babel-plugin-asm-js

Compiles statically typed ES6 (Flow-flavoured) module into asm.js while preserving ES6 module interface. Still a subset of JavaScript, but much more suitable for hand-writing (so that you don't need to use C/C++ -> Emscripten -> asm.js for maths)

Work in progress.

Currently supported:

• ES6 import and named export
• automatic var, let, const extraction and conversion
• automatic function layout
• function parameter annotations
• function return type annotation
• assignment with automatic type conversion
• Flow type cast into asm.js type cast
• automatic asm.js imports for stdlib and foreign references
• automatic program layout
• automatic wrapping into asm.js module with initialize for passing own heap

TODO:

• bug fixing
• global variable support
• string support (literals are already converted to IDs, need to support operations)
• better asm.js<->normal code communication
• limited object and array support

Installation

$ npm install babel-plugin-asm-js

Usage

Via .babelrc (Recommended)

.babelrc

{
  "plugins": ["asm-js"]
}

Via CLI

$ babel --plugins asm-js script.js

Via Node API

require("babel-core").transform("code", {
  plugins: ["asm-js"]
});