digitalMen/node_modules/core-js/modules/web.timers.js

var $ = require('../internals/export');
var global = require('../internals/global');
var apply = require('../internals/function-apply');
var isCallable = require('../internals/is-callable');
var userAgent = require('../internals/engine-user-agent');
var arraySlice = require('../internals/array-slice');
var validateArgumentsLength = require('../internals/validate-arguments-length');

var MSIE = /MSIE .\./.test(userAgent); // <- dirty ie9- check
var Function = global.Function;

var wrap = function (scheduler) {
  return function (handler, timeout /* , ...arguments */) {
    var boundArgs = validateArgumentsLength(arguments.length, 1) > 2;
    var fn = isCallable(handler) ? handler : Function(handler);
    var args = boundArgs ? arraySlice(arguments, 2) : undefined;
    return scheduler(boundArgs ? function () {
      apply(fn, this, args);
    } : fn, timeout);
  };
};

// ie9- setTimeout & setInterval additional parameters fix
// https://html.spec.whatwg.org/multipage/timers-and-user-prompts.html#timers
$({ global: true, bind: true, forced: MSIE }, {
  // `setTimeout` method
  // https://html.spec.whatwg.org/multipage/timers-and-user-prompts.html#dom-settimeout
  setTimeout: wrap(global.setTimeout),
  // `setInterval` method
  // https://html.spec.whatwg.org/multipage/timers-and-user-prompts.html#dom-setinterval
  setInterval: wrap(global.setInterval)
});