Link to the code that reproduces this issue

https://github.com/hamidrezahanafi/turbopack-legacy-decorators

To Reproduce

1. start the app in development mode with turbo option (next dev --turbopack)
2. notice the error Error: An element descriptor's .kind property must be either "method" or "field", but a decorator created an element descriptor with .kind "undefined"
3. move "experimentalDecorators": true from tsconfig-base.json to tsconfig.json
4. error goes away

Current vs. Expected behavior

Current: experimentalDecorators is not resolved from an extended tsconfig json file, also this is not happening without --turbo

expected: experimentalDecorators can be resolved from any extended tsconfig file

Provide environment information

Operating System:
  Platform: darwin
  Arch: arm64
  Version: Darwin Kernel Version 24.4.0: Fri Apr 11 18:32:50 PDT 2025; root:xnu-11417.101.15~117/RELEASE_ARM64_T6041
  Available memory (MB): 49152
  Available CPU cores: 14
Binaries:
  Node: 22.14.0
  npm: 10.9.2
  Yarn: 1.22.22
  pnpm: N/A
Relevant Packages:
  next: 15.3.1 // No Next.js version data was found.
  eslint-config-next: N/A
  react: 19.1.0
  react-dom: 19.1.0
  typescript: 5.8.3
Next.js Config:
  output: N/A

Which area(s) are affected? (Select all that apply)

Turbopack

Which stage(s) are affected? (Select all that apply)

next dev (local)

Additional context

No response