whenOrNull<TResult extends Object?> method Null safety

TResult? whenOrNull<TResult extends Object?>(
  1. TResult? $default(
    1. ThemeMode themeMode
    )?,
  2. {TResult? initial(
      )?,
    1. TResult? errored(
      1. Object error,
      2. StackTrace stackTrace
      )?}
    )
    inherited

    Implementation

    @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  TResult? Function(ThemeMode themeMode)? $default, {
  TResult? Function()? initial,
  TResult? Function(Object error, StackTrace stackTrace)? errored,
}) =>
    throw _privateConstructorUsedError;