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Viewing file:     fromEvent.js (2.18 KB)      -rw-r--r--

import { Observable } from '../Observable';
import { mergeMap } from '../operators/mergeMap';
import { isArrayLike } from '../util/isArrayLike';
import { isFunction } from '../util/isFunction';
import { mapOneOrManyArgs } from '../util/mapOneOrManyArgs';
import { internalFromArray } from './fromArray';
const nodeEventEmitterMethods = ['addListener', 'removeListener'];
const eventTargetMethods = ['addEventListener', 'removeEventListener'];
const jqueryMethods = ['on', 'off'];
export function fromEvent(target, eventName, options, resultSelector) {
    if (isFunction(options)) {
        resultSelector = options;
        options = undefined;
    }
    if (resultSelector) {
        return fromEvent(target, eventName, options).pipe(mapOneOrManyArgs(resultSelector));
    }
    const [add, remove] = isEventTarget(target)
        ? eventTargetMethods.map((methodName) => (handler) => target[methodName](eventName, handler, options))
        :
            isNodeStyleEventEmitter(target)
                ? nodeEventEmitterMethods.map(toCommonHandlerRegistry(target, eventName))
                : isJQueryStyleEventEmitter(target)
                    ? jqueryMethods.map(toCommonHandlerRegistry(target, eventName))
                    : [];
    if (!add) {
        if (isArrayLike(target)) {
            return mergeMap((subTarget) => fromEvent(subTarget, eventName, options))(internalFromArray(target));
        }
    }
    if (!add) {
        throw new TypeError('Invalid event target');
    }
    return new Observable((subscriber) => {
        const handler = (...args) => subscriber.next(1 < args.length ? args : args[0]);
        add(handler);
        return () => remove(handler);
    });
}
function toCommonHandlerRegistry(target, eventName) {
    return (methodName) => (handler) => target[methodName](eventName, handler);
}
function isNodeStyleEventEmitter(target) {
    return isFunction(target.addListener) && isFunction(target.removeListener);
}
function isJQueryStyleEventEmitter(target) {
    return isFunction(target.on) && isFunction(target.off);
}
function isEventTarget(target) {
    return isFunction(target.addEventListener) && isFunction(target.removeEventListener);
}
//# sourceMappingURL=fromEvent.js.map