exitCodes property
Exit codes of the command with their meaning,
except the common ones (0 - success, 2 - error).
Used in a machine readable index of the commands
(see alex agents guide).
Implementation
@override
Map<int, String> get exitCodes => const {
_kExitCodeCheckFailed: 'some checks failed',
_kExitCodeChangedAfterPubGet: 'some files were changed after pub get '
'(with --fail-on-changed-files)',
};