How to use the wabt.parseWat function in wabt

function wast2wasm(str) {
  const module = wabt.parseWat("hack.wat", str);
  const { buffer } = module.toBinary({});

  return buffer.buffer;
}

function wastToWasm(content) {
  const module = wabt.parseWat("module.wast", content);
  module.resolveNames();
  module.validate();

  const { buffer } = module.toBinary({ write_debug_names: true });

  return buffer.buffer;
}

exports.evm2wasm = function (evmCode, opts = {
  'stackTrace': false,
  'useAsyncAPI': false,
  'inlineOps': true,
  'testName': 'temp',
  'chargePerOp': false
}) {
  const wast = exports.evm2wast(evmCode, opts)
  const mod = wabt.parseWat('arbitraryModuleName', wast)
  mod.resolveNames()
  mod.validate()
  const bin = mod.toBinary({log: false, write_debug_names: false}).buffer
  mod.destroy()
  return Promise.resolve(bin)
}