Function assertParameters

  • Asserts parameters.

    Asserts a function, by wrapping the function and checking its parameters through assert function. If some parameter does not match the expected type, it throws an TypeGuardError or a custom error generated by the errorFactory parameter.

    For reference, TypeGuardError.path would be a little bit different with individual assert function. If the TypeGuardError occurs from some parameter, the path would start from $input.parameters[number].

    By the way, if what you want is not just finding the 1st type error through assertion, but also finding every type errors, then use validateParameters instead. Otherwise, what you want is not only asserting parameters, but also asserting return value, you can use assertFunction instead.

    On the other hand, if don't want to allow any superfluous properties, utilize assertEqualsParameters or validateEqualsParameters instead.

    Type Parameters

    • T extends ((...args: any[]) => any)

      Target function type

    Parameters

    • func: T

      Target function to assert

    • OptionalerrorFactory: ((props: TypeGuardError.IProps) => Error)

      Custom error factory. Default is TypeGuardError

    Returns T

    The wrapper function with type assertions

    A TypeGuardError or a custom error generated by errorFactory

    Jeongho Nam - https://github.com/samchon