I like to announce Spasm https://github.com/skoppe/spasm
It is a webassembly library to develop single page applications and builds on my previous work (https://forum.dlang.org/post/eqneqstmwfzugymfe...@forum.dlang.org).
It generates fast and small webassembly binaries. The example todo-mvc is only 5995 bytes (wasm) + 2199 bytes (html+js) when gzipped, and loads pretty fast (https://skoppe.github.io/spasm/examples/todo-mvc/)
Spasm can be used with dub and only requires a recent version of ldc. See the readme on github how to get started.
The library includes a webpack bootstrap project to build a production ready web page.
Spasm is written in betterC. Next steps are: - more js host bindings (xhr, localstorage, etc.) - memory deallocation - gather an angry mob to make phobos more betterC compatible ;)