相关疑难解决方法(0)

我正在尝试对现有的 React Native 项目进行测试。当我使用 Jest 运行测试时，测试会出现以下错误：

Test suite failed to run

   ...etc/__app__/node_modules/react-native/Libraries/polyfills/error-guard.js:14
    type ErrorHandler = (error: mixed, isFatal: boolean) => void;
         ^^^^^^^^^^^^

    SyntaxError: Unexpected identifier
      at ScriptTransformer._transformAndBuildScript (node_modules/@jest/transform/build/ScriptTransformer.js:537:17)
      at ScriptTransformer.transform (node_modules/@jest/transform/build/ScriptTransformer.js:579:25)
      at Object.<anonymous> (node_modules/react-native/jest/setup.js:16:6)

意外的标识符如下：

 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @format
 * @flow strict
 * @polyfill
 */

let _inGuard = …

我正在尝试使用 Jest 并仅测试渲染，这是我的测试文件：

import "react-native"; 
import React from "react"; 
import App from"../src/Root/"; 
import { create } from "react-test-renderer";

describe("App", () => {
 const tree = create(<App />).toJSON();  
 it("renders correctly", () => {
  expect(tree).toMatchSnapshot();
 }); 
});

当我运行时yarn test，出现错误

错误信息：

  /dic/node_modules/react-native/Libraries/polyfills/error-guard.js:14
    type ErrorHandler = (error: mixed, isFatal: boolean) => void;
         ^^^^^^^^^^^^

    SyntaxError: Unexpected identifier

      at Runtime.createScriptFromCode (node_modules/jest-runtime/build/index.js:1350:14)
      at Object.<anonymous> (node_modules/react-native/jest/setup.js:16:6)

Test Suites: 1 failed, 1 total
Tests:       0 total
Snapshots:   0 total
Time:        0.128 s

babel.config.js

module.exports = {
  presets: …