相关疑难解决方法(0)

export class LoginInfo {
    userName: string;
    password: string;
} 

public getLoginInfo(id: number): Promise<LoginInfo> {
    return this.http.get(this.url + id + '/' + '/loginInfo')
        .toPromise()
        .then(response => response.json() as LoginInfo)
        .catch((error: Response) => {
            this.handleError(error);
        });
}

获得了用于从API控制器检索数据的代码。在ts中进行编译时，总是会出现以下错误：

Type 'Promise<void | LoginInfo>' is not assignable to type 'Promise<LoginInfo>'
Type 'void' is not assignable to type 'LoginInfo'

这是我的软件包版本：

"typescript": "2.5.2",
"@angular/compiler": "4.3.6"
"@angular/compiler-cli": "4.3.6"