react-google-url-shortner/example/src/gapi-loader.js

This package includes google url shortner

import scriptjs from 'scriptjs';
import promise from 'promise';

export default onComplete => new promise( (resolve, reject) => {
    if( window.gapi && window.gapi.client ) {
        doResolve( resolve, onComplete );
    } else {
        window.$$onClientLoad = () => {
            doResolve( resolve, onComplete );
        };
        scriptjs( 'https://apis.google.com/js/client.js?onload=$$onClientLoad' );
    }
});

function doResolve( resolve, onComplete ) {
	resolve( window.gapi.client );
	if( onComplete )
		onComplete( window.gapi.client );
}