TypeScript types for the format GeoJSON cause compilation errors

Describe the bug I am using OpenLayers 6.15.1 in an Angular 14 application and when I make use of the GeoJSON format I get the following compilation errors:

ERROR: node_modules/ol/format/GeoJSON.d.ts:2:36 - error TS2307: Cannot find module 'geojson' or its corresponding type declarations.

2 export type GeoJSONObject = import("geojson").GeoJSON;
node_modules/ol/format/GeoJSON.d.ts:3:37 - error TS2307: Cannot find module 'geojson' or its corresponding type declarations.

3 export type GeoJSONFeature = import("geojson").Feature;
node_modules/ol/format/GeoJSON.d.ts:4:47 - error TS2307: Cannot find module 'geojson' or its corresponding type declarations.

4 export type GeoJSONFeatureCollection = import("geojson").FeatureCollection;
node_modules/ol/format/GeoJSON.d.ts:5:38 - error TS2307: Cannot find module 'geojson' or its corresponding type declarations.

5 export type GeoJSONGeometry = import("geojson").Geometry;
node_modules/ol/format/GeoJSON.d.ts:6:35 - error TS2307: Cannot find module 'geojson' or its corresponding type declarations.

6 export type GeoJSONPoint = import("geojson").Point;
node_modules/ol/format/GeoJSON.d.ts:7:40 - error TS2307: Cannot find module 'geojson' or its corresponding type declarations.

7 export type GeoJSONLineString = import("geojson").LineString;
node_modules/ol/format/GeoJSON.d.ts:8:37 - error TS2307: Cannot find module 'geojson' or its corresponding type declarations.

8 export type GeoJSONPolygon = import("geojson").Polygon;
node_modules/ol/format/GeoJSON.d.ts:9:40 - error TS2307: Cannot find module 'geojson' or its corresponding type declarations.

9 export type GeoJSONMultiPoint = import("geojson").MultiPoint;
node_modules/ol/format/GeoJSON.d.ts:10:45 - error TS2307: Cannot find module 'geojson' or its corresponding type declarations.

10 export type GeoJSONMultiLineString = import("geojson").MultiLineString;
node_modules/ol/format/GeoJSON.d.ts:11:42 - error TS2307: Cannot find module 'geojson' or its corresponding type declarations.

11 export type GeoJSONMultiPolygon = import("geojson").MultiPolygon;
node_modules/ol/format/GeoJSON.d.ts:12:48 - error TS2307: Cannot find module 'geojson' or its corresponding type declarations.

12 export type GeoJSONGeometryCollection = import("geojson").GeometryCollection;

The error disappears if I add the following dependency: npm install @types/geojson --save-dev

To Reproduce Steps to reproduce the behavior:

1. ng new test-app
2. cd test-app
3. npm install ol
4. Add lines 2 and 10 to app.component.ts

import { Component } from '@angular/core';
import GeoJSON from 'ol/format/GeoJSON';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.scss']
})
export class AppComponent {
  myType = GeoJSON;
  title = 'test-app';
}

1. ng build

Expected behavior Not to have to add the dependency @types/geojson in order to get rid of the compilation errors. The same issue happens with the format EsriJSON, so I am guessing that the installation of multiple dependencies may potentially be required.

[ahocevar]

@mediafreakch That’s a different issue, which was reported recently in #13924.

[javier-lopez-1s]

You get the same error if you import the format TopoJSON, as this is in turn importing types from topojson-specification. In a few days I will create a PR in which I will be moving the 3 items below:

• @types/arcgis-rest-api
• @types/geojson
• @types/topojson-specification

Thanks