fromEvent

Creates an Observable that emits events of a specific type coming from the given event target.

Parameters

target	The DOM EventTarget, Node.js EventEmitter, JQuery-like event target, NodeList or HTMLCollection to attach the event handler to.
eventName	The event name of interest, being emitted by the target.
options	Optional. Default is undefined. Options to pass through to addEventListener
resultSelector	Optional. Default is undefined. Type: (...args: any[]) => T.

import { fromEvent } from 'rxjs';

const clicks$ = fromEvent(document, 'click');
clicks$.subscribe(x => console.log(x));

// Results in:
// MouseEvent object logged to console every time a click
// occurs on the document.