I watched a tutorial by the author Rich Harris today after reading this link on HN earlier and stopped when he started talking about a DSL he created for Svelte so you don't have to write as much JS. I don't want to learn another DSL. I don't see what the big deal is about compiling. We've have many languages that compile to JavaScript and Google Closure Compiler to tree shake and minify. For years now! Svelte is a nifty DSL to JS compiler that produces small bundles because there is no SDK to back it up or include. Cool, I guess.