required static method
Check if the value
is is not null, not empty or false.
Returns null
if is valid.
Returns FieldBlocValidatorsErrors.required if is not valid.
Implementation
static String? required(dynamic value) {
if (value == null ||
value == false ||
((value is Iterable || value is String || value is Map) &&
value.length == 0)) {
return FieldBlocValidatorsErrors.required;
}
return null;
}