jest/react testing library issue with importing module (typescript)-CodePudding

I have the following error that cannot be solved even after changing my jest.config.js file. The error says:

 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/@my-cool-package/fcm/dist/esm/index.js:1
    ({"Object.<anonymous>":function(module,exports,require,__dirname,__filename,global,jest){import { registerPlugin } from "@capacitor/core";
                                                                                             ^^^^^^

    SyntaxError: Cannot use import statement outside a module

      1 | /* eslint-disable @typescript-eslint/no-unsafe-call */
      2 | /* eslint-disable @typescript-eslint/no-unsafe-member-access */
    > 3 | import { FCM } from '@my-cool-package/fcm'
        | ^
      4 | import { App } from '@capacitor/app'

      at Runtime.createScriptFromCode (node_modules/jest-runtime/build/index.js:1350:14)
      at Object.<anonymous> (src/core/services/PushNotificationService.ts:3:1)

And here's my jest.config.js file:

module.exports = {
  roots: ['./src'],
  transform: {
    '^. \\.(ts|js)x?$': 'ts-jest',
  },
  testPathIgnorePatterns: [
    '/node_modules/(?!@my-cool-package/)',
    '/src/context/__mocks__',
  ],
  testRegex: '(/test/.*|\\.(test|spec))\\.(ts|tsx|js)$',
  modulePaths: ['<rootDir>'],
  moduleFileExtensions: ['ts', 'tsx', 'js', 'json'],
  moduleNameMapper: {
    '^me/(.*)': '<rootDir>/src/me/$1',
    '\\.(jpg|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga)$':
      '<rootDir>/assetsTransformer.js',
    '\\.(css|less)$': 'identity-obj-proxy',
    '^@src(.*)$': '<rootDir>/src$1',
  },
}

Any suggestion for how to fix this?

CodePudding user response：

The issue is here If you are trying to use ECMAScript Modules.... To avoid this problem you can transform the content to a version of JS jest friendly by doing:

{...}
transformIgnorePatterns: [
    'node_modules/(?!(@my-cool-package)/)',
  ],
{...}

This way you are telling jest to transform also these library files before testing.