JavaScript模块的TypeScript声明

Question

I recently started using a Node library called bpmn-js ( npmjs.com) .
It is written in JavaScript, and I'd like to have typings. Thus, I've began reading about d.ts files.

I created this folder structure

webapp
  @types
     bpmn-js
       index.d.ts

With a simple content

declare module 'bpmn-js' {
  export class BpmnJS {
    constructor();
  }
}

But this doesn't seem to work.

---

"Before" typings, I was able to import the object I needed using

import BpmnJS from 'bpmn-js';

And I was able to instantiate it using

new BpmnJS();

---

How can I get the typings file to be recognized?
I'm using WebStorm 2019.1.* .

Answer 1

Pretty simple, I was missing export default , or better, the default part.

declare module 'bpmn-js' {
  export default class BpmnJS {
    constructor(param?: { container: string });
    ...
  }
}

Now this works too

import BpmnJS from 'bpmn-js';