I'm new to TypeScript and a bit confused about the call signature concept. In the code snippet below, there's an interface named Counter that is supposed to represent a function type with additional properties like interval and reset. However, I'm having trouble understanding the line:
let counter = function (start: number) {} as Counter;interface Counter {
(start: number): string;
interval: number;
reset(): void;
}
function getCounter(): Counter {
let counter = function (start: number) {} as Counter;
counter.interval = 123;
counter.reset = function () {};
return counter;
}
let c = getCounter();
c(10);
c.reset();
c.interval = 5.0;