Announcing TypeScript 4.2 - TypeScript

Today we’re excited to announce the release of TypeScript 4.2! For those who aren’t familiar with TypeScript, it’s an extension to JavaScript that adds static types and type-checking. With types, you can state exactly what your functions take, and what they’ll return. You can then use the TypeScript type-checker to catch lots of common mistakes like typos, forgetting to handle null and undefined,

[efcl]

TypeScript 4.2リリース。 Tuple TypesでRest Elementをサポート、Type Aliasの型追跡の改善、オブジェクトではないオペランドに対する`in`演算子のチェックを追加。`noPropertyAccessFromIndexSignature`オプションの追加、`abstract new`のサポートな

[kkeisuke]

“Intl and ResizeObserver‘s”

[narita1980]

4.2になって機能色々と追加されましたね！