Unable to run tests with NodeNext

[falk-stefan]

I want to run some unit-tests for my expressjs application.

However, I am not able to run any tests because jest is not able to run because it does not seem to pick up my tsconfig. I'm not 100% sure about that but it looks like that's the case. Using NodeNext requires relative imports to come with a suffix .js for example:

import { app } from '../../main.js';

but this will throw:

  ● Test suite failed to run

    Cannot find module '../../main.js' from 'src/controller/guide/tour.controller.spec.ts'

      2 |
      3 | import { CreateTour } from '../../dto/TourDto.js';
    > 4 | import { app } from '../../main.js';

How can I fix this issue?

jest.config.ts

import type { Config } from '@jest/types';

const config: Config.InitialOptions = {
  transform: {
    '^.+\\.tsx?$': 'ts-jest',
  },
};

export default config;

tsconfig.json

{
  "compilerOptions": {
    "target": "es2022",
    "module": "NodeNext",
    "moduleResolution": "NodeNext",
    "rootDir": "./src",
    "sourceMap": true,
    "outDir": "./dist",
    "esModuleInterop": true,
    "forceConsistentCasingInFileNames": true,
    "strict": true,
    "noImplicitAny": false,
    "skipLibCheck": true,
    "allowJs": true,
    "checkJs": false,
    "experimentalDecorators": true
  },
  "include": [
    "src/**/*.ts",
    "src/**/*.js"
  ],
  "exclude": [
    "node_modules"
  ]
}

[ahnpnl]

The example app is using Node16 https://github.com/kulshekhar/ts-jest/tree/main/examples/js-with-ts, probably a bit similar to NodeNext too. You can give it a try