gistfile1.txt

var videoIdArray = [];
    
var getVideoIds = new Promise( function(resolve, reject) {
    ypi.playlistInfo("AIzaSyCgvxvDPy5djGfZhuqi34wrTh-c1UBhEzU", /*program.*/playlist, function(playlistItems) {
        var videoIds = playlistItems.map(function(item) {
          return item.resourceId.videoId;
        });
        
        resolve(videoIds);
    });
});

getVideoIds.then(function(videoIds) {
  videoIdArray = videoIds;
});