example.js

function getWhateverObject() {
  return Promise.resolve({ getBooleanValue() { return true; } })
}

async function iNeedThisBoolean() {
  const someObject = await getWhateverObject();
  const fWhatever = someObject.getBooleanValue();
  if (fWhatever) {
    console.log("true");
  } else {
    console.log("false");
  }
}