import { greeter } from "super-greeter";
// Normal Greeter API
greeter(2);
greeter("Hello world");
// Now we extend the object with a new function at runtime
import "hyper-super-greeter";
greeter.hyperGreet();

The definition for “super-greeter”:

/*~ This example shows how to have multiple overloads for your function */
export interface GreeterFunction {
  (name: string): void
  (time: number): void
}
/*~ This example shows how to export a function specified by an interface */
export const greeter: GreeterFunction;