March 2020
Intermediate to advanced
376 pages
5h 9m
Japanese
Content preview from プログラミングTypeScript ―スケールするJavaScriptアプリケーション開発
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付録GTSX
内部では、TypeScriptはTSXの型付けをカスタマイズできるように、いくつかのフックを公開します。これらはglobal.JSXという名前空間上の特別な型であり、TypeScriptがプログラム全体を通じて、TSXの型に関する「信頼できる情報源」（source of truth）と見なすものです。
![[注記]](/api/v2/epubs/urn:orm:book:9784873119045/files/images/note.png) |
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単にReactを使うのであれば、このような低レベルのフックについて知る必要はありませんが、Reactを使用せずにTSXを使用する独自のTypeScriptライブラリーを作成する場合は、この付録が、使用可能なフックに関する有益なリファレンスになるでしょう。 |
TSXは2種類の要素をサポートしています。組み込み要素（固有の要素）とユーザー定義要素（値ベースの要素）です。固有の要素は常に小文字の名前を持ち、<li>、<h1>、<div>のような組み込み要素を参照します。値ベースの要素はパスカルケース†1の名前を持ち、React（またはTSXと併用している任意のフロントエンドフレームワーク）を使ってプログラマーが作成する要素を参照します。値ベースの要素は、関数またはクラスとして定義することができます。図G-1を参照してください。
[†1] 訳注：「PascalCased」のように、各単語の先頭を大文字にしてつなげた表記法です。
図G-1 TSX要素の種類
例としてReactの型宣言（http://bit.ly/2CNzeW2）を用いて、TSXを安全に型付けするためにTypeScriptが使用するフックについて見てみましょう。Reactでは次のようなTSXのフックの利用により、JSXが安全に型付けされます。 ...
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