 /* exported trace */

// Logging utility function.
function trace(arg) {
  var now = (window.performance.now() / 1000).toFixed(3);
  console.log(now + ': ', arg);
}

 /* exported trace */

// Logging utility function.
function trace(arg) {
  const now = (window.performance.now() / 1000).toFixed(3)
  console.log(`${now}: `, arg);
}

Update trace function to template string.
Update trace function to template string.
