Reproduction link or steps

1. Open https://stackblitz.com/edit/github-6jajke-stx58g?file=rolldown.config.mjs
2. npm run build runs automatically.
3. The output contains experimental decorators as-is.

What is expected?

Either

• Throw an error that says "experimental decorators are not supported yet"
• Read the tsconfig and transform experimental decorators to valid JS if enabled

What is actually happening?

Experimental decorators are passes as-is even if it's not a valid JS.

System Info

Stackblitz

  System:
    OS: Linux 5.0 undefined
    CPU: (8) x64 Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
    Memory: 0 Bytes / 0 Bytes
    Shell: 1.0 - /bin/jsh
  Binaries:
    Node: 18.20.3 - /usr/local/bin/node
    Yarn: 1.22.19 - /usr/local/bin/yarn
    npm: 10.2.3 - /usr/local/bin/npm
    pnpm: 8.15.6 - /usr/local/bin/pnpm
  npmPackages:
    rolldown: https://pkg.pr.new/rolldown@351d2c7 => 0.13.2

Any additional comments?

Faced this while trying rolldown with Vite.