motion/node_modules/disposable-event/lib/index.js

motion - moving development forward

'use strict';

/* @flow */

var _sbEventKit = require('sb-event-kit');

module.exports = function disposableEvent(target, eventName, callback) {
  if (target.on) {
    target.on(eventName, callback);
  } else if (target.addListener) {
    target.addListener(eventName, callback);
  } else if (target.addEventListener) {
    target.addEventListener(eventName, callback);
  } else {
    throw new Error('Unknown event emitter');
  }
  return new _sbEventKit.Disposable(function () {
    if (target.off) {
      target.off(eventName, callback);
    } else if (target.removeListener) {
      target.removeListener(eventName, callback);
    } else if (target.removeEventListener) {
      target.removeEventListener(eventName, callback);
    } else {
      throw new Error('Unknown event emitter');
    }
  });
};