Issue encountered when attempting to import Esri types: "Unable to utilize 'new' with an expression that does not have a call or construct signature."

There seems to be a simple solution that I am overlooking. I am currently working on a class that utilizes the Esri ArcGIS API, but I encounter a TypeScript error when importing type definitions from the arcgis-js-api's d.ts file. The error states "Cannot use 'new' with an expression whose type lacks a call or construct signature."

For example:

import * as IMap from 'esri/Map';

export class Foo {
    bar: (Map: IMap) {
        const map = new Map(); // <-- error here
    }
}

Here are relevant excerpts from the d.ts file:

declare namespace __esri {
    /* snip */
    interface Map extends Accessor, LayersMixin {
        allLayers: Collection;
        basemap: Basemap;
        ground: Ground;
    }

    interface MapConstructor {
        new(properties?: MapProperties): Map;
    }

    export const Map: MapConstructor;
    /* snip */
}

declare module "esri/Map" {
    import Map = __esri.Map;
    export = Map;
}

Based on the type definition, everything appears correct. So, what could be causing TypeScript to believe that the IMap type does not have a constructor?

Answer №1

The parameter containing a Map object is of type IMap. To use it as a constructor, you can specify it as typeof IMap:

bar (Map: typeof IMap) {
    const map = new Map(); 
}

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