src/index.js
function getTimeStamp() {
    return isBrowser && (window.performance || {}).now ? window.performance.now() : new Date().getTime();
}
function getTimeStamp() {
    return isBrowser && (window.performance || {}).now ? window.performance.now() : new Date().getTime();
}
function getTimeStamp ( ) { return isBrowser && ( window . performance || { } ) . now ? window . performance . now ( ) : new Date ( ) . getTime ( ) ; }
Returns a time stamp in milliseconds

@returns {number}
Returns a time stamp in milliseconds