Minimal repro for TypeStrong/typedoc#1449

index.ts

export function fails<T extends [foo: any, bar?: any]>(a: T): T {
  return a;
}

package.json

{
  "name": "typedoc-tuple-error",
  "version": "1.0.0",
  "scripts": {
    "test": "typedoc index.ts"
  },
  "author": "Eemeli Aro <eemeli@gmail.com>",
  "license": "ISC",
  "devDependencies": {
    "typedoc": "^0.20.10",
    "typescript": "^4.1.3"
  }
}

tsconfig.json

{}

To reproduce:

1. Clone this gist
2. npm install
3. npm test