如何理解 TypeScript 中的这个通用接口定义？

Question

Does the definition of this Cache type, Cache<V = any> , define an object or a function?

Here the generic V , why specify an any ? What does the equals sign mean?

export interface Cache<V = any> {
  value?: V;
  timeoutId?: ReturnType<typeof setTimeout>;
  time?: number;
  alive?: number;
}

Answer 1

Cache defines an object here. V = any means that V is of type any if no generic value is provided, and the value in this object is also of type any . The equal sign here means the default value.