Before create an issue I would like to understand if the next warning could be resolved here:

[Vue warn]: Missing required prop: "onClick" 
  at <HelloWorld> 
  at <App>

I have this interface with two ways of declaring a function:

export interface HelloWorldProps {
  msg?: string;
  onClick?(): void;
  onFocus?: () => void;
}

Only If I use an arrow function it works.

Example:
https://stackblitz.com/edit/vitejs-vite-bcwnrm?file=src/components/types.ts