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

This package includes google url shortner

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

/* function which return promise for client load */
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 which returns resolve state if window.gapi.client is true else recall the onComplete function*/
function doResolve( resolve, onComplete ) {
  resolve( window.gapi.client );
	if( onComplete ) {
		onComplete( window.gapi.client );
  }
}