packContainer.version !== version) {
+					logger.log(
+						`Restored pack from ${cacheLocation}${this._extension}, but version doesn't match.`
+					);
+					return;
+				}
+				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: ${err}`
+					);
+					this.logger.debug(err.stack);
+				}
+			});
+	}
+
+	/**
+	 * @param {LazySet<string> | Iterable<string>} dependencies dependencies to store
+	 */
+	storeBuildDependencies(dependencies) {
+		if (this.readonly) return;
+		this.newBuildDependencies.addAll(dependencies);
+	}
+
+	afterAllStored() {
+		const packPromise = this.packPromise;
+		if (packPromise === undefined) return Promise.resolve();
+		const reportProgress = ProgressPlugin.getReporter(this.compiler);
+		return (this.storePromise = packPromise
+			.then(pack => {
+				pack.stopCapturingRequests();
+				if (!pack.invalid) return;
+				this.packPromise = undefined;
+				this.logger.log("Storing pack...");
+				let promise;
+				const newBuildDependencies = new Set();
+				for (const dep of this.newBuildDependencies) {
+					if (!this.buildDependencies.has(dep)) {
+						newBuildDependencies.add(dep);
+					}
+				}
+				if (newBuildDependencies.size > 0 || !this.buildSnapshot) {
+					if (reportProgress) reportProgress(0.5, "resolve build dependencies");
+					this.logger.debug(
+						`Capturing build dependencies... (${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,
+						/** @type {ResolveResults} */
+						(this.resolveResults),
+						/** @type {Snapshot} */
+						(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;
Index: imaps-frontend/node_modules/webpack/lib/cache/ResolverCachePlugin.js
===================================================================
--- imaps-frontend/node_modules/webpack/lib/cache/ResolverCachePlugin.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/webpack/lib/cache/ResolverCachePlugin.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,440 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const LazySet = require("../util/LazySet");
+const makeSerializable = require("../util/makeSerializable");
+
+/** @typedef {import("enhanced-resolve").ResolveContext} ResolveContext */
+/** @typedef {import("enhanced-resolve").ResolveOptions} ResolveOptions */
+/** @typedef {import("enhanced-resolve").ResolveRequest} ResolveRequest */
+/** @typedef {import("enhanced-resolve").Resolver} Resolver */
+/** @typedef {import("../CacheFacade").ItemCacheFacade} ItemCacheFacade */
+/** @typedef {import("../Compiler")} Compiler */
+/** @typedef {import("../FileSystemInfo")} FileSystemInfo */
+/** @typedef {import("../FileSystemInfo").Snapshot} Snapshot */
+/** @typedef {import("../FileSystemInfo").SnapshotOptions} SnapshotOptions */
+/** @typedef {import("../ResolverFactory").ResolveOptionsWithDependencyType} ResolveOptionsWithDependencyType */
+/** @typedef {import("../serialization/ObjectMiddleware").ObjectDeserializerContext} ObjectDeserializerContext */
+/** @typedef {import("../serialization/ObjectMiddleware").ObjectSerializerContext} ObjectSerializerContext */
+
+/**
+ * @template T
+ * @typedef {import("tapable").SyncHook<T>} SyncHook
+ */
+
+class CacheEntry {
+	/**
+	 * @param {ResolveRequest} result result
+	 * @param {Snapshot} snapshot snapshot
+	 */
+	constructor(result, snapshot) {
+		this.result = result;
+		this.snapshot = snapshot;
+	}
+
+	/**
+	 * @param {ObjectSerializerContext} context context
+	 */
+	serialize({ write }) {
+		write(this.result);
+		write(this.snapshot);
+	}
+
+	/**
+	 * @param {ObjectDeserializerContext} context context
+	 */
+	deserialize({ read }) {
+		this.result = read();
+		this.snapshot = read();
+	}
+}
+
+makeSerializable(CacheEntry, "webpack/lib/cache/ResolverCachePlugin");
+
+/**
+ * @template T
+ * @param {Set<T> | LazySet<T>} set set to add items to
+ * @param {Set<T> | LazySet<T> | Iterable<T>} otherSet set to add items from
+ * @returns {void}
+ */
+const addAllToSet = (set, otherSet) => {
+	if (set instanceof LazySet) {
+		set.addAll(otherSet);
+	} else {
+		for (const item of otherSet) {
+			set.add(item);
+		}
+	}
+};
+
+/**
+ * @template {object} T
+ * @param {T} object an object
+ * @param {boolean} excludeContext if true, context is not included in string
+ * @returns {string} stringified version
+ */
+const objectToString = (object, excludeContext) => {
+	let str = "";
+	for (const key in object) {
+		if (excludeContext && key === "context") continue;
+		const value = object[key];
+		str +=
+			typeof value === "object" && value !== null
+				? `|${key}=[${objectToString(value, false)}|]`
+				: `|${key}=|${value}`;
+	}
+	return str;
+};
+
+class ResolverCachePlugin {
+	/**
+	 * Apply the plugin
+	 * @param {Compiler} compiler the compiler instance
+	 * @returns {void}
+	 */
+	apply(compiler) {
+		const cache = compiler.getCache("ResolverCachePlugin");
+		/** @type {FileSystemInfo} */
+		let fileSystemInfo;
+		/** @type {SnapshotOptions | undefined} */
+		let snapshotOptions;
+		let realResolves = 0;
+		let cachedResolves = 0;
+		let cacheInvalidResolves = 0;
+		let concurrentResolves = 0;
+		compiler.hooks.thisCompilation.tap("ResolverCachePlugin", compilation => {
+			snapshotOptions = compilation.options.snapshot.resolve;
+			fileSystemInfo = compilation.fileSystemInfo;
+			compilation.hooks.finishModules.tap("ResolverCachePlugin", () => {
+				if (realResolves + cachedResolves > 0) {
+					const logger = compilation.getLogger("webpack.ResolverCachePlugin");
+					logger.log(
+						`${Math.round(
+							(100 * realResolves) / (realResolves + cachedResolves)
+						)}% really resolved (${realResolves} real resolves with ${cacheInvalidResolves} cached but invalid, ${cachedResolves} cached valid, ${concurrentResolves} concurrent)`
+					);
+					realResolves = 0;
+					cachedResolves = 0;
+					cacheInvalidResolves = 0;
+					concurrentResolves = 0;
+				}
+			});
+		});
+
+		/** @typedef {function((Error | null)=, ResolveRequest=): void} Callback */
+		/** @typedef {ResolveRequest & { _ResolverCachePluginCacheMiss: true }} ResolveRequestWithCacheMiss */
+
+		/**
+		 * @param {ItemCacheFacade} itemCache cache
+		 * @param {Resolver} resolver the resolver
+		 * @param {ResolveContext} resolveContext context for resolving meta info
+		 * @param {ResolveRequest} request the request info object
+		 * @param {Callback} callback callback function
+		 * @returns {void}
+		 */
+		const doRealResolve = (
+			itemCache,
+			resolver,
+			resolveContext,
+			request,
+			callback
+		) => {
+			realResolves++;
+			const newRequest =
+				/** @type {ResolveRequestWithCacheMiss} */
+				({
+					_ResolverCachePluginCacheMiss: true,
+					...request
+				});
+			/** @type {ResolveContext} */
+			const newResolveContext = {
+				...resolveContext,
+				stack: new Set(),
+				/** @type {LazySet<string>} */
+				missingDependencies: new LazySet(),
+				/** @type {LazySet<string>} */
+				fileDependencies: new LazySet(),
+				/** @type {LazySet<string>} */
+				contextDependencies: new LazySet()
+			};
+			/** @type {ResolveRequest[] | undefined} */
+			let yieldResult;
+			let withYield = false;
+			if (typeof newResolveContext.yield === "function") {
+				yieldResult = [];
+				withYield = true;
+				newResolveContext.yield = obj =>
+					/** @type {ResolveRequest[]} */
+					(yieldResult).push(obj);
+			}
+			/**
+			 * @param {"fileDependencies" | "contextDependencies" | "missingDependencies"} key key
+			 */
+			const propagate = key => {
+				if (resolveContext[key]) {
+					addAllToSet(
+						/** @type {Set<string>} */ (resolveContext[key]),
+						/** @type {Set<string>} */ (newResolveContext[key])
+					);
+				}
+			};
+			const resolveTime = Date.now();
+			resolver.doResolve(
+				resolver.hooks.resolve,
+				newRequest,
+				"Cache miss",
+				newResolveContext,
+				(err, result) => {
+					propagate("fileDependencies");
+					propagate("contextDependencies");
+					propagate("missingDependencies");
+					if (err) return callback(err);
+					const fileDependencies = newResolveContext.fileDependencies;
+					const contextDependencies = newResolveContext.contextDependencies;
+					const missingDependencies = newResolveContext.missingDependencies;
+					fileSystemInfo.createSnapshot(
+						resolveTime,
+						/** @type {Set<string>} */
+						(fileDependencies),
+						/** @type {Set<string>} */
+						(contextDependencies),
+						/** @type {Set<string>} */
+						(missingDependencies),
+						snapshotOptions,
+						(err, snapshot) => {
+							if (err) return callback(err);
+							const resolveResult = withYield ? yieldResult : result;
+							// since we intercept resolve hook
+							// we still can get result in callback
+							if (withYield && result)
+								/** @type {ResolveRequest[]} */ (yieldResult).push(result);
+							if (!snapshot) {
+								if (resolveResult)
+									return callback(
+										null,
+										/** @type {ResolveRequest} */
+										(resolveResult)
+									);
+								return callback();
+							}
+							itemCache.store(
+								new CacheEntry(
+									/** @type {ResolveRequest} */
+									(resolveResult),
+									snapshot
+								),
+								storeErr => {
+									if (storeErr) return callback(storeErr);
+									if (resolveResult)
+										return callback(
+											null,
+											/** @type {ResolveRequest} */
+											(resolveResult)
+										);
+									callback();
+								}
+							);
+						}
+					);
+				}
+			);
+		};
+		compiler.resolverFactory.hooks.resolver.intercept({
+			factory(type, hook) {
+				/** @type {Map<string, (function(Error=, ResolveRequest=): void)[]>} */
+				const activeRequests = new Map();
+				/** @type {Map<string, [function(Error=, ResolveRequest=): void, NonNullable<ResolveContext["yield"]>][]>} */
+				const activeRequestsWithYield = new Map();
+				/** @type {SyncHook<[Resolver, ResolveOptions, ResolveOptionsWithDependencyType]>} */
+				(hook).tap("ResolverCachePlugin", (resolver, options, userOptions) => {
+					if (/** @type {TODO} */ (options).cache !== true) return;
+					const optionsIdent = objectToString(userOptions, false);
+					const cacheWithContext =
+						options.cacheWithContext !== undefined
+							? options.cacheWithContext
+							: false;
+					resolver.hooks.resolve.tapAsync(
+						{
+							name: "ResolverCachePlugin",
+							stage: -100
+						},
+						(request, resolveContext, callback) => {
+							if (
+								/** @type {ResolveRequestWithCacheMiss} */
+								(request)._ResolverCachePluginCacheMiss ||
+								!fileSystemInfo
+							) {
+								return callback();
+							}
+							const withYield = typeof resolveContext.yield === "function";
+							const identifier = `${type}${
+								withYield ? "|yield" : "|default"
+							}${optionsIdent}${objectToString(request, !cacheWithContext)}`;
+
+							if (withYield) {
+								const activeRequest = activeRequestsWithYield.get(identifier);
+								if (activeRequest) {
+									activeRequest[0].push(callback);
+									activeRequest[1].push(
+										/** @type {NonNullable<ResolveContext["yield"]>} */
+										(resolveContext.yield)
+									);
+									return;
+								}
+							} else {
+								const activeRequest = activeRequests.get(identifier);
+								if (activeRequest) {
+									activeRequest.push(callback);
+									return;
+								}
+							}
+							const itemCache = cache.getItemCache(identifier, null);
+							/** @type {Callback[] | false | undefined} */
+							let callbacks;
+							/** @type {NonNullable<ResolveContext["yield"]>[] | undefined} */
+							let yields;
+
+							/**
+							 * @type {function((Error | null)=, ResolveRequest | ResolveRequest[]=): void}
+							 */
+							const done = withYield
+								? (err, result) => {
+										if (callbacks === undefined) {
+											if (err) {
+												callback(err);
+											} else {
+												if (result)
+													for (const r of /** @type {ResolveRequest[]} */ (
+														result
+													)) {
+														/** @type {NonNullable<ResolveContext["yield"]>} */
+														(resolveContext.yield)(r);
+													}
+												callback(null, null);
+											}
+											yields = undefined;
+											callbacks = false;
+										} else {
+											const definedCallbacks =
+												/** @type {Callback[]} */
+												(callbacks);
+
+											if (err) {
+												for (const cb of definedCallbacks) cb(err);
+											} else {
+												for (let i = 0; i < definedCallbacks.length; i++) {
+													const cb = definedCallbacks[i];
+													const yield_ =
+														/** @type {NonNullable<ResolveContext["yield"]>[]} */
+														(yields)[i];
+													if (result)
+														for (const r of /** @type {ResolveRequest[]} */ (
+															result
+														))
+															yield_(r);
+													cb(null, null);
+												}
+											}
+											activeRequestsWithYield.delete(identifier);
+											yields = undefined;
+											callbacks = false;
+										}
+									}
+								: (err, result) => {
+										if (callbacks === undefined) {
+											callback(err, /** @type {ResolveRequest} */ (result));
+											callbacks = false;
+										} else {
+											for (const callback of /** @type {Callback[]} */ (
+												callbacks
+											)) {
+												callback(err, /** @type {ResolveRequest} */ (result));
+											}
+											activeRequests.delete(identifier);
+											callbacks = false;
+										}
+									};
+							/**
+							 * @param {(Error | null)=} err error if any
+							 * @param {(CacheEntry | null)=} cacheEntry cache entry
+							 * @returns {void}
+							 */
+							const processCacheResult = (err, cacheEntry) => {
+								if (err) return done(err);
+
+								if (cacheEntry) {
+									const { snapshot, result } = cacheEntry;
+									fileSystemInfo.checkSnapshotValid(snapshot, (err, valid) => {
+										if (err || !valid) {
+											cacheInvalidResolves++;
+											return doRealResolve(
+												itemCache,
+												resolver,
+												resolveContext,
+												request,
+												done
+											);
+										}
+										cachedResolves++;
+										if (resolveContext.missingDependencies) {
+											addAllToSet(
+												/** @type {Set<string>} */
+												(resolveContext.missingDependencies),
+												snapshot.getMissingIterable()
+											);
+										}
+										if (resolveContext.fileDependencies) {
+											addAllToSet(
+												/** @type {Set<string>} */
+												(resolveContext.fileDependencies),
+												snapshot.getFileIterable()
+											);
+										}
+										if (resolveContext.contextDependencies) {
+											addAllToSet(
+												/** @type {Set<string>} */
+												(resolveContext.contextDependencies),
+												snapshot.getContextIterable()
+											);
+										}
+										done(null, result);
+									});
+								} else {
+									doRealResolve(
+										itemCache,
+										resolver,
+										resolveContext,
+										request,
+										done
+									);
+								}
+							};
+							itemCache.get(processCacheResult);
+							if (withYield && callbacks === undefined) {
+								callbacks = [callback];
+								yields = [
+									/** @type {NonNullable<ResolveContext["yield"]>} */
+									(resolveContext.yield)
+								];
+								activeRequestsWithYield.set(
+									identifier,
+									/** @type {[any, any]} */ ([callbacks, yields])
+								);
+							} else if (callbacks === undefined) {
+								callbacks = [callback];
+								activeRequests.set(identifier, callbacks);
+							}
+						}
+					);
+				});
+				return hook;
+			}
+		});
+	}
+}
+
+module.exports = ResolverCachePlugin;
Index: imaps-frontend/node_modules/webpack/lib/cache/getLazyHashedEtag.js
===================================================================
--- imaps-frontend/node_modules/webpack/lib/cache/getLazyHashedEtag.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/webpack/lib/cache/getLazyHashedEtag.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,81 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const createHash = require("../util/createHash");
+
+/** @typedef {import("../util/Hash")} Hash */
+/** @typedef {typeof import("../util/Hash")} HashConstructor */
+
+/**
+ * @typedef {object} HashableObject
+ * @property {function(Hash): void} updateHash
+ */
+
+class LazyHashedEtag {
+	/**
+	 * @param {HashableObject} obj object with updateHash method
+	 * @param {string | HashConstructor} hashFunction the hash function to use
+	 */
+	constructor(obj, hashFunction = "md4") {
+		this._obj = obj;
+		this._hash = undefined;
+		this._hashFunction = hashFunction;
+	}
+
+	/**
+	 * @returns {string} hash of object
+	 */
+	toString() {
+		if (this._hash === undefined) {
+			const hash = createHash(this._hashFunction);
+			this._obj.updateHash(hash);
+			this._hash = /** @type {string} */ (hash.digest("base64"));
+		}
+		return this._hash;
+	}
+}
+
+/** @type {Map<string | HashConstructor, WeakMap<HashableObject, LazyHashedEtag>>} */
+const mapStrings = new Map();
+
+/** @type {WeakMap<HashConstructor, WeakMap<HashableObject, LazyHashedEtag>>} */
+const mapObjects = new WeakMap();
+
+/**
+ * @param {HashableObject} obj object with updateHash method
+ * @param {(string | HashConstructor)=} hashFunction the hash function to use
+ * @returns {LazyHashedEtag} etag
+ */
+const getter = (obj, hashFunction = "md4") => {
+	let innerMap;
+	if (typeof hashFunction === "string") {
+		innerMap = mapStrings.get(hashFunction);
+		if (innerMap === undefined) {
+			const newHash = new LazyHashedEtag(obj, hashFunction);
+			innerMap = new WeakMap();
+			innerMap.set(obj, newHash);
+			mapStrings.set(hashFunction, innerMap);
+			return newHash;
+		}
+	} else {
+		innerMap = mapObjects.get(hashFunction);
+		if (innerMap === undefined) {
+			const newHash = new LazyHashedEtag(obj, hashFunction);
+			innerMap = new WeakMap();
+			innerMap.set(obj, newHash);
+			mapObjects.set(hashFunction, innerMap);
+			return newHash;
+		}
+	}
+	const hash = innerMap.get(obj);
+	if (hash !== undefined) return hash;
+	const newHash = new LazyHashedEtag(obj, hashFunction);
+	innerMap.set(obj, newHash);
+	return newHash;
+};
+
+module.exports = getter;
Index: imaps-frontend/node_modules/webpack/lib/cache/mergeEtags.js
===================================================================
--- imaps-frontend/node_modules/webpack/lib/cache/mergeEtags.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
+++ imaps-frontend/node_modules/webpack/lib/cache/mergeEtags.js	(revision 79a03170cdde4e801d12257ee86723774970427b)
@@ -0,0 +1,69 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+/** @typedef {import("../Cache").Etag} Etag */
+
+class MergedEtag {
+	/**
+	 * @param {Etag} a first
+	 * @param {Etag} b second
+	 */
+	constructor(a, b) {
+		this.a = a;
+		this.b = b;
+	}
+
+	toString() {
+		return `${this.a.toString()}|${this.b.toString()}`;
+	}
+}
+
+const dualObjectMap = new WeakMap();
+const objectStringMap = new WeakMap();
+
+/**
+ * @param {Etag} a first
+ * @param {Etag} b second
+ * @returns {Etag} result
+ */
+const mergeEtags = (a, b) => {
+	if (typeof a === "string") {
+		if (typeof b === "string") {
+			return `${a}|${b}`;
+		}
+		const temp = b;
+		b = a;
+		a = temp;
+	} else if (typeof b !== "string") {
+		// both a and b are objects
+		let map = dualObjectMap.get(a);
+		if (map === undefined) {
+			dualObjectMap.set(a, (map = new WeakMap()));
+		}
+		const mergedEtag = map.get(b);
+		if (mergedEtag === undefined) {
+			const newMergedEtag = new MergedEtag(a, b);
+			map.set(b, newMergedEtag);
+			return newMergedEtag;
+		}
+		return mergedEtag;
+	}
+	// a is object, b is string
+	let map = objectStringMap.get(a);
+	if (map === undefined) {
+		objectStringMap.set(a, (map = new Map()));
+	}
+	const mergedEtag = map.get(b);
+	if (mergedEtag === undefined) {
+		const newMergedEtag = new MergedEtag(a, b);
+		map.set(b, newMergedEtag);
+		return newMergedEtag;
+	}
+	return mergedEtag;
+};
+
+module.exports = mergeEtags;
