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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 RequestShortener = require("./RequestShortener");
const getHash = str => {
const hash = createHash("md4");
hash.update(str);
const digest = /** @type {string} */ (hash.digest("hex"));
return digest.substr(0, 4);
};
class NamedModulesPlugin {
constructor(options) {
this.options = options || {};
}
apply(compiler) {
compiler.hooks.compilation.tap("NamedModulesPlugin", compilation => {
compilation.hooks.beforeModuleIds.tap("NamedModulesPlugin", modules => {
const namedModules = new Map();
const context = this.options.context || compiler.options.context;
for (const module of modules) {
if (module.id === null && module.libIdent) {
module.id = module.libIdent({ context });
}
if (module.id !== null) {
const namedModule = namedModules.get(module.id);
if (namedModule !== undefined) {
namedModule.push(module);
} else {
namedModules.set(module.id, [module]);
}
}
}
for (const namedModule of namedModules.values()) {
if (namedModule.length > 1) {
for (const module of namedModule) {
const requestShortener = new RequestShortener(context);
module.id = `${module.id}?${getHash(
requestShortener.shorten(module.identifier())
)}`;
}
}
}
});
});
}
}
module.exports = NamedModulesPlugin;