new PromiseAsync(Promise.resolve("hello"))
  .subscribe({
    onStart:()=>{
      console.log("onStart")
    },
    onComplete:(data)=>{
      console.log("onComplete", data)
    },
    onError:()=>{
      //...
    }
  })
  .start();
 
  /**
    output:
      onStart
      onComplete, hello
  */
 

 
  promise to Async events `onStart, onComplete, onProgress, onError`
 
  --> START ------------------------- COMPLETE -
    |                                          |
    |                                          |---- ERROR
    |                                          |
    |0%------------- PROGRESS -------------100%|
 
 

 
  npm install promise-to-async-events
 
  import PromiseAsync from "promise-to-async-events";
 
  new PromiseAsync( Promise.resolve("hello") )
  .merge(Promise.resolve("world"))
  .subscribe((data1, data2)=>{
    // data1 = hello, data2=world
  })
  .start();
 

 
  new PromiseAsync( Promise.resolve(1), Promise.resolve(2))
  .flat((n1, n2)=>{
    return Promise.resolve(n1 + n2);
  })
  .subscribe((data)=>{
    // data=3...
  })
  .start()
 

 
    new PromiseAsync( Promise.resolve(1), Promise.resolve(2) )
    .subscribe({
      onStart:()=>{},
      onComplete:(a,b)=>{/*a=1,b=2*/},
      onProgress:{}=>{},
      onError:{}=>{}
    })
    .start()
 

 
    new PromiseAsync( JSONP("http://www.baidu.com") )
    .mrege(JSONP("xxxx"))
    .subscribe((data1, data2)=>{
      //...
    })
    .start()