You could already compile programs from other languages to javascript. https://github.com/jashkenas/coffeescript/wiki/List-of-languages-that-compile-to-JS http

You could already compile programs from other languages to javascript. https://github.com/jashkenas/coffeescript/wiki/List-of-languages-that-compile-to-JS https://github.com/jashkenas/coffeescript/wiki/List-of-langu... Wasm was effectively an extension of asm.js. It makes the experience of compile-to-web better, but it isn't much more opaque than other projects.