Jest遇到了一个意想不到的标记+反应标记

Question

我在尝试运行测试文件时出错(我使用的是)

  ● Test suite failed to run

    Jest encountered an unexpected token

    Jest failed to parse a file. This happens e.g. when your code or its dependencies use non-standard JavaScript syntax, or when Jest is not configured to support such syntax.

    Out of the box Jest supports Babel, which will be used to transform your files into valid JS based on your Babel configuration.

    By default "node_modules" folder is ignored by transformers.

    Here's what you can do:
     • If you are trying to use ECMAScript Modules, see https://jestjs.io/docs/ecmascript-modules for how to enable it.
     • If you are trying to use TypeScript, see https://jestjs.io/docs/getting-started#using-typescript
     • 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/configuration
    For information about custom transformations, see:
    https://jestjs.io/docs/code-transformation

    Details:

    export {uriTransformer} from './lib/uri-transformer.js'
    ^^^^^^

    SyntaxError: Unexpected token 'export'

       5 | const Markdown = ({ text, classStyle }: ITextMedia) => (
       6 |   <div className={`${classes.mediaParagraph} ${classStyle ?? ''}`}>
    >  7 |     <ReactMarkdown>{text}</ReactMarkdown>
         |                                             ^
       8 |   </div>
       9 | );
      10 | export default Markdown;

      at Runtime.createScriptFromCode (node_modules/jest-runtime/build/index.js:1728:14)
      at Object.<anonymous> (components/media/markdown/index.tsx:7:45)

我已经尝试过将React标记添加到转换忽略模式，但它仍然不起作用。

这是我的jest.config

{
  setupFilesAfterEnv: ['<rootDir>/jest.setup.js'],
  moduleDirectories: ['node_modules', '<rootDir>/'],
  testEnvironment: 'jest-environment-jsdom',
  moduleNameMapper: {
    'next/router': '<rootDir>/__mocks__/next/router.js',
    '^.+\\.module\\.(css|sass|scss)$': 'identity-obj-proxy',
    '^.+\\.(jpg|jpeg|png|gif|webp|avif|svg)$': '<rootDir>/__mocks__/file-mock.js',
  },
  transform: {
    '^.+\\.(js|jsx)$': 'babel-jest'
  },
  transformIgnorePatterns: [
    'node_modules/(?!react-markdown/)'
  ]
}

我的babel配置：

{
    "presets": [
        "next/babel",
        "@babel/preset-env"
    ],
    "plugins": []
}

我刚开始开玩笑，所以我不确定我是不是做错了什么

Answer 1

在jest.config文件中，需要向moduleNameMapper属性添加以下内容：

"react-markdown": "<rootDir>/node_modules/react-markdown/react-markdown.min.js"

因此，实际上，您的moduleNameMapper应该如下所示：

  ...
  moduleNameMapper: {
    'next/router': '<rootDir>/__mocks__/next/router.js',
    '^.+\\.module\\.(css|sass|scss)$': 'identity-obj-proxy',
    '^.+\\.(jpg|jpeg|png|gif|webp|avif|svg)$': '<rootDir>/__mocks__/file-mock.js',
    'react-markdown': '<rootDir>/node_modules/react-markdown/react-markdown.min.js',
  },
  ...

祝好运!