This step should feel familiar, we are going to use cargo to compile our bincode_parser library and then use wasm-bindgen to generate our js bindings. 
$ cargo +nightly build --target wasm32-unknown-unknown
$ wasm-bindgen ./target/wasm32-unknown-unknown/debug/bincode_parser.wasm --out-dir .
After this you should have a file called bincode_parse_bg.wasm and bincode_parser.js in your project's root.