TypeScript在d.ts文件上抛出“文件不是模块”错误

Question

我有旧的JS代码，我想在TypeScript中使用它。

考虑我的档案：

webapiClient / index.js

module.exports = require("./rest");

webapiClient / index.d.ts

declare module "webapiClient" {
    class Rest {

        constructor(cfg?:{
            prefix?: string;
            batchGetRequests?: boolean
        });

        prefix: string;
        setCfg(updatedCfgParams: {[key: string]: any}): void;
        get<T>(path: string, params?:any, options?:any): Promise<T>;
        post<T>(path: string, bodyObject?:any): Promise<T>;
        put<T>(path: string, bodyObject?:any): Promise<T>;
        remove<T>(path: string, bodyObject?:any): Promise<T>;
        param(v:any):any;
        processBatch(param:any, options?:any):Promise<any>;
        getUrlParams(url:string, toLower?:boolean):Object;
        getUrlParam(url:string, p:string):Object;
        getUrl(path:string, query?:any):string;
        getPath(path:string, query?:any):string;
        many(ref, p):any;
    }

    export = Rest;
}

我使用以下代码导入我的模块：

import webClient = require("../webapiClient");

但是当我用webpack构建我的项目时，我收到一个错误：

error TS2306: File 'path/to/webapiClient/index.d.ts' is not a module.

怎么了？