使用 Jest 和 react-native-ble-plx 库进行 React Native 测试失败，因为“Jest 遇到了意外的令牌”

Question

试图执行那必须是一个简单的屏幕测试，我发现了这个错误。我看到一些涉及 babel 和 jest config 的相关问题和解决方案，但我没有找到解决它的正确方法。

  ● Test suite failed to run

    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:
     • If you are trying to use ECMAScript Modules, see https://jestjs.io/docs/en/ecmascript-modules for how to enable it.
     • 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:

    /Users/.../node_modules/react-native-ble-plx/index.js:3
    export { BleError, BleErrorCode, BleAndroidErrorCode, BleIOSErrorCode, BleATTErrorCode } from './src/BleError'
    ^^^^^^

    SyntaxError: Unexpected token 'export'

有什么建议吗？谢谢！

Answer 1

添加到jest.config.js终于解决了：

transformIgnorePatterns: [
    '<rootDir>/node_modules/(?!(jest-)?@?react-native|@react-native-community|@react-navigation)',
  ],

来源：github上的相关问题 https://github.com/callstack/react-native-testing-library/issues/703