wasm.js

let wasm;
fetch('/rust_program_name.wasm')
    .then(res => res.arrayBuffer())
    .then(buf => {
        return WebAssembly.Instantiate(buf, importObject)
            .then(mod => {
                wasm = mod.instance.exports;
                start();
            });
    });

function start() {
  wasm.start();
}
function wasm_one() {
  
}

function wasm_two() {
  
}
var importObject = {
 './rust_program_name': {
   wasm_one: wasm_one,
   wasm_two: wasm_two,
 },
  '__wbindgen_placeholder__': {
    place_holder_fn: function() {},
    wasm_two: function() {},
  }
}