const memory = new WebAssembly.Memory({ initial: 1 });

const log = (offset, length) => {
  const bytes = new Uint8Array(memory.buffer, offset, length);
  const string = new TextDecoder('utf8').decode(bytes);

  console.log(string);
};

(async () => {
  const response = await fetch('./hello.wasm');
  const bytes = await response.arrayBuffer();
  const { instance } = await WebAssembly.instantiate(bytes, {
    env: { log, memory }
  });

  instance.exports.hello();
})();