Fix.

node_modules/@jest/test-sequencer/build/index.d.ts

@@ -0,0 +1,52 @@
+/**
+ * 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.
+ */
+import { AggregatedResult } from '@jest/test-result';
+import { Context } from 'jest-runtime';
+import { Test } from 'jest-runner';
+declare type Cache = {
+    [key: string]: [0 | 1, number];
+};
+/**
+ * The TestSequencer will ultimately decide which tests should run first.
+ * It is responsible for storing and reading from a local cache
+ * map that stores context information for a given test, such as how long it
+ * took to run during the last run and if it has failed or not.
+ * Such information is used on:
+ * TestSequencer.sort(tests: Array<Test>)
+ * to sort the order of the provided tests.
+ *
+ * After the results are collected,
+ * TestSequencer.cacheResults(tests: Array<Test>, results: AggregatedResult)
+ * is called to store/update this information on the cache map.
+ */
+export default class TestSequencer {
+    private _cache;
+    _getCachePath(context: Context): string;
+    _getCache(test: Test): Cache;
+    /**
+     * Sorting tests is very important because it has a great impact on the
+     * user-perceived responsiveness and speed of the test run.
+     *
+     * If such information is on cache, tests are sorted based on:
+     * -> Has it failed during the last run ?
+     * Since it's important to provide the most expected feedback as quickly
+     * as possible.
+     * -> How long it took to run ?
+     * Because running long tests first is an effort to minimize worker idle
+     * time at the end of a long test run.
+     * And if that information is not available they are sorted based on file size
+     * since big test files usually take longer to complete.
+     *
+     * Note that a possible improvement would be to analyse other information
+     * from the file other than its size.
+     *
+     */
+    sort(tests: Array<Test>): Array<Test>;
+    cacheResults(tests: Array<Test>, results: AggregatedResult): void;
+}
+export {};
+//# sourceMappingURL=index.d.ts.map