A better example for a typed function would be something like:

    function Request(string method, string url, RequestOptions options) : Result {...}

or

    Result Request(string method, string url, RequestOptions options) {...}

Here, we know `url` is a string (rather than the parsed object), we know all the supported options (they're members of the RequestOptions object/enum), and every value in the return value. Some might suggest even making `method` an enumeration.

If the function name was better, you could call that function right now without needing any more information.

Also, especially if you're a fan of defensive programming, most of the basic argument checking is performed at compile time, leaving the function body cleaner.

Based on your example alone, perhaps you don't have enough experience with typed languages to appreciate the benefits. I don't mean that in a belittling way, but more of an invitation to learn more about the craft.