TSX Default Generic Arrow Function Syntax Highlighting

Does this issue occur when all extensions are disabled?: Yes

• VS Code Version: Version: 1.78.2
• OS Version: Darwin arm64 21.3.0

Related to https://github.com/microsoft/TypeScript/issues/47062
TSC has been updated to successfully parse the below TSX code snippet:

const Component = <T = undefined>(props: PropType<T>) => <p>content</p>

however this currently breaks the syntax highlighting in VSCode's typescriptreact parser.

The same can be said for the trailing comma added by prettier (3.0.3):

const Component = <T = undefined,>(props: PropType<T>) => <p>content</p>

Some short term work-arounds are available:

Using extends

const Component = <T extends unknown = undefined>(props: PropType<T>) => <p>content</p>

Using function syntax

const Component = function<T = undefined>(props: PropType<T>) {
  return <p>content</p>
}

Despite these workarounds, the original code seems syntactically valid, and more concise, so I believe this to be a bug

VS Code で typescriptreact パーサーを使って、ジェネリックなアロー関数の 2 つのスニペットを再現し、そのハイライトを workaround の例と比較します。次に、リポジトリの TextMate 文法ファイルを調べて TypeScript JSX のルールを確認します。両方の有効な形式が正しくハイライトされ、示されている workaround にリグレッションがなければ完了です。