Sparkplug adds another compiler and “strikes a balance” between the two in that it generates native machine code, but doesn’t depend on information learned while executing the JavaScript code.

At first, Emscripten sounds like the punch line to a tech joke: a compiler that converts C/C++ code into Asm.js, a subset of JavaScript that can then run via a Web browser or in the Node.js framework.

GopherJS also brings Go to JavaScript Joy is not the first attempt at Go-to-JavaScript compilation. The GopherJS compiler also compiles Go code to JavaScript, for running in browsers.