A while back, @mjbvz filed microsoft/TypeScript#18458 on the TypeScript side. The idea is that it would be great if we could easily transform.

// Hello
someFunc();
someOtherFunc();

into something like

if ([|condition|]) {
  // Hello
  someFunc();
  someOtherFunc();
}

as a refactoring. (The [|condition|] here represents a tab-stop where a user can start filling in condition as a placeholder).

The consensus there was that "surround with" is often simple enough that it could be provided through snippets. This won't always be precise, but it's good enough. Taking a look at the documentation, it seems like we can leverage $TM_SELECTED_TEXT in existing snippets to add this behavior.