.

node_modules/jest-worker/build/WorkerPool.js

@@ -0,0 +1,49 @@
+'use strict';
+
+Object.defineProperty(exports, '__esModule', {
+  value: true
+});
+exports.default = void 0;
+
+var _BaseWorkerPool = _interopRequireDefault(require('./base/BaseWorkerPool'));
+
+function _interopRequireDefault(obj) {
+  return obj && obj.__esModule ? obj : {default: obj};
+}
+
+/**
+ * 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.
+ */
+const canUseWorkerThreads = () => {
+  try {
+    require('worker_threads');
+
+    return true;
+  } catch (_) {
+    return false;
+  }
+};
+
+class WorkerPool extends _BaseWorkerPool.default {
+  send(workerId, request, onStart, onEnd) {
+    this.getWorkerById(workerId).send(request, onStart, onEnd);
+  }
+
+  createWorker(workerOptions) {
+    let Worker;
+
+    if (this._options.enableWorkerThreads && canUseWorkerThreads()) {
+      Worker = require('./workers/NodeThreadsWorker').default;
+    } else {
+      Worker = require('./workers/ChildProcessWorker').default;
+    }
+
+    return new Worker(workerOptions);
+  }
+}
+
+var _default = WorkerPool;
+exports.default = _default;