Website Structure

Frontend-Learner/node_modules/@rollup/plugin-terser/src/constants.ts

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+export const taskInfo = Symbol('taskInfo');
+export const freeWorker = Symbol('freeWorker');
+export const workerPoolWorkerFlag = 'WorkerPoolWorker';

Frontend-Learner/node_modules/@rollup/plugin-terser/src/index.ts

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+import { runWorker } from './worker';
+import terser from './module';
+
+runWorker();
+
+export * from './type';
+
+export default terser;

Frontend-Learner/node_modules/@rollup/plugin-terser/src/module.ts

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+import { fileURLToPath } from 'url';
+
+import type { NormalizedOutputOptions, RenderedChunk } from 'rollup';
+import { hasOwnProperty, isObject, merge } from 'smob';
+
+import type { Options } from './type';
+import { WorkerPool } from './worker-pool';
+
+export default function terser(input: Options = {}) {
+  const { maxWorkers, ...options } = input;
+
+  let workerPool: WorkerPool | null | undefined;
+  let numOfChunks = 0;
+  let numOfWorkersUsed = 0;
+
+  return {
+    name: 'terser',
+
+    async renderChunk(code: string, chunk: RenderedChunk, outputOptions: NormalizedOutputOptions) {
+      if (!workerPool) {
+        workerPool = new WorkerPool({
+          filePath: fileURLToPath(import.meta.url),
+          maxWorkers
+        });
+      }
+
+      numOfChunks += 1;
+
+      const defaultOptions: Options = {
+        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: merge({}, options || {}, defaultOptions)
+        });
+
+        if (options.nameCache && nameCache) {
+          let vars: Record<string, any> = {
+            props: {}
+          };
+
+          if (hasOwnProperty(options.nameCache, 'vars') && isObject(options.nameCache.vars)) {
+            vars = merge({}, options.nameCache.vars || {}, vars);
+          }
+
+          if (hasOwnProperty(nameCache, 'vars') && isObject(nameCache.vars)) {
+            vars = merge({}, nameCache.vars, vars);
+          }
+
+          // eslint-disable-next-line no-param-reassign
+          options.nameCache.vars = vars;
+
+          let props: Record<string, any> = {};
+
+          if (hasOwnProperty(options.nameCache, 'props') && isObject(options.nameCache.props)) {
+            // eslint-disable-next-line prefer-destructuring
+            props = options.nameCache.props;
+          }
+
+          if (hasOwnProperty(nameCache, 'props') && isObject(nameCache.props)) {
+            props = merge({}, nameCache.props, props);
+          }
+
+          // eslint-disable-next-line no-param-reassign
+          options.nameCache.props = props;
+        }
+
+        if ((!!defaultOptions.sourceMap || !!options.sourceMap) && 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;
+    }
+  };
+}

Frontend-Learner/node_modules/@rollup/plugin-terser/src/type.ts

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+import type { AsyncResource } from 'async_hooks';
+import type { Worker } from 'worker_threads';
+
+import type { MinifyOptions } from 'terser';
+
+import type { taskInfo } from './constants';
+
+export interface Options extends MinifyOptions {
+  nameCache?: Record<string, any>;
+  maxWorkers?: number;
+}
+
+export interface WorkerContext {
+  code: string;
+  options: Options;
+}
+
+export type WorkerCallback = (err: Error | null, output?: WorkerOutput) => void;
+
+interface WorkerPoolTaskInfo extends AsyncResource {
+  done(err: Error | null, result: any): void;
+}
+
+export type WorkerWithTaskInfo = Worker & { [taskInfo]?: WorkerPoolTaskInfo | null };
+
+export interface WorkerContextSerialized {
+  code: string;
+  options: string;
+}
+
+export interface WorkerOutput {
+  code: string;
+  nameCache?: Options['nameCache'];
+  sourceMap?: Record<string, any>;
+}
+
+export interface WorkerPoolOptions {
+  filePath: string;
+  maxWorkers?: number;
+}
+
+export interface WorkerPoolTask {
+  context: WorkerContext;
+  cb: WorkerCallback;
+}

Frontend-Learner/node_modules/@rollup/plugin-terser/src/worker-pool.ts

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+import { AsyncResource } from 'async_hooks';
+import { Worker } from 'worker_threads';
+import { cpus } from 'os';
+import { EventEmitter } from 'events';
+
+import serializeJavascript from 'serialize-javascript';
+
+import { freeWorker, taskInfo, workerPoolWorkerFlag } from './constants';
+
+import type {
+  WorkerCallback,
+  WorkerContext,
+  WorkerOutput,
+  WorkerPoolOptions,
+  WorkerPoolTask,
+  WorkerWithTaskInfo
+} from './type';
+
+class WorkerPoolTaskInfo extends AsyncResource {
+  constructor(private callback: WorkerCallback) {
+    super('WorkerPoolTaskInfo');
+  }
+
+  done(err: Error | null, result: any) {
+    this.runInAsyncScope(this.callback, null, err, result);
+    this.emitDestroy();
+  }
+}
+
+export class WorkerPool extends EventEmitter {
+  protected maxInstances: number;
+
+  protected filePath: string;
+
+  protected tasks: WorkerPoolTask[] = [];
+
+  protected workers: WorkerWithTaskInfo[] = [];
+  protected freeWorkers: WorkerWithTaskInfo[] = [];
+
+  constructor(options: WorkerPoolOptions) {
+    super();
+
+    this.maxInstances = options.maxWorkers || 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(): number {
+    return this.workers.length;
+  }
+
+  addAsync(context: WorkerContext): Promise<WorkerOutput> {
+    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();
+    }
+  }
+
+  private addNewWorker() {
+    const worker: WorkerWithTaskInfo = new Worker(this.filePath, {
+      workerData: workerPoolWorkerFlag
+    });
+
+    worker.on('message', (result) => {
+      worker[taskInfo]?.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);
+  }
+
+  private runTask(context: WorkerContext, cb: WorkerCallback) {
+    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)
+      });
+    }
+  }
+}

Frontend-Learner/node_modules/@rollup/plugin-terser/src/worker.ts

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+import { isMainThread, parentPort, workerData } from 'worker_threads';
+
+import { hasOwnProperty, isObject } from 'smob';
+
+import { minify } from 'terser';
+
+import { workerPoolWorkerFlag } from './constants';
+
+import type { WorkerContextSerialized, WorkerOutput } from './type';
+
+/**
+ * Duck typing worker context.
+ *
+ * @param input
+ */
+function isWorkerContextSerialized(input: unknown): input is WorkerContextSerialized {
+  return (
+    isObject(input) &&
+    hasOwnProperty(input, 'code') &&
+    typeof input.code === 'string' &&
+    hasOwnProperty(input, 'options') &&
+    typeof input.options === 'string'
+  );
+}
+
+export function runWorker() {
+  if (isMainThread || !parentPort || workerData !== workerPoolWorkerFlag) {
+    return;
+  }
+
+  // eslint-disable-next-line no-eval
+  const eval2 = eval;
+
+  parentPort.on('message', async (data: WorkerContextSerialized) => {
+    if (!isWorkerContextSerialized(data)) {
+      return;
+    }
+
+    const options = eval2(`(${data.options})`);
+
+    const result = await minify(data.code, options);
+
+    const output: WorkerOutput = {
+      code: result.code || data.code,
+      nameCache: options.nameCache
+    };
+
+    if (typeof result.map === 'string') {
+      output.sourceMap = JSON.parse(result.map);
+    }
+
+    if (isObject(result.map)) {
+      output.sourceMap = result.map;
+    }
+
+    parentPort?.postMessage(output);
+  });
+}