Property 'start' in type 'MainMenu' is not assignable to the same property in base type 'ReactUiBase'.

[sorskoot]

Overriding the start function causes a TypeScript error saying that the return types are different.

Property 'start' in type 'MainMenu' is not assignable to the same property in base type 'ReactUiBase'.
  Type '() => void' is not assignable to type '() => Promise<void>'.
    Type 'void' is not assignable to type 'Promise<void>'.ts(2416)

[sorskoot]

Ah... It has to be defined as
async start() {}

This is a bit confusing since a normal component doesn't need this.

[Squareys]

We could remove async from the parent and use Promise APIs instead. It seems like children can change to async, but once it's changed by a parent, it needs to be async all the way down 🤔