Fix.

node_modules/jest-worker/build/index.d.ts

@@ -0,0 +1,46 @@
+/**
+ * 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 { FarmOptions } from './types';
+/**
+ * The Jest farm (publicly called "Worker") is a class that allows you to queue
+ * methods across multiple child processes, in order to parallelize work. This
+ * is done by providing an absolute path to a module that will be loaded on each
+ * of the child processes, and bridged to the main process.
+ *
+ * Bridged methods are specified by using the "exposedMethods" property of the
+ * "options" object. This is an array of strings, where each of them corresponds
+ * to the exported name in the loaded module.
+ *
+ * You can also control the amount of workers by using the "numWorkers" property
+ * of the "options" object, and the settings passed to fork the process through
+ * the "forkOptions" property. The amount of workers defaults to the amount of
+ * CPUS minus one.
+ *
+ * Queueing calls can be done in two ways:
+ *   - Standard method: calls will be redirected to the first available worker,
+ *     so they will get executed as soon as they can.
+ *
+ *   - Sticky method: if a "computeWorkerKey" method is provided within the
+ *     config, the resulting string of this method will be used as a key.
+ *     Every time this key is returned, it is guaranteed that your job will be
+ *     processed by the same worker. This is specially useful if your workers
+ *     are caching results.
+ */
+export default class JestWorker {
+    private _ending;
+    private _farm;
+    private _options;
+    private _workerPool;
+    constructor(workerPath: string, options?: FarmOptions);
+    private _bindExposedWorkerMethods;
+    private _callFunctionWithArgs;
+    getStderr(): NodeJS.ReadableStream;
+    getStdout(): NodeJS.ReadableStream;
+    end(): void;
+}
+//# sourceMappingURL=index.d.ts.map