Turbo loader item options type too strict

Link to the code that reproduces this issue

https://github.com/Netail/repro-next-typescript-next-config

To Reproduce

1. Install dependencies; yarn install
2. Inspect next.config.ts
3. Svgr options clash with turbo options type

Current vs. Expected behavior

The turbo loader options type are a bit too strict compared to what's allowed by e.g. the SVGR plugin options

Provide environment information

Operating System:
  Platform: darwin
  Arch: arm64
  Version: Darwin Kernel Version 24.1.0: Thu Oct 10 21:03:15 PDT 2024; root:xnu-11215.41.3~2/RELEASE_ARM64_T6000
  Available memory (MB): 32768
  Available CPU cores: 10
Binaries:
  Node: 22.11.0
  npm: 10.9.0
  Yarn: 1.22.22
  pnpm: 9.6.0
Relevant Packages:
  next: 15.1.3 // Latest available version is detected (15.1.3).
  eslint-config-next: N/A
  react: 19.0.0
  react-dom: 19.0.0
  typescript: 5.7.2
Next.js Config:
  output: N/A

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

TypeScript

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

next dev (local)

Additional context

No response

Run yarn install in the linked reproduction and inspect next.config.ts to isolate the clash between SVGR options and the turbo loader options type. Trace the corresponding Next.js TypeScript definitions, then verify that the reproduction config type-checks while retaining the supported turbo options.