This only works in terminal emulators. In other environments, it does nothing.
ansi_hide_cursor(stream = "auto")ansi_show_cursor(stream = "auto")
ansi_with_hidden_cursor(expr, stream = "auto")
ansi_hide_cursor() hides the cursor.
ansi_show_cursor() shows the cursor.
ansi_with_hidden_cursor() temporarily hides the cursor for
evaluating an expression.
Other terminal capabilities: 
is_ansi_tty(),
is_dynamic_tty()
Other low level ANSI functions: 
ansi_has_any(),
ansi_regex(),
ansi_string(),
ansi_strip()