code: function jsonp( url, query, fn ) {
  	let prefix = '__jp',
  		timeout = 60000,
  		enc = encodeURIComponent,
  		target = document.getElementsByTagName( 'script' )[ 0 ] || document.head,
  		script,
  		timer,
  		id;
  
  	// generate a unique id for this request
  	id = prefix + count++;
  
  	if ( timeout ) {
  		timer = setTimeout( function() {
  			cleanup();
  			if ( fn ) {
  				fn( new Error( 'Timeout' ) );
  			}
  		}, timeout );
  	}
  
  	function cleanup() {
  		if ( script.parentNode ) {
  			script.parentNode.removeChild( script );
  		}
  
  		window[ id ] = noop;
  		if ( timer ) {
  			clearTimeout( timer );
  		}
  	}
  
  	function cancel() {
  		if ( window[ id ] ) {
  			cleanup();
  		}
  	}
  
  	window[ id ] = function( data ) {
  		debug( 'jsonp got', data );
  		cleanup();
  		if ( fn ) {
  			fn( null, data );
  		}
  	};
  
  	// add qs component
  	url += '=' + enc( id ) + '?' + stringify( query );
  
  	debug( 'jsonp req "%s"', url );
  
  	// create script
  	script = document.createElement( 'script' );
  	script.src = url;
  	target.parentNode.insertBefore( script, target );
  
  	return cancel;
  }
docs: JSONP handler
  
  @param {String} url
  @param {Object} query params
  @param {Function} optional callback