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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const createHash = require("./util/createHash");
const validateOptions = require("schema-utils");
const schema = require("../schemas/plugins/HashedModuleIdsPlugin.json");
class HashedModuleIdsPlugin {
constructor(options) {
validateOptions(schema, options || {}, "Hashed Module Ids Plugin");
this.options = Object.assign(
{
context: null,
hashFunction: "md4",
hashDigest: "base64",
hashDigestLength: 4
},
options
);
}
apply(compiler) {
const options = this.options;
compiler.hooks.compilation.tap("HashedModuleIdsPlugin", compilation => {
const usedIds = new Set();
compilation.hooks.beforeModuleIds.tap(
"HashedModuleIdsPlugin",
modules => {
for (const module of modules) {
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;
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