Catch all routes

[amiralies]

How should one use catch all routes in router?
https://nextjs.org/docs/routing/dynamic-routes#catch-all-routes

I think there's no way of doing this zero cost, right?
we should use an abstract type and then convert that type to an internal type like:

type query = String(string) | Array(array<string>)
type router = {
  // ...
  query: Js.Dict.t<query>,
}

[ryyppy]

Jup, that's a union type..

probably something like this:

module Query: {
  type t
  type case = Array(array<string>) | String(string)
  let classify: t => case
}
= {
  type t
  type case = Array(array<string>) | String(string)

  external unsafeToArray: t => array<string> = "%identity"
  external unsafeToString: t => string = "%identity"

  let classify = (value: t) => {
    if %raw(`function (a) { return  a instanceof Array}`)(value) {
      Array(unsafeToArray(value))
    } else {
      String(unsafeToString(value))
    }
  }
}

Playground Link