Official TypeScript Decorators and --experimental-strip-types not working

[angelhdzdev]

Official TypeScript Decorators and --experimental-strip-types not working.

I get

/nest-no-param-dec/src/main.ts:28
  @Controller()
  ^

SyntaxError: Invalid or unexpected token
    at compileSourceTextModule (node:internal/modules/esm/utils:337:16)
    at ModuleLoader.moduleStrategy (node:internal/modules/esm/translators:166:18)
    at ModuleLoader.<anonymous> (node:internal/modules/esm/translators:540:10)
    at callTranslator (node:internal/modules/esm/loader:436:14)
    at ModuleLoader.moduleProvider (node:internal/modules/esm/loader:442:30)
    at async ModuleJob._link (node:internal/modules/esm/module_job:106:19)

Node.js v22.6.0
Failed running 'src/main.ts'

while using node --watch --experimental-strip-types src/main.ts and setting experimentalDecorators to false in tsconfig.json.

It works as expected using node --watch --loader ts-node/esm src/main.ts and setting experimentalDecorators to true in tsconfig.json.

Is this flag telling Node to use typescript 5.5.4 for the transpilation or not?

[angelhdzdev]

Update

Nevermind. It throws the same error when using node --watch --loader ts-node/esm src/main.ts and setting experimentalDecorators to false in tsconfig.json.

[RedYetiDev]

experimental type stripping does not currently support decorators.

CC @marco-ippolito

[marco-ippolito]

Technically strip-types support decorators in the sense that it doesnt strip them or throw. Our v8 version does not so it throws as invalid syntax