source: imaps-frontend/node_modules/webpack/lib/ids/HashedModuleIdsPlugin.js@ 79a0317

/*
        MIT License http://www.opensource.org/licenses/mit-license.php
        Author Tobias Koppers @sokra
*/

"use strict";

const {
        compareModulesByPreOrderIndexOrIdentifier
} = require("../util/comparators");
const createSchemaValidation = require("../util/create-schema-validation");
const createHash = require("../util/createHash");
const {
        getUsedModuleIdsAndModules,
        getFullModuleName
} = require("./IdHelpers");

/** @typedef {import("../../declarations/plugins/HashedModuleIdsPlugin").HashedModuleIdsPluginOptions} HashedModuleIdsPluginOptions */
/** @typedef {import("../Compiler")} Compiler */

const validate = createSchemaValidation(
        require("../../schemas/plugins/HashedModuleIdsPlugin.check.js"),
        () => require("../../schemas/plugins/HashedModuleIdsPlugin.json"),
        {
                name: "Hashed Module Ids Plugin",
                baseDataPath: "options"
        }
);

class HashedModuleIdsPlugin {
        /**
         * @param {HashedModuleIdsPluginOptions=} options options object
         */
        constructor(options = {}) {
                validate(options);

                /** @type {HashedModuleIdsPluginOptions} */
                this.options = {
                        context: undefined,
                        hashFunction: "md4",
                        hashDigest: "base64",
                        hashDigestLength: 4,
                        ...options
                };
        }

        /**
         * Apply the plugin
         * @param {Compiler} compiler the compiler instance
         * @returns {void}
         */
        apply(compiler) {
                const options = this.options;
                compiler.hooks.compilation.tap("HashedModuleIdsPlugin", compilation => {
                        compilation.hooks.moduleIds.tap("HashedModuleIdsPlugin", () => {
                                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(
                                                /** @type {NonNullable<HashedModuleIdsPluginOptions["hashFunction"]>} */ (
                                                        options.hashFunction
                                                )
                                        );
                                        hash.update(ident || "");
                                        const hashId = /** @type {string} */ (
                                                hash.digest(options.hashDigest)
                                        );
                                        let len = 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;