WebAssembly is currently being designed as an open standard by the W3C Community Group that includes representatives from all major browsers. There are two major libraries for JavaScript ffi - wasm-bindgen and stdweb. Eventually, they will share the same build tools. But at the moment to build wasm-bindgen project - wasm-pack is required, and for stdweb there is a cargo-web. Current ffi bindings for JavaScript api are quite low-level. There is an initiative to build a modular toolkit named gloo

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