Expanding the current @types type definition to encompass additional properties that are currently absent

Currently, I am utilizing the most recent @types for leaflet in my project (v1.2.5), however, they do not align with the latest version of leaflet (1.3.x).

Specifically, their LayerGroup interface lacks a setZIndex property which I need to include by extending the interface so that I can call the function in my TypeScript source code.

Below is the current type definition for a LayerGroup:

/* Type definition here */

Is there any way for me to introduce an additional type definition in my project to add the missing property?

Although I could submit a pull request to incorporate this change in the @types repository, as a temporary solution to continue development, I am looking for an alternative.

typescriptleaflettypescript-typings

Answer №1

To enhance a module, you can declare an augmentation:

// customLeaflet.d.ts
import 'leaflet';
declare module 'leaflet' {
    export interface LayerGroup<P = any> {
        additionalProperty: boolean;
        changeOpacity (value: number) : void;
    }
}

// Another file
/// <reference path="./customLeaflet.d.ts" />    
import 'leaflet';
var customLayer: L.LayerGroup;
customLayer.additionalProperty = true;
customLayer.changeOpacity(0.5);

Important Note: If you're using the @types/leaflet package for type definitions, please ensure that the method and definition match with the latest version available after running npm install @types/leaflet.

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