How does prototype extend on typescript?

Question

i extended function prototype but typescript doesn\'t recognize it.

Function.prototype.proc = function() {
  var args, target, v;
  var __slice = [].slice;
          


        

Answer 1

I am adding this to advise against adding prototypes like the example shown in question since many people view this question. Add it as follows:

interface Function {
    proc(...args: any[]): any;
}

Object.defineProperty(Function.prototype, 'proc', { value: function(arg: any[]) {
    // Your function body
}});

The reason is if you add it to the prototype directly, it could get enumerated if an instance of that function get's enumerated over. for i in ... Now this block could be in a code you do not control (recently happened to me), so it is best to keep your code as safe as possible.