函数重载接口参数

我正在尝试使函数重载 search() 功能。此方法必须具有不同的搜索操作。

1. 只搜索字符串类型。
   • search(key: string): IPagination<Employee[]>;
2. 搜索 BasicFilter 类型:
   • search(x: BasicFilter): IPagination<Employee[]>;
3. 搜索 PaginatedFilter 类型:
   • search(y: PaginatedFilter): IPagination<Employee[]>;

我如何检查这个接口的类型 search(args: any): any; 方法?

尝试执行以下操作:

  if (typeof args === BasicFilter) {
    console.log('searched with basic filter arguments');
  }

TS消息: “basicfilter”只引用类型,但在此处用作值。

错误消息: 未定义basicfilter

以下是代码:

接口

interface PageData {
  pageIndex: number;
  pageSize: number;
}

interface Employee {
  id: number;
  name: string;
}

interface BasicFilter {
  key: string;
  is_archived: boolean;
}

interface PaginatedFilter {
  key: string;
  is_archived: boolean;
  page: PageData;
}

interface IPagination<T> {
  length: number;
  list: T;
}

班级

class Service {

  constructor(public name) {}

    search(x: BasicFilter): IPagination<Employee[]>;
    search(y: PaginatedFilter): IPagination<Employee[]>;
    search(key: string): IPagination<Employee[]>;
    search(args: any): any {

      if (typeof args === 'string') {
        console.log('searched with keyword only');
      }

      if (typeof args === 'object') {
        console.log('searched with object arguments');
      }

    }

}

使用

const service = new Service('Serbisyo publiko');

service.search({ key: 'some key', is_archived: false });

const default_page: PageData = { pageIndex: 0, pageSize: 15 };

service.search({ key: 'some queries', is_archived: true, page: default_page });

service.search('filtering data..');

输出

searched with object arguments
searched with object arguments
searched with keyword only

DEMO