uts插件开发，index.uts里定义的枚举，不能作为公共方法的出入参吗？

在插件的index.uts里定义了如下枚举：

export enum EMMAuthType {  
    trad,  
    reVerify,  
    auto  
}

定义的类和方法：

export class EMMAuthUtil {  
    static setAuthType(type : EMMAuthType) {  
        ESAuthUtil.setAuthType(type.rawValue)  
    }  

    static getAuthType() : EMMAuthType {  
        const rawValue = ESAuthUtil.authType()  
        return EMMAuthType[rawValue]  
    }  
}

编译时报错：

14:15:49.975 error: method cannot be declared public because its parameter uses an internal type  
14:15:49.975 at uni_modules/emm-sdk/utssdk/app-ios/index.uts:72:8  
14:15:49.975 70 |   }  
14:15:49.975 71 |    
14:15:49.975 72 |   static setAuthType(type : EMMAuthType) {  
14:15:49.975    |          ^  
14:15:49.975 73 |    ESAuthUtil.setAuthType(type.rawValue)  
14:15:49.975 74 |   }  
14:15:49.975 method cannot be declared public because its result uses an internal type  
14:15:49.975 at uni_modules/emm-sdk/utssdk/app-ios/index.uts:76:8  
14:15:49.975 74 |   }  
14:15:49.975 75 |    
14:15:49.975 76 |   static getAuthType() : EMMAuthType {  
14:15:49.975    |          ^  
14:15:49.975 77 |    const rawValue = ESAuthUtil.authType()  
14:15:49.975 78 |    return EMMAuthType[rawValue]  
14:15:49.975 uni_modules/emm-sdk/utssdk/app-ios/src/index.swift:108:24: error: method cannot be declared public because its parameter uses an internal type  
14:15:49.975 uni_modules/emm-sdk/utssdk/app-ios/src/index.swift:111:24: error: method cannot be declared public because its result uses an internal type