A new kid on the block.
The main promise is to address performance at compilation time. The resulting package does not include a runtime such as Vue and React. This improve the loading performance and the runtime performance.
While trying it in 2019 for basic projects. I have a nice feeling about the concepts and how they are deployed. Yet the tooling were a bit cluncky at the beginning.
Svelte NodeGUI for building desktops apps, regretably iOS and Android are missing.