HashedModuleIdsPlugin.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const createHash = require("crypto").createHash;
class HashedModuleIdsPlugin {
constructor(options) {
this.options = Object.assign({
hashFunction: "md5",
hashDigest: "base64",
hashDigestLength: 4
}, options);
}
apply(compiler) {
const options = this.options;
compiler.plugin("compilation", (compilation) => {
const usedIds = new Set();
compilation.plugin("before-module-ids", (modules) => {
modules.forEach((module) => {
if(module.id === null && module.libIdent) {
const id = module.libIdent({
context: this.options.context || compiler.options.context
});
const hash = createHash(options.hashFunction);
hash.update(id);
const hashId = hash.digest(options.hashDigest);
let len = options.hashDigestLength;
while(usedIds.has(hashId.substr(0, len)))
len++;
module.id = hashId.substr(0, len);
usedIds.add(module.id);
}
});
});
});
}
}
module.exports = HashedModuleIdsPlugin;