atom-nuclide/pkg/commons-node/event.js

A unified developer experience for web and mobile development, built as a suite of features on top of Atom to provide hackability and the support of an active community.

Object.defineProperty(exports, '__esModule', {
  value: true
});
exports.attachEvent = attachEvent;
exports.observableFromSubscribeFunction = observableFromSubscribeFunction;

/*
 * Copyright (c) 2015-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the license found in the LICENSE file in
 * the root directory of this source tree.
 */

var _eventKit2;

function _eventKit() {
  return _eventKit2 = require('event-kit');
}

var _rxjsBundlesRxUmdMinJs2;

function _rxjsBundlesRxUmdMinJs() {
  return _rxjsBundlesRxUmdMinJs2 = require('rxjs/bundles/Rx.umd.min.js');
}

/**
 * Add an event listener an return a disposable for removing it. Note that this function assumes
 * node EventEmitter semantics: namely, that adding the same combination of eventName and callback
 * adds a second listener.
 */

function attachEvent(emitter, eventName, callback) {
  emitter.addListener(eventName, callback);
  return new (_eventKit2 || _eventKit()).Disposable(function () {
    emitter.removeListener(eventName, callback);
  });
}

function observableFromSubscribeFunction(fn) {
  return (_rxjsBundlesRxUmdMinJs2 || _rxjsBundlesRxUmdMinJs()).Observable.create(function (observer) {
    var disposable = fn(observer.next.bind(observer));
    return function () {
      disposable.dispose();
    };
  });
}