用TypeScript2.8引入的新类型ReturnType获取函数返回值 #4
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看到目前代码里ReturnState 和 ActionType 都用Conditional Types 获取函数的返回值，其实TypeScript 2.8 已经内置了一个利用Conditional Types获取函数返回值的类型 ReturnType，可以用在ReturnState和ActionType的定义里简化代码。 🙂