I have been making an app in Typescript with Express. Now I want to make unit tests (a bit late, I know) and found this problem:

1. To run the tests, imports inside of .ts files need not to have the file extension .js
2. To compile the code tested, imports inside of .ts files need to have the file extension .js

I’m pretty sure the is some config that I’m missing, but I would aprecciate if you told me.

jest.config.js

/** @type {import('ts-jest').JestConfigWithTsJest} */
// module.exports = {
//   preset: 'ts-jest',
//   testEnvironment: 'node',
// };

export default {
  preset:"ts-jest",
  testEnvironment:"node",
  testMatch: [
    '**/*.test.ts' // Solo ejecutar archivos .test.js
  ]
}

tsconfig.json

{
   "compilerOptions":{
    "target": "es2016", 
    "module": "Node16",
    "rootDir": "./src", 
    "sourceMap": true, 
    "outDir": "./dist",
    "removeComments": false,    
    "noEmitOnError": false, 
    "esModuleInterop": true, 
    "forceConsistentCasingInFileNames": true,  
    "strict": true, 
    "skipLibCheck": true 
    }
}

ps: formatting may be wrong in tsconfig.json because I wrote it by hand instead of copypasting

What I did:

1. Eliminating the .js extension inside .ts files
2. Changing the moduleResolution value to “bundle” given what I read here https://www.typescriptlang.org/tsconfig/#moduleResolution but the compiler said that moduleResolution couldn’t have that value