--- /dev/null
+/** PURE_IMPORTS_START _Observable,_util_isArray,_util_isFunction,_operators_map PURE_IMPORTS_END */
+import { Observable } from '../Observable';
+import { isArray } from '../util/isArray';
+import { isFunction } from '../util/isFunction';
+import { map } from '../operators/map';
+var toString = /*@__PURE__*/ (function () { return 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(function (args) { return isArray(args) ? resultSelector.apply(void 0, args) : resultSelector(args); }));
+ }
+ return new Observable(function (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) {
+ var unsubscribe;
+ if (isEventTarget(sourceObj)) {
+ var source_1 = sourceObj;
+ sourceObj.addEventListener(eventName, handler, options);
+ unsubscribe = function () { return source_1.removeEventListener(eventName, handler, options); };
+ }
+ else if (isJQueryStyleEventEmitter(sourceObj)) {
+ var source_2 = sourceObj;
+ sourceObj.on(eventName, handler);
+ unsubscribe = function () { return source_2.off(eventName, handler); };
+ }
+ else if (isNodeStyleEventEmitter(sourceObj)) {
+ var source_3 = sourceObj;
+ sourceObj.addListener(eventName, handler);
+ unsubscribe = function () { return source_3.removeListener(eventName, handler); };
+ }
+ else if (sourceObj && sourceObj.length) {
+ for (var 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