message: please add for adding svelte support
diff: <script lang="ts">
  - const add = (a: number, b: number) => a + b;
  -
  - add(1, 2);
  -
  const hello = 'hello';
  -
  const bob = hello + ' bob';
  -
  - function GroupList({ groups, onGroupClick, onGroupStart }) {}
  -function useCurrentUser() {
  - return { currentUser: {} };
  -}
  -function useBrowser() {
  - return { isSafari: false };
  -}
  -
  </script>
  <div>Hello World</div>
  \ No newline at end of file
  