diff --git a/types/leaflet.gridlayer.googlemutant/index.d.ts b/types/leaflet.gridlayer.googlemutant/index.d.ts
index 29a1e69a6b..a9d0c943f4 100644
--- a/types/leaflet.gridlayer.googlemutant/index.d.ts
+++ b/types/leaflet.gridlayer.googlemutant/index.d.ts
@@ -9,7 +9,27 @@ import * as L from 'leaflet';
 declare module 'leaflet' {
     namespace gridLayer {
         interface GoogleMutant extends GridLayer {
-            setElementSize(e: HTMLElement, size: Point): void ;
+            setElementSize(e: HTMLElement, size: Point): void;
+
+            /**
+             * Add additional Google Maps layer.
+             *
+             * https://developers.google.com/maps/documentation/javascript/trafficlayer
+             *
+             * @param googleLayerName such as BicyclingLayer, TrafficLayer, or TransitLayer.
+             * @param options? constructor arguments to pass through to the google layer.
+             * @returns Promise for the native Google Maps Layer instance.
+             */
+            addGoogleLayer(googleLayerName: string, options?: object): Promise<object>;
+
+            /**
+             * Removes Google Maps layer.
+             *
+             *  https://developers.google.com/maps/documentation/javascript/trafficlayer
+             *
+             * @param googleLayerName such as BicyclingLayer, TrafficLayer, or TransitLayer.
+             */
+            removeGoogleLayer(googleLayerName: string): void;
         }
 
         type GoogleMutantType = 'roadmap' | 'satellite' | 'terrain' | 'hybrid';
diff --git a/types/leaflet.gridlayer.googlemutant/leaflet.gridlayer.googlemutant-tests.ts b/types/leaflet.gridlayer.googlemutant/leaflet.gridlayer.googlemutant-tests.ts
index 6bda5d2a5d..8face8c3f8 100644
--- a/types/leaflet.gridlayer.googlemutant/leaflet.gridlayer.googlemutant-tests.ts
+++ b/types/leaflet.gridlayer.googlemutant/leaflet.gridlayer.googlemutant-tests.ts
@@ -3,14 +3,22 @@ import 'leaflet.gridlayer.googlemutant';
 
 const map = L.map('foo');
 
-const roads = L.gridLayer.googleMutant({
-    type: 'roadmap'
-}).addTo(map);
+const roads = L.gridLayer
+    .googleMutant({
+        type: 'roadmap',
+    })
+    .addTo(map);
 
-const styled = L.gridLayer.googleMutant({
-    type: 'satellite',
-    styles: [
-        { elementType: 'labels', stylers: [ { visibility: 'off' } ] },
-        { featureType: 'water' , stylers: [ { color: '#444444'  } ] }
-    ]
-}).addTo(map);
+const styled = L.gridLayer
+    .googleMutant({
+        type: 'satellite',
+        styles: [
+            { elementType: 'labels', stylers: [{ visibility: 'off' }] },
+            { featureType: 'water', stylers: [{ color: '#444444' }] },
+        ],
+    })
+    .addTo(map);
+
+styled.addGoogleLayer('TrafficLayer').then(nativeTrafficLayer => {
+    styled.removeGoogleLayer('TrafficLayer');
+});