MemoryCachePlugin.js
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MemoryCachePlugin.js
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			/*
			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 }>} */
			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();
			});
			}
			);
			}
			}
			module.exports = MemoryCachePlugin;