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    Function _fnOpt

    • _fnOpt<const T>(
          name: undefined | null | string,
          fn: (arg: T) => boolean,
      ): (arg: T) => boolean
      Internal

      Use a function as the type of an option, but don't treat it as a class.

      Optionally sets the name of a function, useful for error messages.

      Type Parameters

      • const T

      Parameters

      • name: undefined | null | string
      • fn: (arg: T) => boolean

      Returns (arg: T) => boolean

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