mirror of https://github.com/webpack/webpack.git
54 lines
1.4 KiB
JavaScript
54 lines
1.4 KiB
JavaScript
/*
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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 validateOptions = require("schema-utils");
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const schema = require("../schemas/plugins/HashedModuleIdsPlugin.json");
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class HashedModuleIdsPlugin {
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constructor(options) {
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validateOptions(schema, options || {}, "Hashed Module Ids Plugin");
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this.options = Object.assign(
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{
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context: null,
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hashFunction: "md4",
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hashDigest: "base64",
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hashDigestLength: 4
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},
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options
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);
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}
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apply(compiler) {
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const options = this.options;
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compiler.hooks.compilation.tap("HashedModuleIdsPlugin", compilation => {
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const usedIds = new Set();
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compilation.hooks.beforeModuleIds.tap(
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"HashedModuleIdsPlugin",
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modules => {
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for (const module of modules) {
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if (module.id === null && module.libIdent) {
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const id = module.libIdent({
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context: this.options.context || compiler.options.context
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});
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const hash = createHash(options.hashFunction);
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hash.update(id);
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const hashId = hash.digest(options.hashDigest);
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let len = options.hashDigestLength;
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while (usedIds.has(hashId.substr(0, len))) len++;
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module.id = hashId.substr(0, len);
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usedIds.add(module.id);
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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 = HashedModuleIdsPlugin;
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