• Extracts a value of the existential quantified type F<A> with a runner.

    Type Parameters

    • F

    • R

    Parameters

    • runner: (<A>(item) => R)

      A function to get the internal item F<A>, but the type A will be specified by an object Exists<F>.

        • <A>(item): R
        • Type Parameters

          • A

          Parameters

          Returns R

    Returns ((exists) => R)

    The result of runner.

      • (exists): R
      • Parameters

        Returns R

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