What's the difference between “declare class” and “interface” in TypeScript

Question

In TypeScript, when creating .d.ts source declaration files, which is preferable and why?

declare class Example {
    public Method(): void; 
}

Answer 1

You can implement the interface:

class MyClass implements Example {
    Method() {

    }
}

Whereas the declare class syntax is really intended to be used to add type definitions for external code that isn't written in TypeScript - so the implementation is "elsewhere".