PR Review: Remove explicit dependency on jest-circus & modify docblock

Author: ankurkaushal

Diff for: packages/react-error-overlay/src/__tests__/get-source-map.js

@@ -1,12 +1,10 @@
-/**
- * @jest-environment jsdom
- */
-
 /**
  * Copyright (c) 2015-present, Facebook, Inc.
  *
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
+ *
+ * @jest-environment jsdom
  */
 
 import { getSourceMap } from '../utils/getSourceMap';

Diff for: packages/react-scripts/package.json

@@ -59,7 +59,6 @@
     "html-webpack-plugin": "4.5.0",
     "identity-obj-proxy": "3.0.0",
     "jest": "27.0.0-next.6",
-    "jest-circus": "27.0.0-next.6",
     "jest-resolve": "27.0.0-next.6",
     "jest-watch-typeahead": "0.6.1",
     "mini-css-extract-plugin": "0.11.3",

Diff for: packages/react-scripts/scripts/utils/createJestConfig.js

@@ -39,7 +39,6 @@ module.exports = (resolve, rootDir, isEjecting) => {
       '<rootDir>/src/**/*.{spec,test}.{js,jsx,ts,tsx}',
     ],
     testEnvironment: 'jsdom',
-    testRunner: require.resolve('jest-circus/runner'),
     transform: {
       '^.+\\.(js|jsx|mjs|cjs|ts|tsx)$': resolve(
         'config/jest/babelTransform.js'