Bug Report: Invalid Type Error for Route Handler's Second Argument in Next.js 15

[shellen]

Expected Behavior

Build should succeed as the type pattern follows Next.js documentation.

Environment

• Next.js version: 15.1.0
• TypeScript version: [5]
• Node.js version: [18.18.0]
• Operating System: [macOS]

Additional Context

• This issue appeared after upgrading to Next.js 15

• Multiple type patterns have been tried:

  • { params: { id: string } }
  • RouteContext interface
  • Direct inline types
  • Type assertions

  See Readme for more trial/error.