测试套装因“SyntaxError: Unexpected token 'export”' react typescript using jest 失败

Posted 2023-02-22

【中文标题】测试套装因“SyntaxError: Unexpected token \'export”\' react typescript using jest 失败

【英文标题】：Test suits failed with "SyntaxError: Unexpected token 'export" ' react typescript using jest测试套装因“SyntaxError: Unexpected token 'export”' react typescript using jest 失败

【发布时间】：2020-12-28 19:29:20

【问题描述】：

我在我的 react-typescript 项目中设置了 jest 和酶。在这个项目中，我没有使用 babel。

我尝试运行基本组件并且它运行良好。

之后我添加了另一个组件，并在这个组件中添加了我们自定义的基于 react-typescript 的库（cc-react-common-lib）。

当我包含 cc-react-common-lib 时，jest 会抛出以下错误

SyntaxError: Unexpected token 'export'

 Jest encountered an unexpected token

    This usually means that you are trying to import a file which Jest cannot parse, e.g. it's not plain javascript.

    By default, if Jest sees a Babel config, it will use that to transform your files, ignoring "node_modules".

    Here's what you can do:
     • To have some of your "node_modules" files transformed, you can specify a custom "transformIgnorePatterns" in your config.
     • If you need a custom transformation specify a "transform" option in your config.
     • If you simply want to mock your non-JS modules (e.g. binary assets) you can stub them out with the "moduleNameMapper" config option.

    You'll find more details and examples of these config options in the docs:
    https://jestjs.io/docs/en/configuration.html

    Details:

    /home/convertcart/projects/intelli-blocks/node_modules/cc-react-common-lib/lib/index.js:1
    export  default as TableSpaced  from './general/table-spaced';
    ^^^^^^

    SyntaxError: Unexpected token 'export'

      1 | /* eslint-disable jsx-a11y/control-has-associated-label */
      2 | import React,  useState, useEffect  from 'react';
    > 3 | import 
        | ^
      4 |   TextField,
      5 |   useAjaxForm,
      6 |   Spacer,

我在过去 1 周尝试解决此错误，但找不到任何解决方案

jest.config.js：

module.exports = 
  // The root of your source code, typically /src
  // `<rootDir>` is a token Jest substitutes
  roots: ['<rootDir>'],

  // Jest transformations -- this adds support for TypeScript
  // using ts-jest
  // transform: 
  //   "^.+\\.tsx?$": "ts-jest"
  // ,
  preset: 'ts-jest',
  // maxConcurrency:30,
  // Runs special logic, such as cleaning up components
  // when using React Testing Library and adds special
  // extended assertions to Jest
  // setupFilesAfterEnv: [
  //   "@testing-library/react/cleanup-after-each",
  //   "@testing-library/jest-dom/extend-expect"
  // ],

  // Test spec file resolution pattern
  // Matches parent folder `__tests__` and filename
  // should contain `test` or `spec`.
  testRegex: '(/__tests__/.*|(\\.|/)(test|spec))\\.tsx?$',

  // Module file extensions for importing
  moduleFileExtensions: ['ts', 'tsx', 'js', 'jsx', 'json', 'node'],
  snapshotSerializers: ['enzyme-to-json/serializer'],
  setupFilesAfterEnv: ['<rootDir>/setupEnzyme.ts'],
;

setupEnzyme.js：

/* eslint-disable import/no-extraneous-dependencies */
import Enzyme from 'enzyme';
import ReactSixteenAdapter from 'enzyme-adapter-react-16';
Enzyme.configure( adapter: new ReactSixteenAdapter() );

更新：当我在 jest.confi.js 文件中添加以下行时

transform: 
    '^.+\\.tsx?$': 'babel-jest',
  ,

以下错误消息来了：

● Test suite failed to run

    SyntaxError: /home/convertcart/projects/intelli-blocks/client/__tests__/editblock.test.tsx: Support for the experimental syntax 'jsx' isn't currently enabled (8:29):

       6 | console.log("Edit block test");
       7 | it('Renders and Simulates Click Event ', () => 
    >  8 |     const Wrapper = shallow(<EditBlock />);
         |                             ^
       9 |     const checkbox = () => Wrapper.find( type: 'checkbox' );
      10 |     expect(checkbox().props().checked).toBe(false);
      11 |     checkbox().simulate('change',  target:  checked: true  );

    Add @babel/preset-react (https://git.io/JfeDR) to the 'presets' section of your Babel config to enable transformation.
    If you want to leave it as-is, add @babel/plugin-syntax-jsx (https://git.io/vb4yA) to the 'plugins' section to enable parsing.

      at Parser._raise (../node_modules/@babel/parser/src/parser/error.js:60:45)
      at Parser.raiseWithData 

【问题讨论】：

Jest 25 应该有原生 ESM 支持 ***.com/a/61652773/2312051

这能回答你的问题吗？ Does Jest support ES6 import/export?

@DenisTsoi 感谢您的评论。这个答案没有帮助。我更新了我的问题，请检查

【参考方案1】：

如果您通过代码编辑器插件运行测试，请尝试在编辑器中配置插件测试命令，以确保插件执行正确的命令。

例如我正在使用 vscode、jestrunner 插件和纱线包管理器。所以我在我的工作区 settings.json 文件中包含了以下行：

    "jestrunner.jestCommand": "yarn react-scripts test"

同样的错误得到了解决。希望它对你有用:)