sveltejs/svelte — reverse-engineered prompt

Build me a small Svelte like web development toolkit for people who want to make interactive pages without a lot of boilerplate.

I want to write simple declarative components with markup, script, and styles together, then have a compiler turn those components into efficient plain JavaScript that updates only the parts of the page that actually change. Include a basic component format, reactive values, event handling, conditional rendering, loops, and scoped styles if possible.

Please also make a tiny demo app and playground so I can try components in the browser, plus simple documentation that explains what the tool is, how to install it, how to write a component, and how to build the demo. Keep the developer experience friendly and beginner focused.

Use JavaScript, keep it open source friendly, and look up current docs online if you need to.