1 class NewPromise extends Promise{
 2   constructor(fn){
 3 
 4     const fn2 = function(resolve, reject) {
 5       const reject2 = (err) => {
 6         setTimeout(() => {reject(err);}, 0)
 7       };
 8   
 9       try {
10         fn(resolve, reject2);
11       } catch (error) {
12         reject2(error)
13       }
14     }
15 
16 
17     super(fn2);
18   }
19 }
20 
21 window.Promise = NewPromise;