> the languages that compile to javascript are a poor substitute (bloated code sizes, interop issues, poor runtime performance, etc) js_of_ocaml has good code

> the languages that compile to javascript are a poor substitute (bloated code sizes, interop issues, poor runtime performance, etc) js_of_ocaml has good code size and performance in my experience. Interop with js is variable -- some js libraries are inherently typed and are easy to bind to in a well typed way, others use very dynamic typing and those are difficult to bind.