/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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*/
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"use strict";
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const createHash = require("./util/createHash");
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const RequestShortener = require("./RequestShortener");
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const getHash = str => {
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const hash = createHash("md4");
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hash.update(str);
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const digest = /** @type {string} */ (hash.digest("hex"));
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return digest.substr(0, 4);
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};
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class NamedModulesPlugin {
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constructor(options) {
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this.options = options || {};
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}
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apply(compiler) {
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compiler.hooks.compilation.tap("NamedModulesPlugin", compilation => {
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compilation.hooks.beforeModuleIds.tap("NamedModulesPlugin", modules => {
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const namedModules = new Map();
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const context = this.options.context || compiler.options.context;
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for (const module of modules) {
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if (module.id === null && module.libIdent) {
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module.id = module.libIdent({ context });
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}
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if (module.id !== null) {
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const namedModule = namedModules.get(module.id);
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if (namedModule !== undefined) {
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namedModule.push(module);
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} else {
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namedModules.set(module.id, [module]);
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}
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}
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}
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for (const namedModule of namedModules.values()) {
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if (namedModule.length > 1) {
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for (const module of namedModule) {
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const requestShortener = new RequestShortener(context);
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module.id = `${module.id}?${getHash(
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requestShortener.shorten(module.identifier())
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)}`;
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}
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}
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}
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});
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});
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}
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}
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module.exports = NamedModulesPlugin;
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