playgrounds/README.md
You may use these playgrounds to experiment with your changes to SvelteKit. Make sure you don't check in any changes to the files in src that aren't already gitignored. The easiest way to do this is to run the following from the root of the project:
git update-index --skip-worktree playgrounds/basic/src/routes/+layout.svelte
git update-index --skip-worktree playgrounds/basic/src/routes/+page.svelte
Alternatively, clone the kit-sandbox repo next to the kit repo, and use pnpm link to link your dependencies. This way you can have multiple different sandbox projects in different branches, and you never need to worry about accidentally committing throwaway code.