defaultCountdownText static method
Default formatter for countdownTextBuilder: produces "Code valid for M:SS",
where the seconds are zero-padded to 2 digits and the minutes are not padded.
Implementation
static String defaultCountdownText({required int secondsCountdown}) =>
"Code valid for "
"${secondsCountdown ~/ 60}:${(secondsCountdown % 60).toString().padLeft(2, '0')}";