TS | 元素隐式具有“ any”类型，因为类型“ string”的表达式不能用于索引类型“ Record <SecurityMode，boolean>”

Question

我有一个DTO，用于通过其键之一进行映射

DTO和SecurityMode枚举：

enum SecurityMode {
  mode1 = 'mode1’,
  mode2 = 'mode2’,
  mode3 = 'mode3’
}

export default SecurityMode;

import SecurityMode from 'shared/common/enums/SecurityMode';

export default interface IAuthUser {
  security: Record<SecurityMode, boolean>;
}

错误：

Element implicitly has an 'any' type because expression of type 'string' can't be used to index type 'Record<SecurityMode, boolean>'.
  No index signature with a parameter of type 'string' was found on type 'Record<SecurityMode, boolean>'.ts(7053)

这是代码的一部分，出现错误：

{user && user.security && user.security[securityKey] && ( // The error is on user.security[securityKey]
          <Fragment>
            <span">{securityKey}</span>
          </Fragment>
        )}

那么，如何删除此错误？他怎么了

我尝试将安全性更改为：

security: Record<{[key: string]: SecurityMode, boolean}>, but the Record Generic only takes 2 arguments, and when I am putting them into a var, I get that I am using them as values. PLEASE HELP..

Answer 1

  user.security[securityKey as SecurityMode]

问题不在于的类型，user.security而在于的类型securityKey可以是任何字符串，也可以是不属于的字符串user.security。由于undefined/ false在这里具有相同的含义（我假设），将字符串强制转换为字符串文字联合类型是安全的，然后错误应消失。