合并typescript外部全局接口和继承

在暴露问题之前,我指的项目是: https://github.com/abauzac/nightwatch-typescript

我的问题是Nightwatch定义,它全局导出了很多接口(不是在命名空间或模块内) https://github.com/DefinitelyTyped/DefinitelyTyped/blob/38bd4efd5dc8c666f70d77b020a0b64a13ce3980/types/nightwatch/index.d.ts ),包括:

./node_模块/@类型/夜视:

export interface NightwatchCustomCommands { /* empty interface */ }
export interface NightwatchCustomAssertions { /* empty interface */ }

export interface NightwatchBrowser extends NightwatchCustomCommands, NightwatchCustomAssertions, ... { ... }

export interface NightwatchAssertions extends NightwatchBrowser { ... }

我向Nightwatch添加了自定义命令和断言,并尝试合并NightwatchCustomCommands和NightwatchCustomAssertions:

./类型/索引。d、 输电系统

import {   NightwatchAssertions, NightwatchBrowser } from "nightwatch";

// merge interfaces with nightwatch types

interface NightwatchCustomAssertions  {
    compareScreenshot(this: NightwatchBrowser, filename: string, expected: number, callback: Function);
}

interface NightwatchCustomCommands  {
    wplogin(this: NightwatchBrowser, callback?: Function):this;

    compareScreenshot(this: NightwatchBrowser, filename: string, expected?: number, callback?: Function)
}

Property 'wplogin' does not exist on type 'NightwatchBrowser'.
Property 'compareScreenshot' does not exist on type 'NightwatchAssertions'.

@types和types文件夹都包含在tsconfig“typeroot”中。到目前为止,我尝试将“导出”添加到接口、命名空间。。。不知道我错过了什么。