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import { Observable } from '../Observable'; import { isArray } from '../util/isArray'; import { isFunction } from '../util/isFunction'; import { map } from '../operators/map'; const toString = (() => Object.prototype.toString)(); export function fromEvent(target, eventName, options, resultSelector) { if (isFunction(options)) { resultSelector = options; options = undefined; } if (resultSelector) { return fromEvent(target, eventName, options).pipe(map(args => isArray(args) ? resultSelector(...args) : resultSelector(args))); } return new Observable(subscriber => { function handler(e) { if (arguments.length > 1) { subscriber.next(Array.prototype.slice.call(arguments)); } else { subscriber.next(e); } } setupSubscription(target, eventName, handler, subscriber, options); }); } function setupSubscription(sourceObj, eventName, handler, subscriber, options) { let unsubscribe; if (isEventTarget(sourceObj)) { const source = sourceObj; sourceObj.addEventListener(eventName, handler, options); unsubscribe = () => source.removeEventListener(eventName, handler, options); } else if (isJQueryStyleEventEmitter(sourceObj)) { const source = sourceObj; sourceObj.on(eventName, handler); unsubscribe = () => source.off(eventName, handler); } else if (isNodeStyleEventEmitter(sourceObj)) { const source = sourceObj; sourceObj.addListener(eventName, handler); unsubscribe = () => source.removeListener(eventName, handler); } else if (sourceObj && sourceObj.length) { for (let i = 0, len = sourceObj.length; i < len; i++) { setupSubscription(sourceObj[i], eventName, handler, subscriber, options); } } else { throw new TypeError('Invalid event target'); } subscriber.add(unsubscribe); } function isNodeStyleEventEmitter(sourceObj) { return sourceObj && typeof sourceObj.addListener === 'function' && typeof sourceObj.removeListener === 'function'; } function isJQueryStyleEventEmitter(sourceObj) { return sourceObj && typeof sourceObj.on === 'function' && typeof sourceObj.off === 'function'; } function isEventTarget(sourceObj) { return sourceObj && typeof sourceObj.addEventListener === 'function' && typeof sourceObj.removeEventListener === 'function'; } //# sourceMappingURL=fromEvent.js.map
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