fetchAndInstantiate('./add.wasm').then(function (instance) {
  console.log(`1 + 2 = ${instance.exports.add(1, 2)}`);
});

// fetchAndInstantiate() found in wasm-utils.js
function fetchAndInstantiate(url, importObject) {
  return fetch(url).then(response =>
    response.arrayBuffer()
  ).then(bytes =>
    WebAssembly.instantiate(bytes, importObject)
  ).then(results =>
    results.instance
  );
}

// providesHelperMethod.js
export function helperMethod() {
  console.info(`I'm helping!`);
}