https://github.com/staltz/callbag-to-rxjs

👜 Convert a listenable callbag source to an RxJS Observable
https://github.com/staltz/callbag-to-rxjs

Last synced: 26 days ago
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👜 Convert a listenable callbag source to an RxJS Observable

• Host: GitHub
• URL: https://github.com/staltz/callbag-to-rxjs
• Owner: staltz
• License: mit
• Created: 2018-02-16T19:10:00.000Z (over 6 years ago)
• Default Branch: master
• Last Pushed: 2018-02-16T19:10:20.000Z (over 6 years ago)
• Last Synced: 2024-10-09T09:47:32.262Z (about 1 month ago)
• Language: JavaScript
• Size: 4.88 KB
• Stars: 4
• Watchers: 4
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: readme.js
  • License: LICENSE

Awesome Lists containing this project

• awesome-callbags - to-rxjs

README

        
/**

 * callbag-to-rxjs

 * ---------------

 *

 * Convert a listenable callbag source to an RxJS Observable.

 *

 * `npm install callbag-to-rxjs`

 *

 * Example:

 *

 *     const {pipe, interval, take, filter, map} = require('callbag-basics');

 *     const toRx = require('callbag-to-rxjs');

 *     require('rxjs/add/operator/startWith');

 *

 *     const observable = pipe(

 *       interval(1000), // 0,1,2,3,4,5,6,7,...

 *       take(5), // 0,1,2,3,4

 *       filter(x => x !== 0), // 1,2,3,4

 *       map(x => x * 10), // 10,20,30,40

 *       toRx

 *     );

 *

 *     observable.startWith(0).subscribe({

 *       next: x => console.log(x)

 *     });

 */

const {Observable} = require('rxjs/Observable');

function toRx(source) {

  return Observable.create(function subscribe(observer) {

    let talkback;

    try {

      source(0, (t, d) => {

        if (t === 0) talkback = d;

        if (t === 1) observer.next(d);

        if (t === 2 && d) observer.error(d);

        else if (t === 2) talkback = void 0, observer.complete(d);

      });

    } catch (err) {

      observer.error(err);

    }

    return function unsubscribe() {

      if (talkback) talkback(2);

    };

  });

}

module.exports = toRx;