【Flutter】Flutter 3.7.0にアップデートするためにしたことをまとめてみたよ | 技術は熱いうちに打て！_小百科

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itemtype="https://schema.org/ImageObject"><img width="1600" height="1069" src="data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==" data-src="https://blog.dalt.me/wp-content/uploads/2023/01/alistair-mackenzie-EEgtTQPQ81Q-unsplash-1.jpg" class="attachment-1600x1069 size-1600x1069 eye-catch-image wp-post-image" alt="" decoding="async" srcset="https://blog.dalt.me/wp-content/uploads/2023/01/alistair-mackenzie-EEgtTQPQ81Q-unsplash-1.jpg 1600w, https://blog.dalt.me/wp-content/uploads/2023/01/alistair-mackenzie-EEgtTQPQ81Q-unsplash-1-632x422.jpg 632w, https://blog.dalt.me/wp-content/uploads/2023/01/alistair-mackenzie-EEgtTQPQ81Q-unsplash-1-1020x681.jpg 1020w, https://blog.dalt.me/wp-content/uploads/2023/01/alistair-mackenzie-EEgtTQPQ81Q-unsplash-1-420x280.jpg 420w, https://blog.dalt.me/wp-content/uploads/2023/01/alistair-mackenzie-EEgtTQPQ81Q-unsplash-1-768x513.jpg 768w, 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3.7.0にアップデートするためにしたことをまとめてみたよ" target="_blank" rel="nofollow noopener noreferrer"><span class="social-icon icon-hatena"/><span class="button-caption">はてブ</span><span class="share-count hatebu-share-count"/></a><a href="//getpocket.com/edit?url=https://blog.dalt.me/3671" class="share-button pocket-button pocket-share-button-sq" target="_blank" rel="nofollow noopener noreferrer"><span class="social-icon icon-pocket"/><span class="button-caption">Pocket</span><span class="share-count pocket-share-count"/></a><a href="//timeline.line.me/social-plugin/share?url=https%3A%2F%2Fblog.dalt.me%2F3671" class="share-button line-button line-share-button-sq" target="_blank" rel="nofollow noopener noreferrer"><span class="social-icon icon-line"/><span class="button-caption">LINE</span><span class="share-count line-share-count"/></a><a href="" class="share-button copy-button copy-share-button-sq" rel="nofollow noopener noreferrer" data-clipboard-text="【Flutter】Flutter 3.7.0にアップデートするためにしたことをまとめてみたよ https://blog.dalt.me/3671"><span class="social-icon icon-copy"/><span class="button-caption">コピー</span><span class="share-count copy-share-count"/></a></div></div><div class="date-tags"><span class="post-update"><span class="fa fa-history" aria-hidden="true"/> <time class="entry-date date updated" datetime="2023-02-08T13:36:24+09:00" itemprop="dateModified">2023.02.08</time></span><span class="post-date"><span class="fa fa-clock-o" aria-hidden="true"/> <span class="entry-date date published"><meta itemprop="datePublished" content="2023-01-27T22:24:32+09:00"/>2023.01.27</span></span></div></header><div class="entry-content cf is-code-row-number-enable" itemprop="mainEntityOfPage"><h2><span id="toc1">概要</span></h2> どうも、<a rel="noopener" href="https://twitter.com/daiki1003" target="_blank">@daiki1003</a>です！<p><code>Flutter 3.7.0</code>がリリースされましたね！</p><a href="https://blog.dalt.me/3667" title="【Flutter】3.7.0がリリースされたので解説してみたよ" class="blogcard-wrap internal-blogcard-wrap a-wrap cf"><div class="blogcard internal-blogcard ib-left cf"><div class="blogcard-label internal-blogcard-label"><span class="fa"/></div><figure class="blogcard-thumbnail internal-blogcard-thumbnail"><img width="160" height="90" src="data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==" data-src="https://blog.dalt.me/wp-content/uploads/2023/01/fishing-19563_1920-1-160x90.jpg" class="blogcard-thumb-image internal-blogcard-thumb-image wp-post-image" alt="" decoding="async" loading="lazy" srcset="https://blog.dalt.me/wp-content/uploads/2023/01/fishing-19563_1920-1-160x90.jpg 160w, https://blog.dalt.me/wp-content/uploads/2023/01/fishing-19563_1920-1-120x68.jpg 120w, https://blog.dalt.me/wp-content/uploads/2023/01/fishing-19563_1920-1-320x180.jpg 320w" sizes="(max-width: 160px) 100vw, 160px"/><noscript><img width="160" height="90" src="https://blog.dalt.me/wp-content/uploads/2023/01/fishing-19563_1920-1-160x90.jpg" class="blogcard-thumb-image internal-blogcard-thumb-image wp-post-image" alt="" decoding="async" loading="lazy" srcset="https://blog.dalt.me/wp-content/uploads/2023/01/fishing-19563_1920-1-160x90.jpg 160w, https://blog.dalt.me/wp-content/uploads/2023/01/fishing-19563_1920-1-120x68.jpg 120w, https://blog.dalt.me/wp-content/uploads/2023/01/fishing-19563_1920-1-320x180.jpg 320w" sizes="(max-width: 160px) 100vw, 160px"/></noscript></figure><div class="blogcard-content internal-blogcard-content"><div class="blogcard-title internal-blogcard-title">【Flutter】3.7.0がリリースされたので解説してみたよ</div><div class="blogcard-snippet internal-blogcard-snippet"> 前回Flutter 3.3.0が出てから約半年、ようやくマイナーバージョンアップデートとなるFlutter 3.7.0がリリースされました！と同時にDart 2.19.0もリリースされましたね！本記事では、上記記...</div></div><div class="blogcard-footer internal-blogcard-footer cf"><div class="blogcard-site internal-blogcard-site"><div class="blogcard-favicon internal-blogcard-favicon"><img data-src="https://www.google.com/s2/favicons?domain=https://blog.dalt.me" alt="" class="blogcard-favicon-image internal-blogcard-favicon-image lozad lozad-img" loading="lazy" width="16" height="16"/><noscript><img src="https://www.google.com/s2/favicons?domain=https://blog.dalt.me" alt="" class="blogcard-favicon-image internal-blogcard-favicon-image" width="16" height="16"/></noscript></div><div class="blogcard-domain internal-blogcard-domain">blog.dalt.me</div></div><div class="blogcard-date internal-blogcard-date"><div class="blogcard-post-date internal-blogcard-post-date">2023.01.25</div></div></div></div></a><p>本記事では、手元のプロジェクトで<code>3.7.0</code>対応した際に変更したことを<br/> まとめていこうと思っているので興味のある方はぜひちらっと覗いて行って見てください。</p><p>それでは行ってみましょー！</p><h2><span id="toc2">筆者環境</span></h2><p>OS: macOS Ventura 13.1<br/> アップデート前バージョン： Flutter 3.3.7</p><h2><span id="toc3">アップデート内容の紹介</span></h2><h3><span id="toc4">invalid_null_aware_operator</span></h3><a rel="noopener" href="https://dart.dev/tools/diagnostic-messages?utm_source=dartdev&amp;utm_medium=redir&amp;utm_id=diagcode&amp;utm_content=invalid_null_aware_operator#invalid_null_aware_operator" title="Diagnostic messages" class="blogcard-wrap external-blogcard-wrap a-wrap cf" target="_blank"><div class="blogcard external-blogcard eb-left cf"><div class="blogcard-label external-blogcard-label"><span class="fa"/></div><figure class="blogcard-thumbnail external-blogcard-thumbnail"><img data-src="https://blog.dalt.me/wp-content/uploads/cocoon-resources/blog-card-cache/848ddc85b5f29a75c2a781da2d302544.png" alt="" class="blogcard-thumb-image external-blogcard-thumb-image lozad lozad-img" loading="lazy" width="160" height="90"/><noscript><img src="https://blog.dalt.me/wp-content/uploads/cocoon-resources/blog-card-cache/848ddc85b5f29a75c2a781da2d302544.png" alt="" class="blogcard-thumb-image external-blogcard-thumb-image" width="160" height="90"/></noscript></figure><div class="blogcard-content external-blogcard-content"><div class="blogcard-title external-blogcard-title">Diagnostic messages</div><div class="blogcard-snippet external-blogcard-snippet">Details for diagnostics produced by the Dart analyzer.</div></div><div class="blogcard-footer external-blogcard-footer cf"><div class="blogcard-site external-blogcard-site"><div class="blogcard-favicon external-blogcard-favicon"><img data-src="https://www.google.com/s2/favicons?domain=https://dart.dev/tools/diagnostic-messages.html" alt="" class="blogcard-favicon-image external-blogcard-favicon-image lozad lozad-img" loading="lazy" width="16" height="16"/><noscript><img src="https://www.google.com/s2/favicons?domain=https://dart.dev/tools/diagnostic-messages.html" alt="" class="blogcard-favicon-image external-blogcard-favicon-image" width="16" height="16"/></noscript></div><div class="blogcard-domain external-blogcard-domain">dart.dev</div></div></div></div></a><p>Before<br/><code>Overlay.of(context, rootOverlay: true)?.insert(_entry);</code><br/> After<br/><code>Overlay.of(context, rootOverlay: true).insert(_entry);</code></p><p><code>nullable</code>ではないものを、<code>nullable</code>として扱ってしまっている場合に起きる警告です。</p><h3><span id="toc5">deprecated_member_use</span></h3><p>Before</p><pre> TextField( toolbarOptions: const ToolbarOptions(), </pre><p>After</p><pre> TextField( contextMenuBuilder: (context, editableTextState) =&gt; /* 鋭意調査中 */, </pre><p>こちらに関しては、まだ最適解が分かっていないので分かり次第記事を更新し、<a rel="noopener" href="https://twitter.com/daiki1003" target="_blank">@daiki1003</a>からシェアします！ 🙏</p><p>Before</p><pre> ThemeData( textTheme: const TextTheme( button: ..., </pre><p>After</p><pre> ThemeData( textTheme: const TextTheme( labelLarge: ..., </pre><h3><span id="toc6">implicit_call_tearoffs</span></h3><p>Before</p><pre> class Hoge { void call() {} void callFunc(Function() f) { callFunc(Hoge()); </pre><p>After</p><pre> class Hoge { void call() {} void callFunc(Function() f) { callFunc(Hoge().call); </pre><p><code>call</code>メソッドが呼ばれることを期待しているにも関わらず、インスタンスのみしか渡していない場合に起こります。<br/> 素直に、 <code>call</code>を渡しましょう。</p><h2><span id="toc7">combinators_ordering</span></h2><p>Before</p><pre> export 'package:flutter/services.dart' SmartQuotesType, SmartDashesType; </pre><p>After</p><pre> export 'package:flutter/services.dart' SmartDashesType, SmartQuotesType; </pre><p><code>show</code>の内容もアルファベット順でソートしろとのこと。</p><h2><span id="toc8">Dart 2.19.0</span></h2><p>ここからはDartを2.19.0に上げた際に起きた警告です。</p><h3><span id="toc9">use_build_context_synchronously</span></h3><p>Before</p><pre> await sendSomething(...); Navigator.of(context).push&lt;void&gt;(...); </pre><p>After</p><pre> await sendSomething(...); if (context.mounted) { Navigator.of(context).push&lt;void&gt;(...); </pre><p><code>await</code>の後に、<code>BuildContext</code>を利用している場合に怒られます。<br/><code>Flutter 3.7.0</code>で追加された<code>context.mounted</code>を使いましょう。</p><p>しかし、1点不便な点があります。</p><p><code>early return</code>をしようと、<code>context.mounted</code>を否定で確認しようとすると<br/> 同じ<code>use_build_context_synchronously</code>で怒られますｗ</p><p>Bad</p><pre> await sendSomething(...); if (!context.mounted) { // ここで怒られる return; Navigator.of(context).push&lt;void&gt;(...); </pre><p>これは今後の修正に期待ですね。</p><h2><span id="toc10">pedantic_mono 1.21.1</span></h2><p><a rel="noopener" href="https://twitter.com/_mono" target="_blank">@mono</a>さん謹製の<a rel="noopener" href="https://pub.dev/packages/pedantic_mono" target="_blank">pedantic_mono</a>を入れているのですが<br/><code>package.yaml</code>の箇所で怒られていました。</p><p>該当のパッケージは、本日1/26に更新されており、これを更新した際に出た警告も直していきます。</p><h3><span id="toc11">use_string_in_part_of_directives</span></h3><a rel="noopener" href="https://dart-lang.github.io/linter/lints/use_string_in_part_of_directives.html" title="use_string_in_part_of_directives" class="blogcard-wrap external-blogcard-wrap a-wrap cf" target="_blank"><div class="blogcard external-blogcard eb-left cf"><div class="blogcard-label external-blogcard-label"><span class="fa"/></div><figure class="blogcard-thumbnail external-blogcard-thumbnail"><img data-src="https://s.wordpress.com/mshots/v1/https%3A%2F%2Fdart-lang.github.io%2Flinter%2Flints%2Fuse_string_in_part_of_directives.html?w=160&amp;h=90" alt="" class="blogcard-thumb-image external-blogcard-thumb-image lozad lozad-img" loading="lazy" width="160" height="90"/><noscript><img src="https://s.wordpress.com/mshots/v1/https%3A%2F%2Fdart-lang.github.io%2Flinter%2Flints%2Fuse_string_in_part_of_directives.html?w=160&amp;h=90" alt="" class="blogcard-thumb-image external-blogcard-thumb-image" width="160" height="90"/></noscript></figure><div class="blogcard-content external-blogcard-content"><div class="blogcard-title external-blogcard-title">use_string_in_part_of_directives</div><div class="blogcard-snippet external-blogcard-snippet"/></div><div class="blogcard-footer external-blogcard-footer cf"><div class="blogcard-site external-blogcard-site"><div class="blogcard-favicon external-blogcard-favicon"><img data-src="https://www.google.com/s2/favicons?domain=https://dart-lang.github.io/linter/lints/use_string_in_part_of_directives.html" alt="" class="blogcard-favicon-image external-blogcard-favicon-image lozad lozad-img" loading="lazy" width="16" height="16"/><noscript><img src="https://www.google.com/s2/favicons?domain=https://dart-lang.github.io/linter/lints/use_string_in_part_of_directives.html" alt="" class="blogcard-favicon-image external-blogcard-favicon-image" width="16" height="16"/></noscript></div><div class="blogcard-domain external-blogcard-domain">dart-lang.github.io</div></div></div></div></a><p>Before<br/><code>part of my_library;</code><br/> After<br/><code>part of '../my_library.dart';</code><br/> or<br/><code>part of 'package:sample_app/path/to/my_library.dart';</code></p><p><code>library my_library;</code>を定義しているファイルへのパスが必要になりました。<br/> 相対パス、絶対パスどちらも可能です。</p><h3><span id="toc12">unreachable_from_main</span></h3><p>Before</p><pre>

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