`return` without `function` syntax

[superdinmc]

~I am trying to load TypeScript types from /req.d.ts, without using websocket to run the linter. It's just a simple types that contain the following:~

class CSRequest extends Request {
  constructor() {
    super();
  }
  query: Record<string, string>
  params: Record<string, string>
}
declare var req: CSRequest;

~I fixed it the types, but it seems that ESLint is saying req is not defined.~ I fixed it

Moreover, I have a code that gets parsed using new Function(...)(I know it's unsafe but the editor is authenticated), the linter throws A "return" statement can only be used within a function. for the following code:

// Test code to echo all query parameters
return new Response(JSON.stringify(req.query), {
    headers: {
        'Content-Type': 'application/json'
    }
});