angular - Jest 遇到意外 token - 导入 (Angular CLI 6)

Question

在 Mac 上，我在安装 jest 并在 angular/cli (v6) 应用程序中工作时遇到问题。无论我使用什么方法来放置 Jest (如下所列)，我都会收到错误:

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:
     • 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/owner/Code/testjest/src/setup-jest.ts:1
    ({"Object.<anonymous>":function(module,exports,require,__dirname,__filename,global,jest){import 'jest-preset-angular';
                                                                                             ^^^^^^

    SyntaxError: Unexpected token import

      at ScriptTransformer._transformAndBuildScript (node_modules/jest-runtime/build/script_transformer.js:403:17)

我尝试过的方法包括:

• ng g @briebug/jest-schematic:add ( https://github.com/briebug/jest-schematic )
• https://brianflove.com/2018/05/26/angular-jest-testing/
• https://www.lambda-it.ch/blog/post/using-jest-with-angular
• https://blog.angularindepth.com/integrate-jest-into-an-angular-application-and-library-163b01d977ce

OTOH，当我克隆 https://github.com/blove/ngrx-testing/tree/master 时，该存储库运行 jest 得很好 - 我认为这排除了全局安装的 jest 包的问题

以下答案没有帮助:

• Jest encountered an unexpected token
• Jest - Unexpected token import

Answer 1

今天我发现了同样的错误消息，这就是我的解决方案。

• 通过 jest --clearCache 清除 Jest 缓存
• 在 tsconfig.spec.json 中添加 "module": "commonjs"

引用:https://github.com/thymikee/jest-preset-angular/issues/194