NitroResultValue<T extends Object?> class sealed

Discriminated success/error result for native methods annotated with @NitroResult().

Wire format returned by the native side: [1B tag: 0=ok, 1=err][payload]

• Tag 0 (ok): payload = record-codec bytes for T
• Tag 1 (err): payload = record-codec string (4B length + UTF-8 message)

Dart receives either NitroOk<T> or NitroErr<T> without an exception being thrown. Call sites pattern-match on the sealed type:

final result = await module.login(user, pass);
switch (result) {
  case NitroOk(:final value): print('Logged in: $value');
  case NitroErr(:final message): print('Login failed: $message');
}