TS Playground - An online editor for exploring TypeScript and JavaScript

Popular Documentation PagesEveryday TypesAll of the common types in TypeScript Creating Types from TypesTechniques to make more elegant types More on FunctionsHow to provide types to functions in JavaScript More on ObjectsHow to provide a type shape to JavaScript objects NarrowingHow TypeScript infers types based on runtime behavior Variable DeclarationsHow to create and type JavaScript variables

[jay-es]

Object.keys に型をつけるとランタイムエラーになる例

[t2wave]

User defined type guardsを書くとbool返ったら強制的に推論結果が変わってしまう対策

[aereal]

TypeScript, privateなフィールドでも子孫クラスで同じシグネチャで宣言するとコンパイル通るんだ

[leokun0210]

learn TypeScript !!!