function alert alert(message?: string): void Shows the given message and waits for the enter key pressed. If the stdin is not interactive, it does nothing. Examples Example 1 // Displays the message "Acknowledge me! [Enter]" and waits for the enter key to be pressed before continuing. alert("Acknowledge me!"); Parameters optional message: string Return Type void Seehttps://developer.mozilla.org/en-US/docs/Web/API/Window/alert