code: function showTrace( errorMessage ) {
  	if ( isUndefined( errorMessage ) ) {
  		errorMessage = "";
  	}
  
  	if (
  		! isUndefined( console ) &&
  		! isUndefined( console.trace )
  	) {
  		console.trace( errorMessage );
  	}
  }
docs: Shows and error trace of the error message in the console if the console is available.
  
  @param {string} [errorMessage=""] The error message.
  @returns {void}