nest cannot handle src/main.mts

[beckend]

Is there an existing issue for this?

• I have searched the existing issues

Current behavior

> nest start

Error: Cannot find module '/home/admin/Coding/codegenerator/dist/main'
    at Function.Module._resolveFilename (node:internal/modules/cjs/loader:1039:15)
    at Function.Module._load (node:internal/modules/cjs/loader:885:27)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:81:12)

works fine when using main.ts.

Minimum reproduction code

https://github.com/beckend/bug-nestjs-main.mts

Steps to reproduce

mkdir /tmp/work && cd /tmp/work
npm i -g @nestjs/cli
npx nest new project-name
cd project-name
mv src/main.ts src/main.mts
npm run start

nest start

Error: Cannot find module '/tmp/work/project-name/dist/main'
    at Function.Module._resolveFilename (node:internal/modules/cjs/loader:1039:15)
    at Function.Module._load (node:internal/modules/cjs/loader:885:27)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:81:12)
    at node:internal/main/run_main_module:23:47

Expected behavior

> project-name@0.0.1 start
> nest start

[Nest] 58877  - 02/02/2023, 11:45:40 PM     LOG [NestFactory] Starting Nest application...
[Nest] 58877  - 02/02/2023, 11:45:40 PM     LOG [InstanceLoader] AppModule dependencies initialized +5ms
[Nest] 58877  - 02/02/2023, 11:45:40 PM     LOG [RoutesResolver] AppController {/}: +2ms
[Nest] 58877  - 02/02/2023, 11:45:40 PM     LOG [RouterExplorer] Mapped {/, GET} route +1ms
[Nest] 58877  - 02/02/2023, 11:45:40 PM     LOG [NestApplication] Nest application successfully started +0ms

Package

• I don't know. Or some 3rd-party package
• @nestjs/common
• @nestjs/core
• @nestjs/microservices
• @nestjs/platform-express
• @nestjs/platform-fastify
• @nestjs/platform-socket.io
• @nestjs/platform-ws
• @nestjs/testing
• @nestjs/websockets
• Other (see below)

Other package

No response

NestJS version

9.3.1

Packages versions

"dependencies": {
    "@nestjs/common": "^9.3.1",
    "@nestjs/core": "^9.3.1",
    "@nestjs/platform-express": "^9.3.1",
    "reflect-metadata": "^0.1.13",
    "rxjs": "^7.8.0"
  },
  "devDependencies": {
    "@nestjs/cli": "^9.1.9",
    "@nestjs/schematics": "^9.0.4",
    "@nestjs/testing": "^9.3.1",
    "@types/express": "^4.17.16",
    "@types/jest": "29.4.0",
    "@types/node": "18.11.18",
    "@types/supertest": "^2.0.12",
    "@typescript-eslint/eslint-plugin": "^5.50.0",
    "@typescript-eslint/parser": "^5.50.0",
    "eslint": "^8.33.0",
    "eslint-config-prettier": "^8.6.0",
    "eslint-plugin-prettier": "^4.2.1",
    "jest": "29.4.1",
    "prettier": "^2.8.3",
    "source-map-support": "^0.5.21",
    "supertest": "^6.3.3",
    "ts-jest": "29.0.5",
    "ts-loader": "^9.4.2",
    "ts-node": "^10.9.1",
    "tsconfig-paths": "4.1.2",
    "typescript": "^4.9.5"
  },

Node.js version

18.13.0

In which operating systems have you tested?

• macOS
• Windows
• Linux

Other

No response

[beckend]

why would I build it?

[micalevisk]

yeeah, using nest start you don't have to build it yourself. I thought you were using npm run start:prod my bad

[micalevisk]

you can circumvent that by using the entryFile option in your nest-cli.json with the value "main.mjs" so it will run node dist/src/main.mjs instead

But it still won't start due to the lack of support of ESM (see #8736)

[kamilmysliwiec]

#8736