函数 isKeyOf

  • isKeyOf<T extends object>(obj: T, k: string | number | symbol): k is keyof T

  • Type guard for any key, k. Marks k as a key of T if k is in obj.

    类型参数

    • T extends object

    参数

    • obj: T

      object to query for key k

    • k: string | number | symbol

      key to check existence in obj

    返回 k is keyof T

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