This event is fired when any key is pressed while the terminal is focused.
This event returns a numerical "key code" (for instance, F1 is 290). This value may vary between versions and
so it is recommended to use the constants in the
keys API rather than hard coding numeric values.
string: The event name.
number: The numerical key value of the key pressed.
boolean: Whether the key event was generated while holding the key (
true), rather than pressing it the first time (
Prints each key when the user presses it, and if the key is being held.