[[型パラメーター (TypeScript)|型パラメーター]]を持つクラス。 ```ts class Wrapper<T> { constructor(public value: T) {} } const v = new Wrapper("hoge"); // ^? const v: Wrapper<string> ``` <button class="playground"><a href="https://www.typescriptlang.org/play?#code/MYGwhgzhAEDqBOYAOSCm8A8AVAfNA3gFDTTAD2AdhAC7wCuw1Z8AFEnQEYgCWw0AbmBB1UALmhYAlAQC+hOYXJVqA6AF5oFVAHc4iFOhYAiABZkA5qiOSA3IQD09kiQB6AfkJA">Playground</a></button>