Extending certain .d.ts definitions

I am trying to use nightmare in typescript with types from DefinitelyTyped. however, the types are incomplete there (method is missing then

) and I also want to add some methods dynamically (as is done in this plugin ).

I don't understand how to extend the Nightmare interface without overlaying Definitely. I read several pages about this question:

Extend the interface defined in the .d.ts file

http://obaidurrehman.github.io/2015/10/30/extending-typeScript-definitions/

So, I tried to create a file extendNightmare.d.ts

that I placed in all other files .ts

.

declare namespace Nightmare {
  class Nightmare {
    waitForDevTools(): void;
    then(): Nightmare;
  }
}

      

        
        
        
      

    

At this point, I don't know what to do to tell the compiler to use my new definition, which should extend the existing one.

I tried adding this line to the top of the file using nightmare, but it didn't work:

/// <reference path="./extendNightmare.d.ts"/>

      

        
        
        
      

    

Also I would like to extend the interface IConstructorOptions

from the namespace Nightmare

, but I don't know how. Is it correct?

declare namespace Nightmare {
  class Nightmare {
    waitForDevTools(): void;
    then(): Nightmare;
  }

  export interface IConstructorOptions {
    switches: any;
  }
}

      

        
        
        
      

    

The code I'm using to reproduce this issue:

/// <reference path="./extendNightmare.d.ts"/>

import * as Nightmare from "nightmare";

const switches = {
  "ignore-certificate-errors": true,
  "proxy-server": "localhost:10000",
};

function render_page(url) {
  const options = {
    switches,
  };

  const nightmare = new Nightmare(options);

  nightmare
  .goto(url)
  .then((infos) => {
    console.info(infos);
  })
  .end()
  .then(() => {
    console.info(`${url}: done`);
  });
}

render_page("https://google.com");

      

        
        
        
      

    

In mine package.json

I have:

"nightmare": "^2.9.1",
"@types/nightmare": "^1.6.30",