File size: 8,200 Bytes
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Object.defineProperty(exports, '__esModule', { value: true });
var worker_threads = require('worker_threads');
var smob = require('smob');
var terser$1 = require('terser');
var url = require('url');
var async_hooks = require('async_hooks');
var os = require('os');
var events = require('events');
var serializeJavascript = require('serialize-javascript');
var _documentCurrentScript = typeof document !== 'undefined' ? document.currentScript : null;
const taskInfo = Symbol('taskInfo');
const freeWorker = Symbol('freeWorker');
const workerPoolWorkerFlag = 'WorkerPoolWorker';
/**
* Duck typing worker context.
*
* @param input
*/
function isWorkerContextSerialized(input) {
return (smob.isObject(input) &&
smob.hasOwnProperty(input, 'code') &&
typeof input.code === 'string' &&
smob.hasOwnProperty(input, 'options') &&
typeof input.options === 'string');
}
function runWorker() {
if (worker_threads.isMainThread || !worker_threads.parentPort || worker_threads.workerData !== workerPoolWorkerFlag) {
return;
}
// eslint-disable-next-line no-eval
const eval2 = eval;
worker_threads.parentPort.on('message', async (data) => {
if (!isWorkerContextSerialized(data)) {
return;
}
const options = eval2(`(${data.options})`);
const result = await terser$1.minify(data.code, options);
const output = {
code: result.code || data.code,
nameCache: options.nameCache
};
if (typeof result.map === 'string') {
output.sourceMap = JSON.parse(result.map);
}
if (smob.isObject(result.map)) {
output.sourceMap = result.map;
}
worker_threads.parentPort === null || worker_threads.parentPort === void 0 ? void 0 : worker_threads.parentPort.postMessage(output);
});
}
class WorkerPoolTaskInfo extends async_hooks.AsyncResource {
constructor(callback) {
super('WorkerPoolTaskInfo');
this.callback = callback;
}
done(err, result) {
this.runInAsyncScope(this.callback, null, err, result);
this.emitDestroy();
}
}
class WorkerPool extends events.EventEmitter {
constructor(options) {
super();
this.tasks = [];
this.workers = [];
this.freeWorkers = [];
this.maxInstances = options.maxWorkers || os.cpus().length;
this.filePath = options.filePath;
this.on(freeWorker, () => {
if (this.tasks.length > 0) {
const { context, cb } = this.tasks.shift();
this.runTask(context, cb);
}
});
}
get numWorkers() {
return this.workers.length;
}
addAsync(context) {
return new Promise((resolve, reject) => {
this.runTask(context, (err, output) => {
if (err) {
reject(err);
return;
}
if (!output) {
reject(new Error('The output is empty'));
return;
}
resolve(output);
});
});
}
close() {
for (let i = 0; i < this.workers.length; i++) {
const worker = this.workers[i];
worker.terminate();
}
}
addNewWorker() {
const worker = new worker_threads.Worker(this.filePath, {
workerData: workerPoolWorkerFlag
});
worker.on('message', (result) => {
var _a;
(_a = worker[taskInfo]) === null || _a === void 0 ? void 0 : _a.done(null, result);
worker[taskInfo] = null;
this.freeWorkers.push(worker);
this.emit(freeWorker);
});
worker.on('error', (err) => {
if (worker[taskInfo]) {
worker[taskInfo].done(err, null);
}
else {
this.emit('error', err);
}
this.workers.splice(this.workers.indexOf(worker), 1);
this.addNewWorker();
});
this.workers.push(worker);
this.freeWorkers.push(worker);
this.emit(freeWorker);
}
runTask(context, cb) {
if (this.freeWorkers.length === 0) {
this.tasks.push({ context, cb });
if (this.numWorkers < this.maxInstances) {
this.addNewWorker();
}
return;
}
const worker = this.freeWorkers.pop();
if (worker) {
worker[taskInfo] = new WorkerPoolTaskInfo(cb);
worker.postMessage({
code: context.code,
options: serializeJavascript(context.options)
});
}
}
}
function terser(input = {}) {
const { maxWorkers, ...options } = input;
let workerPool;
let numOfChunks = 0;
let numOfWorkersUsed = 0;
return {
name: 'terser',
async renderChunk(code, chunk, outputOptions) {
if (!workerPool) {
workerPool = new WorkerPool({
filePath: url.fileURLToPath((typeof document === 'undefined' ? require('u' + 'rl').pathToFileURL(__filename).href : (_documentCurrentScript && _documentCurrentScript.src || new URL('index.js', document.baseURI).href))),
maxWorkers
});
}
numOfChunks += 1;
const defaultOptions = {
sourceMap: outputOptions.sourcemap === true || typeof outputOptions.sourcemap === 'string'
};
if (outputOptions.format === 'es') {
defaultOptions.module = true;
}
if (outputOptions.format === 'cjs') {
defaultOptions.toplevel = true;
}
try {
const { code: result, nameCache, sourceMap } = await workerPool.addAsync({
code,
options: smob.merge({}, options || {}, defaultOptions)
});
if (options.nameCache && nameCache) {
let vars = {
props: {}
};
if (smob.hasOwnProperty(options.nameCache, 'vars') && smob.isObject(options.nameCache.vars)) {
vars = smob.merge({}, options.nameCache.vars || {}, vars);
}
if (smob.hasOwnProperty(nameCache, 'vars') && smob.isObject(nameCache.vars)) {
vars = smob.merge({}, nameCache.vars, vars);
}
// eslint-disable-next-line no-param-reassign
options.nameCache.vars = vars;
let props = {};
if (smob.hasOwnProperty(options.nameCache, 'props') && smob.isObject(options.nameCache.props)) {
// eslint-disable-next-line prefer-destructuring
props = options.nameCache.props;
}
if (smob.hasOwnProperty(nameCache, 'props') && smob.isObject(nameCache.props)) {
props = smob.merge({}, nameCache.props, props);
}
// eslint-disable-next-line no-param-reassign
options.nameCache.props = props;
}
if ((!!defaultOptions.sourceMap || !!options.sourceMap) && smob.isObject(sourceMap)) {
return {
code: result,
map: sourceMap
};
}
return result;
}
catch (e) {
return Promise.reject(e);
}
finally {
numOfChunks -= 1;
if (numOfChunks === 0) {
numOfWorkersUsed = workerPool.numWorkers;
workerPool.close();
workerPool = null;
}
}
},
get numOfWorkersUsed() {
return numOfWorkersUsed;
}
};
}
runWorker();
exports.default = terser;
module.exports = Object.assign(exports.default, exports);
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