Don't try svelte kit. This is pseudocode but it's valid. The only symbol show here that is not real is the / that I've placed at the end of folder to show that they are folders. There are other special cases

routes/
+page.ts
(admin)/
  +page.ts
  [user=uuid]/
    [[community]]/
      +page.ts
    posts/
      [...postIds@]/
        +page.ts