Frontend rejects decorators with `SC0001: Decorators are not valid here.`

[Caleul]

Description

scriptc rejects decorator syntax with SC0001: Decorators are not valid here. instead of compiling it. This makes it impossible to build any codebase that relies on decorators — including NestJS apps, which use them pervasively for dependency injection, controllers, providers, and parameter injection.

In the case below, a standard NestJS constructor parameter decorator (@InjectPinoLogger from nestjs-pino) is rejected, even though it is valid TypeScript and compiles fine with tsc.

Minimal Demo

import { Injectable } from "@nestjs/common";
import { InjectPinoLogger, PinoLogger } from "nestjs-pino";

@Injectable()
export class FileValidationService {
  constructor(
    @InjectPinoLogger(FileValidationService.name)
    private readonly logger: PinoLogger,
  ) {}
}

Output

src/server/shared/modules/filesystem/file-validation.service.ts:31:5 - error SC0001: Decorators are not valid here.

  30 |   constructor(
  31 |     @InjectPinoLogger(FileValidationService.name)
     |     ^
  32 |     private readonly logger: PinoLogger,

Expected

Decorators should be supported (class, method, property, accessor, and parameter decorators), compiling to their equivalent runtime form and preserving metadata — matching TS experimentalDecorators + emitDecoratorMetadata semantics that frameworks like NestJS depend on.

If full decorator support is out of scope, the limitation should be clearly documented, since SC0001 currently blocks entire categories of TypeScript projects.

Environment

• @scriptc/compiler version: 0.0.35
• OS: MacOS

Notes

This same file compiles without errors under tsc with experimentalDecorators and emitDecoratorMetadata enabled.