Type 'void' is not assignable to type '((event: MouseEvent) => void) | undefined'

Question

   import * as React from \"react\";
   import \"./App.css\";
   import PageTwo from \"./components/PageTwo\";

    export interface IPropsk {
        data?: Array&l         


        

Answer 1

You can just set type this way and you will get no errors

export interface IPropsk {
    data?: Array;
    fetchData?(): (value: string) => void;
}