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node_modules/webpack/lib/ids/HashedModuleIdsPlugin.js

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+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const { DEFAULTS } = require("../config/defaults");
+const {
+	compareModulesByPreOrderIndexOrIdentifier
+} = require("../util/comparators");
+const createSchemaValidation = require("../util/create-schema-validation");
+const createHash = require("../util/createHash");
+const {
+	getFullModuleName,
+	getUsedModuleIdsAndModules
+} = require("./IdHelpers");
+
+/** @typedef {import("../../declarations/plugins/ids/HashedModuleIdsPlugin").HashedModuleIdsPluginOptions} HashedModuleIdsPluginOptions */
+/** @typedef {import("../Compiler")} Compiler */
+
+const validate = createSchemaValidation(
+	require("../../schemas/plugins/ids/HashedModuleIdsPlugin.check"),
+	() => require("../../schemas/plugins/ids/HashedModuleIdsPlugin.json"),
+	{
+		name: "Hashed Module Ids Plugin",
+		baseDataPath: "options"
+	}
+);
+
+const PLUGIN_NAME = "HashedModuleIdsPlugin";
+
+class HashedModuleIdsPlugin {
+	/**
+	 * @param {HashedModuleIdsPluginOptions=} options options object
+	 */
+	constructor(options = {}) {
+		validate(options);
+
+		/** @type {Required<Omit<HashedModuleIdsPluginOptions, "context">> & { context?: string | undefined }} */
+		this.options = {
+			context: undefined,
+			hashFunction: DEFAULTS.HASH_FUNCTION,
+			hashDigest: "base64",
+			hashDigestLength: 4,
+			...options
+		};
+	}
+
+	/**
+	 * Apply the plugin
+	 * @param {Compiler} compiler the compiler instance
+	 * @returns {void}
+	 */
+	apply(compiler) {
+		compiler.hooks.compilation.tap(PLUGIN_NAME, (compilation) => {
+			compilation.hooks.moduleIds.tap(PLUGIN_NAME, () => {
+				const chunkGraph = compilation.chunkGraph;
+				const context = this.options.context
+					? this.options.context
+					: compiler.context;
+
+				const [usedIds, modules] = getUsedModuleIdsAndModules(compilation);
+				const modulesInNaturalOrder = modules.sort(
+					compareModulesByPreOrderIndexOrIdentifier(compilation.moduleGraph)
+				);
+				for (const module of modulesInNaturalOrder) {
+					const ident = getFullModuleName(module, context, compiler.root);
+					const hash = createHash(this.options.hashFunction);
+					hash.update(ident || "");
+					const hashId = hash.digest(this.options.hashDigest);
+					let len = this.options.hashDigestLength;
+					while (usedIds.has(hashId.slice(0, len))) {
+						/** @type {number} */ (len)++;
+					}
+					const moduleId = hashId.slice(0, len);
+					chunkGraph.setModuleId(module, moduleId);
+					usedIds.add(moduleId);
+				}
+			});
+		});
+	}
+}
+
+module.exports = HashedModuleIdsPlugin;