Expanding external type declarations within Typescript

I am currently working with Typescript and the ant design library. My goal is to extend an existing interface by adding a single property. To start, I imported the original interface so you can see the folder structure:

import { CollapseProps } from 'antd/lib/collapse/Collapse';

However, I'm unsure of how to properly extend it.

I have created a typings/antd folder in the project root directory, added paths configuration to the tsconfig.json file (including the baseUrl):

"paths": {
  "antd": [
    "node_modules/antd",
    "typings/antd"
   ]
 }

I've attempted various ways to export extended interfaces such as:

export interface CollapsePanelProps {
  showArrow?: boolean;
}

in the typings/antd/index.d.ts file

Alternatively, I tried replicating the antd folder structure by placing the Collapse.d.ts file inside typings/antd/collapse

or attempted declaring a namespace 'antd' in my typings file and including the interface within.

Unfortunately, none of these approaches seem to be working.

typescripttypescript-typingsantd

Answer №1

From what I gather, declaration files are primarily meant for external JavaScript files.

Is it possible to simply extend the initial interface and incorporate your own interface into your code?

import {CollapsePanelProps as OriginalCollapsePanelProps} from 'antd/Collapse';

export interface CollapsePanelProps extends OriginalCollapsePanelProps {
  showArrow?: boolean;
}

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