[Feature] Warn when target directory already exists and is not empty ✅

[Kamleshpaul]

Which project does this relate to?

Create Tanstack App

Describe the feature

Currently, when running

pnpm create @tanstack/start@latest

and specifying a directory name that already exists (for example, an existing Next.js project folder), the setup proceeds and installs TanStack Start inside that directory — even if it is not empty.

It would be helpful to have a check to detect if the target directory already exists and is not empty, and show a warning or confirmation prompt before continuing. This would help prevent accidental overwriting of existing files or projects.

Example

$ pnpm create @tanstack/start@latest test
⚠️ The directory "test" already exists and is not empty. 
Do you want to continue? (y/N)

Why This Is Needed

This feature would improve safety and developer experience by preventing users from unintentionally installing TanStack Start into non-empty folders.

Additional context

No response