Typescript type of function

onSubmit: () => void;
onSubmit: (value: string) => void;

Typescript annotate return type

function add(x: number, y: number): number {
  return x + y;
}

Types function typescript

interface Better_still_safe_but_way_more_flexible_fix {
    title: string;
    callback: <T = unknown, R = unknown>(args?: T) => R;
}
interface Alternate_Syntax_4_Better_still_safe_but_way_more_flexible_fix {
    title: string;
    callback<T = unknown, R = unknown>(args?: T): R;
}

-1

Source: stackoverflow.com

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