App: [$250] [Cleanup] Utility URL type for getURLWithBackParam, etc...

Coming from https://github.com/Expensify/App/pull/31543#discussion_r1405420130…

Problem

We’ve got some types that look like this:

function getUrlWithBackToParam<TUrl extends string>(url: TUrl, backTo?: string): `${TUrl}` | `${TUrl}?backTo=${string}` | `${TUrl}&backTo=${string}` {
    ...
}

and while that works it’s a pretty verbose way to express a pretty common format for something.

Solution

This is a rich representation of what this string could / should look like, instead of just being string, but let’s clean this up to make it more extensible/reusable. We should make a utility type for URLs that takes:

• A base URL
• an object type representing a series of optional or required query params (which of course can be in any order)

Then the resultant type would be any string matching the pattern of a valid URL with the correct base and query params.

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