helperText property
final
Text that provides context about the InputDecorator.child's value, such as how the value will be used.
If non-null, the text is displayed below the InputDecorator.child, in the same location as errorText. If a non-null errorText value is specified then the helper text is not shown.
If a more elaborate helper text is required, consider using helper instead.
Only one of helper and helperText can be specified.
Implementation
final String? helperText;