Dynamic Route 
by 0753 @0753Ljuc
Given below routes, infer its dynamic params.
| Route | Params Type Definition |
|--------------------------------|------------------------------------------------------------------------------------------------------------|
| `/blog/[slug]/page.js` | `{ slug: string }` |
| `/shop/[...slug]/page.js` | `{ slug: string[] }` |
| `/shop/[[...slug]]/page.js` | `{ slug?: string[] }` |
| `/[categoryId]/[itemId]/page.js` | `{ categoryId: string, itemId: string }` |
| `/app/[...foo]/[...bar]` | `never` - It's ambiguous as we cannot decide if `b` on `/app/a/b/c` is belongs to `foo` or `bar`. |
| `/[[...foo]]/[slug]/[...bar]` | `never` |
| `/[first]/[[...foo]]/stub/[...bar]/[last]` | `{ first: string, foo?: string[], bar: string[], last: string }` |
