我试图运行我的测试文件时遇到了错误（我正在使用React TypeScript）。
● 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} ${classStyle ?? ''}`}>
> 7 | <ReactMarkdown>{text}</ReactMarkdown>
| ^
8 | </div>
9 | );
10 | export default Markdown;
at Runtime.createScriptFromCode (node_modules/jest-runtime/build/index.js:1728:14)
at Object.<anonymous> (components/media/markdown/index.tsx:7:45)
{
setupFilesAfterEnv: ['<rootDir>/jest.setup.js'],
moduleDirectories: ['node_modules', '<rootDir>/'],
testEnvironment: 'jest-environment-jsdom',
moduleNameMapper: {
'next/router': '<rootDir>/__mocks__/next/router.js',
'^.+\\.module\\.(css|sass|scss)$': '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": []
}
我刚开始使用Jest，不确定是否做错了什么
moduleNameMapper的目的基本上是为了测试而存根资源。但有时它也可以用来帮助 Jest 找到正确的模块来运行测试。在react-markdown的情况下，它只需要一点帮助来指向正确的目录以运行正确的文件进行测试。希望这可以帮到你。 - poweratom