This was a little experiment I hacked on over a weekend recently. It uses Rollup & Koa behind the scenes to give a developer an easy & fast environment for a Svelte project. It uses a file system based routing mechanism so you can create new pages just by saving a new file. It also uses on demand compilation, which basically means there is (nearly) no build step during development. The first visitor to the page will trigger the build, but only for that page, which means build times are pretty fast, and most users (all except the first) get the fully compiled assets anyways. It doesn't require any configuration to get started, and can run directly from npx so you don't even need a node_modules folder.