Add node modules and compiled JavaScript from main

node_modules/jest-worker/build/base/BaseWorkerPool.d.ts

@@ -0,0 +1,21 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+/// <reference types="node" />
+import { PoolExitResult, WorkerInterface, WorkerOptions, WorkerPoolOptions } from '../types';
+export default class BaseWorkerPool {
+    private readonly _stderr;
+    private readonly _stdout;
+    protected readonly _options: WorkerPoolOptions;
+    private readonly _workers;
+    constructor(workerPath: string, options: WorkerPoolOptions);
+    getStderr(): NodeJS.ReadableStream;
+    getStdout(): NodeJS.ReadableStream;
+    getWorkers(): Array<WorkerInterface>;
+    getWorkerById(workerId: number): WorkerInterface;
+    createWorker(_workerOptions: WorkerOptions): WorkerInterface;
+    end(): Promise<PoolExitResult>;
+}