TypeScript Allows You To Define Interfaces For Functions

[!INFO]-
topic: 🦒 TypeScript
links:

• Interfaces in TypeScript
• TypeScript uses a structural type system aka duck typing

source: TypeScript course by the native web
tags: #permanent-note #published

Last Modified: =dateformat(this.file.mtime, "MMM. dd, yyyy - HH:mm")

In TypeScript you can define interfaces for more than just objects. You can also define interfaces for functions. You can even add properties to those functions.

interface Add {
  (left: number, right: number): number;
  description: string;
}

const add: Add = function (left: number, right: number):  number {
  return left + right;
};

add.description = 'Calculates the sum of two numbers.';