From 0bf70c0e2816437b093e1ed5c1015ce9850b14c9 Mon Sep 17 00:00:00 2001
From: utamori <mori_yuta@retail-ai.jp>
Date: Sun, 27 Oct 2024 15:51:22 +0900
Subject: [PATCH] migrate the Result class to sealed class

---
 pkgs/async/CHANGELOG.md               | 4 ++++
 pkgs/async/lib/async.dart             | 2 --
 pkgs/async/lib/src/result/error.dart  | 5 +----
 pkgs/async/lib/src/result/result.dart | 7 ++++---
 pkgs/async/lib/src/result/value.dart  | 5 +----
 5 files changed, 10 insertions(+), 13 deletions(-)

diff --git a/pkgs/async/CHANGELOG.md b/pkgs/async/CHANGELOG.md
index 06ac7d11..39efc9cd 100644
--- a/pkgs/async/CHANGELOG.md
+++ b/pkgs/async/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 2.13.0-wip
+
+- migrate the Result class to sealed class
+
 ## 2.12.0
 
 - Require Dart 3.4.
diff --git a/pkgs/async/lib/async.dart b/pkgs/async/lib/async.dart
index 67480e62..1b489aa2 100644
--- a/pkgs/async/lib/async.dart
+++ b/pkgs/async/lib/async.dart
@@ -24,10 +24,8 @@ export 'src/future_group.dart';
 export 'src/lazy_stream.dart';
 export 'src/null_stream_sink.dart';
 export 'src/restartable_timer.dart';
-export 'src/result/error.dart';
 export 'src/result/future.dart';
 export 'src/result/result.dart';
-export 'src/result/value.dart';
 export 'src/single_subscription_transformer.dart';
 export 'src/sink_base.dart';
 export 'src/stream_closer.dart';
diff --git a/pkgs/async/lib/src/result/error.dart b/pkgs/async/lib/src/result/error.dart
index 48f71b1d..b286786e 100644
--- a/pkgs/async/lib/src/result/error.dart
+++ b/pkgs/async/lib/src/result/error.dart
@@ -2,10 +2,7 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'dart:async';
-
-import 'result.dart';
-import 'value.dart';
+part of 'result.dart';
 
 /// A result representing a thrown error.
 class ErrorResult implements Result<Never> {
diff --git a/pkgs/async/lib/src/result/result.dart b/pkgs/async/lib/src/result/result.dart
index 124ccefa..c6ad350d 100644
--- a/pkgs/async/lib/src/result/result.dart
+++ b/pkgs/async/lib/src/result/result.dart
@@ -7,10 +7,11 @@ import 'dart:async';
 import '../stream_sink_transformer.dart';
 import 'capture_sink.dart';
 import 'capture_transformer.dart';
-import 'error.dart';
 import 'release_sink.dart';
 import 'release_transformer.dart';
-import 'value.dart';
+
+part 'value.dart';
+part 'error.dart';
 
 /// The result of a computation.
 ///
@@ -22,7 +23,7 @@ import 'value.dart';
 ///
 /// A [Future] represents a potential result, one that might not have been
 /// computed yet, and a [Result] is always a completed and available result.
-abstract class Result<T> {
+sealed class Result<T> {
   /// A stream transformer that captures a stream of events into [Result]s.
   ///
   /// The result of the transformation is a stream of [Result] values and no
diff --git a/pkgs/async/lib/src/result/value.dart b/pkgs/async/lib/src/result/value.dart
index 3872dd0b..9c310e4a 100644
--- a/pkgs/async/lib/src/result/value.dart
+++ b/pkgs/async/lib/src/result/value.dart
@@ -2,10 +2,7 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'dart:async';
-
-import 'error.dart';
-import 'result.dart';
+part of 'result.dart';
 
 /// A result representing a returned value.
 class ValueResult<T> implements Result<T> {