How to define type for a function callback (as any function type, not universal any) used in a method parameter

Question

Currently I have type definition as:

interface Param {     title: string;     callback: any; } 

I need something like:

interface Param {     title: string;     callback: function; } 

but the 2nd one is not being accepted.

Answer 1

The global type Function serves this purpose.

Additionally, if you intend to invoke this callback with 0 arguments and will ignore its return value, the type () => void matches all functions taking no arguments.