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https://github.com/keillion/mutablepromise
Wrapper for Promise. Resolvable, rejectable, redirectable.
https://github.com/keillion/mutablepromise
Last synced: 2 months ago
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Wrapper for Promise. Resolvable, rejectable, redirectable.
- Host: GitHub
- URL: https://github.com/keillion/mutablepromise
- Owner: Keillion
- License: unlicense
- Created: 2022-03-16T08:01:51.000Z (almost 3 years ago)
- Default Branch: main
- Last Pushed: 2024-09-03T08:44:05.000Z (4 months ago)
- Last Synced: 2024-10-16T01:33:07.839Z (2 months ago)
- Language: JavaScript
- Size: 21.5 KB
- Stars: 1
- Watchers: 2
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
# MutablePromise
Wrapper for Promise. Resolvable, rejectable, redirectable.
## Import
install
```
npm i mutable-promise -S
```
```
yarn add mutable-promise
```
import
```mjs
import MutablePromise from 'mutable-promise';
```
```js
const MutablePromise = require('mutable-promise');
```
CDN
```html
import MutablePromise from 'https://cdn.jsdelivr.net/npm/[email protected]/dist/index.esm.min.js';
```
```html
```
## Example
`resolve` outside of the executor.
Get `status` of the `promise`.
```js
// can use like a native `Promise`
let p = new MutablePromise((_, rj)=>setTimeout(rj,100)); // try to reject after 100ms
// can get status
console.log(p.status); // "pending"
console.log(p.isPending); // true
// can resolve outside
p.then(anything=>console.log(anything)); // 'resolve called'
p.resolve('resolve called'); // resolve immediately
console.log(p.status); // "fulfilled"
console.log(p.isFulfilled); // true
(async()=>{
await new Promise(rs=>setTimeout(rs,200)); // wait 200ms
// status will not change after `fulfilled` or `rejected`
console.log(p.status); // "fulfilled"
console.log(p.isFulfilled); // true
})();
```
`reject` outside of the executor.
```js
let p = new MutablePromise(rs=>setTimeout(rs,100)); // try to resolve after 100ms
// can reject outside
p.catch(anything=>console.log(anything)); // 'reject called'
p.reject('reject called'); // reject immediately
console.log(p.status); // "rejected"
console.log(p.isRejected); // true
```
Allow setting a `promise` as argument.
```js
// simple promise
new MutablePromise(Promise.resolve('1'));
// typical promise
let nativeP = new Promise(rs=>setTimeout(rs,200));
new MutablePromise(nativeP);
// wrapper a fetch
new MutablePromise(fetch('./'));
// nested MutablePromise
let p = new MutablePromise(rs=>setTimeout(rs,200));
new MutablePromise(p);
// promise like
let pLike = { then: function(){ return 'a'; } };
new MutablePromise(pLike);
```
Allow setting no argument or `null`. Then define a `task` later.
```js
let p = new MutablePromise(); // or `new MutablePromise(null)`
p.then(anything=>console.log(anything)); // 'msg from later define task'
// The property `task` can accept the same parameter type as the constructor of `MutablePromise`
p.task = rs=>rs('msg from later define task');
```
Can change `task` before `fulfilled` or `rejected`.
```js
let p = new MutablePromise(rs=>setTimeout(()=>{rs('original task')},100));
p.then(anything=>console.log(anything)); // 'new task'
p.task = new MutablePromise(rs=>setTimeout(()=>{rs('new task')},200));
```
A change make no sense after `fulfilled` or `rejected`.
```js
let p = new MutablePromise(Promise.resolve('resolved'));
p.then(anything=>console.log(anything)); // 'resolved'
(async()=>{
// wait next js event loop
await new Promise(rs=>setTimeout(rs,0));
console.log(p.status); // "fulfilled"
p.catch(anything=>console.log(anything)); // will not log anything
p.task = Promise.reject('make no sense');
await new Promise(rs=>setTimeout(rs,0));
p.task = (rs)=>{
console.log('function still run after `fulfilled` or `rejected`');
rs('but will not resolve or reject');
};
})();
```
Set `task` as `null` can cancel the orignial task.
```js
let p = new MutablePromise(resolve=>setTimeout(()=>{
console.log('the executor will run anyway');
resolve('original task');
},100));
p.then(anything=>console.log(anything)); // will not log anything
p.task = null;
// the promise will keep `pending`
setTimeout(()=>{
console.log(p.status);
},200)
// you can define a new `task` later
```
If a `MutablePromise` has been `fulfilled` or `rejected`, you can define a new `MutablePromise` instead.
```js
(async()=>{
let p = new MutablePromise(Promise.resolve());
await new Promise(rs=>setTimeout(rs,0)); // wait next js event loop
console.log(p.status); // "fulfilled"
p = new MutablePromise(resolve=>setTimeout(()=>{resolve('you can define a new `MutablePromise` instead')},100));
p.then(anything=>console.log(anything));
})();
```
## TODO
Maybe need to wrap other promise function like `all`, `resolve`, `race` and so on, to `MutablePromise` edition.