Nestjs Jest test failed cannot find module from app.e2e-spec.ts-CodePudding

I am still new in nestjs and i don't understand what happen when i try to make a simple test with jest in nestjs test folder, i already notice the absolute path is not working on the import, so i used relative path, the rest of the app work fine but in app.e2e-spec.ts i got the error when i simply import the app.module.

app.module.ts

import { AuthModule } from './auth/auth.module.js';
import { UserModule } from './user/user.module.js';
import { PrismaModule } from './prisma/prisma.module.js';

@Module({
  imports: [
    ConfigModule.forRoot({
      isGlobal: true
    }),
    AuthModule,
    UserModule,
    PrismaModule
  ],
})
export class AppModule {}

Simple test in app.e2e-spec.ts

import { Test } from '@nestjs/testing';
import { AppModule } from '../src/app.module.js'; //import relative path


describe('App end2end test', ()=> {
  beforeAll(async ()=> {
    const moduleRef = await Test.createTestingModule({
     imports: [ AppModule ]  // this line
    
    }).compile();
  })
  it.todo('should pass');
})

I check the path there is no mistake, for this project i am using Type: "Module" in package.json and "moduleResolution": "NodeNext", in tsconfig.json.

setting in jest-e2e.json

{
  "moduleFileExtensions": ["js", "json", "ts"],
  "rootDir": ".",
  "testEnvironment": "node",
  "testRegex": ".e2e-spec.ts$",
  "transform": {
    "^. \\.(t|j)s$": "ts-jest"
  }
}

ts.config.json

{
  "compilerOptions": {
    "module": "ES2022",
    "declaration": true,
    "removeComments": true,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "allowSyntheticDefaultImports": true,
    "target": "es2022",
    "sourceMap": true,
    "outDir": "./dist",
    "baseUrl": "./",
    "incremental": true,
    "skipLibCheck": true,
    "strictNullChecks": false,
    "noImplicitAny": false,
    "strictBindCallApply": false,
    "forceConsistentCasingInFileNames": false,
    "noFallthroughCasesInSwitch": false,
    "moduleResolution": "NodeNext",
    "esModuleInterop": true,
  },
}

When i run npm run test:e2e i get this error :

Cannot find module '../src/app.module.js' from 'app.e2e-spec.ts'

could it be the file extension with ts ? looks like the issue is the fact using "moduleResolution": "NodeNext" force me to add extension, while in the app when using "js" extention Typescript know it's a "ts" file, but this could be the issue on testing? what i am doing wrong or missing ?

CodePudding user response：

The path should refer to a .ts file. You're currently addressing to .js file.

Change ../src/app.module.js to ../src/app.module.

Updated:

Ok, seems like Jest getting confused by .js files whenever you import them in .ts files, and couldn't resolve paths.

To fix this, you need to have some changes in jest-e2e.json:

{
  "moduleFileExtensions": ["js", "json", "ts"],
  "rootDir": ".",
  "testEnvironment": "node",
  "testRegex": ".e2e-spec.ts$",
  "transform": {
    "^. \\.(t|j)s$": ["ts-jest", { "useESM": true }]
  },
  "moduleNameMapper": {
    "^(\\.*/.*)\\.(j|t)s$": "$1"
  },
  "extensionsToTreatAsEsm": [".ts"]
}