Typescript 枚举给变量提供了错误的类型

我有枚举:

export enum 算法rithmEnum {
    SHA1,
    SHA256,
    SHA512
}

我将其用于一个类的属性算法:

export class Authenticator {
    Type: Type = Type.TOTP;
    Icon: string = '';
    Issuer: string = '';
    Username: string = '';
    Secret: string = '';
    Pin: null = null;
    算法rithm: 算法rithmEnum = 算法rithmEnum.SHA1;
    Digits: number = 6;
    Period: number = 30;
    Counter: number = 0;
    CopyCount: number = 0;
    Ranking: number = 0;

    constructor() {

    }
}

然后，在其中一个组件中，我try 将其与switch 一起使用:

exportUriList() {
    const authData = this.authDataService.authData;
    let uriList: string[] = [];

    authData.Authenticators.forEach(auth => {
      //otpauth://totp/IBM%20Security%20Verify:@USER_NAME@?secret=@SECRET_KEY@&issuer=IBM%20Security%20Verify&algorithm=@ALGORITHM@

      let issuerAndUsername = `${auth.Issuer}:${auth.Username}`;
      let secret = `?secret=${auth.Secret}`;
      let issuer = `&issuer=${auth.Issuer}`;
      let algorithm = '';

      if (auth.算法rithm) {

        switch (auth.算法rithm) {
          case 算法rithmEnum.SHA1:
            break;
          case 算法rithmEnum.SHA256:
            break;
          case 算法rithmEnum.SHA512:
            break;
        }

        algorithm = `&algorithm=${auth.算法rithm}`;
      }

      let uri = 'otpauth://totp/';

    });
}

Seems like should work, right? It doesn't: Why I get this error? It looks like typescript missed one of the enums and there is no proper type?

Type '算法rithmEnum.SHA1' is not comparable to type '算法rithmEnum.SHA256 | 算法rithmEnum.SHA512'.