Fix eslint warnings

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

js/src/@types/dom.d.ts

@@ -0,0 +1,18 @@
+declare global {
+  interface GeolocationCoordinates {
+    readonly accuracy: number;
+    readonly altitude: number | null;
+    readonly altitudeAccuracy: number | null;
+    readonly heading: number | null;
+    readonly latitude: number;
+    readonly longitude: number;
+    readonly speed: number | null;
+  }
+
+  interface GeolocationPosition {
+    readonly coords: GeolocationCoordinates;
+    readonly timestamp: number;
+  }
+}
+
+export {};