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app_vue/node_modules/webpack/lib/cache/ResolverCachePlugin.js

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+/*
+	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
+ */
+
+/**
+ * @template H
+ * @typedef {import("tapable").HookMapInterceptor<H>} HookMapInterceptor
+ */
+
+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;
+};
+
+/** @typedef {NonNullable<ResolveContext["yield"]>} Yield */
+
+const PLUGIN_NAME = "ResolverCachePlugin";
+
+class ResolverCachePlugin {
+	/**
+	 * Apply the plugin
+	 * @param {Compiler} compiler the compiler instance
+	 * @returns {void}
+	 */
+	apply(compiler) {
+		const cache = compiler.getCache(PLUGIN_NAME);
+		/** @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(PLUGIN_NAME, compilation => {
+			snapshotOptions = compilation.options.snapshot.resolve;
+			fileSystemInfo = compilation.fileSystemInfo;
+			compilation.hooks.finishModules.tap(PLUGIN_NAME, () => {
+				if (realResolves + cachedResolves > 0) {
+					const logger = compilation.getLogger(`webpack.${PLUGIN_NAME}`);
+					logger.log(
+						`${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 {(err?: Error | null, resolveRequest?: ResolveRequest | null) => 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) {
+				/** @typedef {(err?: Error, resolveRequest?: ResolveRequest) => void} ActiveRequest */
+				/** @type {Map<string, ActiveRequest[]>} */
+				const activeRequests = new Map();
+				/** @type {Map<string, [ActiveRequest[], Yield[]]>} */
+				const activeRequestsWithYield = new Map();
+				const hook =
+					/** @type {SyncHook<[Resolver, ResolveOptions, ResolveOptionsWithDependencyType]>} */
+					(_hook);
+				hook.tap(PLUGIN_NAME, (resolver, options, userOptions) => {
+					if (
+						/** @type {ResolveOptions & { cache: boolean }} */
+						(options).cache !== true
+					)
+						return;
+					const optionsIdent = objectToString(userOptions, false);
+					const cacheWithContext =
+						options.cacheWithContext !== undefined
+							? options.cacheWithContext
+							: false;
+					resolver.hooks.resolve.tapAsync(
+						{
+							name: PLUGIN_NAME,
+							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 {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 {Yield[] | undefined} */
+							let yields;
+
+							/**
+							 * @type {(err?: Error | null, result?: ResolveRequest | ResolveRequest[] | null) => void}
+							 */
+							const done = withYield
+								? (err, result) => {
+										if (callbacks === undefined) {
+											if (err) {
+												callback(err);
+											} else {
+												if (result)
+													for (const r of /** @type {ResolveRequest[]} */ (
+														result
+													)) {
+														/** @type {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 {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 {Yield} */ (resolveContext.yield)];
+								activeRequestsWithYield.set(identifier, [callbacks, yields]);
+							} else if (callbacks === undefined) {
+								callbacks = [callback];
+								activeRequests.set(identifier, callbacks);
+							}
+						}
+					);
+				});
+				return hook;
+			}
+		});
+	}
+}
+
+module.exports = ResolverCachePlugin;