javascript - 如何正确地在函数中编写一个使流程满意的条件？

Question

如何在函数中正确编写条件使流程满意？

我的函数应该能够处理 2 种不同的数据类型。

链接:https://flow.org/try/#0C4TwDgpgBAqgzhATgZQJYFswBtoF4oBQUUA3gD5HEDUAdgIboQBcUcwiqNA5gDSVRU4AV0QQAcg2at2nXpTIBfAgVCRYCFEMiJi+SuX7UaqAMYBrCYxZsO3PsUXLV0eEij5XKDNmhl1SZC0kAG5lAgAzIRoTYFQAexooLghgTwAKIQ0WTwBKUkpUcIyNADp6RjySSgBIUWARRMykEuFRSwhKBSgILAR84ig6hqgmxDLTC0lOgi6oIA

// @flow

type UserSimple = {|
  +name: string,
  +sureName: string,
|};

type UserSuper = {|
  +nickName: string,
|};

type User = UserSimple | UserSuper;

function getUser(user: User) {
  if (user.name) {
    return user.sureName;
  }
  return user.nickName;
}

Answer 1

恐怕没有不必要的代码是不可能做到的。

参见https://github.com/facebook/flow/issues/8079

现在您可以添加一些额外的检查和注释，表明此检查仅适用于流程。例如:https://flow.org/try/#0C4TwDgpgBAqgzhATgZQJYFswBtoF4oBQUUA3gD5HEDUAdgIboQBcUcwiqNA5gDSVRU4AV0QQAcg2at2nXpTIBfAgVCRYCFEMiJi+SuX7UaqAMYBrCYxZsO3PsUXLV0eEij5XKDNmhl1SZC0kAG5lAgAzIRoTYFQAexooLghgTwAKIQ0WTwBKUkpUcIyNADp6RjySSgBIUWARRMykEuFRSwhKBSgILAQoQqg05zjwqCbEMtMLSXdcfAByG1l5yv46hrHS43N2zoIuqCA