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typescript中如何通过string类型的索引访问enum类型数据

enum roleMap {
    super = '超级管理员',
    admin = '管理员',
    user = '员工'
}
@Component({
    name: 'UserAvatar'
})
export default class extends Vue {
    get avatar() {
        return UserModule.avatar;
    }

    get name() {
        return UserModule.name;
    }
    get roleName() {
        return roleMap[UserModule.roleCode];
    }
}

vscode报错,enum上没有发现参数类型为string的索引


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