TypeScript 3.7 版本已实现了此功能

{
  // before
  const street = user && user.address && user.address.street
  const num = user && user.address && user.address.getNum && user.address.getNum()
  const arr =
    user &&
    user.address &&
    user.address.dataList &&
    user.address.dataList[0] &&
    user.address.dataList[0].details
  console.log(street, num)
}

{
  // now
  const street2 = user?.address?.street
  const num2 = user?.address?.getNum?.()
  const arr2 = user?.address?.dataList?.[0]?.details
  console.log(street2, num2)
}