Can't configure turbopack in next.config.ts file

[FarzadMohtasham]

Link to the code that reproduces this issue

https://codesandbox.io/p/devbox/exciting-matsumoto-go8s7s

To Reproduce

1. install @svgr/webpack leader
2. add turbopack config to next.config.ts file

`
import type { NextConfig } from "next";

const nextConfig: NextConfig = {
turbo: {
rules: {
".svg": {
loaders: ["@svgr/webpack"],
as: ".js",
},
},
},
};

export default nextConfig;
`

4. run next project using next dev --turbo
5. error:

`
yarn run v1.22.22
$ next dev --turbo
▲ Next.js 15.0.2-canary.6 (Turbopack)

• Local: http://localhost:3000

✓ Starting...
⚠ Invalid next.config.ts options detected:
⚠ Unrecognized key(s) in object: 'turbo'
⚠ See more info here: https://nextjs.org/docs/messages/invalid-next-config
✓ Ready in 3.3s
`

Current vs. Expected behavior

In api-reference/next-config-js/turbo i used this config in my next.config.ts file:
module.exports = { turbo: { rules: { '*.svg': { loaders: ['@svgr/webpack'], as: '*.js', }, }, }, }
But i recived errors that are mentioned in above field

Provide environment information

Operating System:
  Platform: win32
  Arch: x64
  Version: Windows 11 Pro
  Available memory (MB): 24408
  Available CPU cores: 16
Binaries:
  Node: 22.10.0
  npm: N/A
  Yarn: N/A
  pnpm: N/A
Relevant Packages:
  next: 15.0.2-canary.6 // There is a newer canary version (15.0.2-canary.7) available, please upgrade! 
  eslint-config-next: 15.0.0-rc.1
  react: 19.0.0-rc-1631855f-20241023
  react-dom: 19.0.0-rc-1631855f-20241023
  typescript: 5.6.3
Next.js Config:
  output: {
  turbo: {
    rules: {
      "*.svg": {
        loaders: ["@svgr/webpack"],
        as: "*.js",
      },
    },
  },
}

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

Turbopack

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

next dev (local), next build (local), next start (local)

Additional context

No response

[mfaux]

In the meantime, you can use turbo under experimental:

const nextConfig: NextConfig = {
  experimental: {
    turbo: {
      rules: {
        /* your rules here*
      },
    },
  },
};

[FarzadMohtasham]

Thanks, the problem is fixed. Is this due to using Next 15.0.2-canary.6? In the stable version of Next, we can configure Turbopack outside of the experimental, correct?

[dualdetail]

The docs are just wrong, I ran into the same thing. They just didn't update the type def to match the documentation update. In the docs turbo was no longer experimental since V15.0.0