narrowOrCrash (method)

Abstract narrowOrCrash

• narrowOrCrash<U>(guard, errorFactory?): Opt<U>

• Similar to Opt.narrow, but crashes on a narrowing failure.

  Type Parameters

  • U

  Parameters

  • guard: ((value) => value is U)

    • • (value): value is U

      • Parameters

        • value: any

        Returns value is U

  • Optional errorFactory: (() => unknown)

    • • (): unknown

      • Returns unknown

  Returns Opt<U>

  See

  Opt.narrow

• narrowOrCrash<U>(guard, crashMessage?): Opt<U>

• Type Parameters

  • U

  Parameters

  • guard: ((value) => value is U)

    • • (value): value is U

      • Parameters

        • value: any

        Returns value is U

  • Optional crashMessage: string

  Returns Opt<U>