Just give any phrase and checkout the sentiment score. A positive score means a positive sentiment, whereas a negative score indicates a negative sentiment. Neutral sentiment is signalled by a near zero score.
// Load wink-sentiment package.
var sentiment = require( 'wink-sentiment' );
// Analyze sentiment.
var result = sentiment( 'Excited to be part of the @imascientist team:-)!' );
console.log( result );