Vanilla JS ES6 Wait on Element

WaitOnElement.js

function wait_on_element( query_selector , check_interval=500 , timeout=20000 ) {
	return new Promise( function( resolve , reject ) {
		try {
			let READY_CHECK_INTERVAL = setInterval( function () {
				let element = document.querySelectorAll( query_selector );
				if ( element ) {
					if ( element[ 0 ] ) {
						clearInterval( READY_CHECK_INTERVAL );
						resolve( element[ 0 ] );
						return;
					}
				}
			} , check_interval );
			setTimeout( function () {
				clearInterval( READY_CHECK_INTERVAL );
				resolve();
				return;
			} , timeout );
		}
		catch( error ) { console.log( error ); resolve( false ); return; }
	});
}

WaitOnElement.min.js

function wait_on_element(e,t=500,n=2e4){return new Promise((function(r,o){try{let o=setInterval((function(){let t=document.querySelectorAll(e);if(t&&t[0])return clearInterval(o),void r(t[0])}),t);setTimeout((function(){clearInterval(o),r()}),n)}catch(e){return console.log(e),void r(!1)}}))}