Function isUndefined

  • isUndefined<T = unknown>(
        val?: T,
        errorOrMessage?: string | Error,
    ): asserts val is undefined

    Asserts that a value is undefined.

    Type Parameters

    • T = unknown

    Parameters

    • Optionalval: T

      Value to check

    • OptionalerrorOrMessage: string | Error

      Error object or message to throw if the value is not undefined

    Returns asserts val is undefined

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