Use import VueNgwMap from '@nextgis/vue-ngw-leaflet' instead of @nextgis/vue-ngw-map, vue-ngw-map is now has only abstract class for export (without any map framework). Also you can importVueNgwMap component from @nextgis/vue-ngw-mapbox and @nextgis/vue-ngw-ol.
Use import VueNgwMap from '@nextgis/vue-ngw-leaflet' instead of @nextgis/vue-ngw-map, vue-ngw-map is now has only abstract class for export (without any map framework). Also you can importVueNgwMap component from @nextgis/vue-ngw-mapbox and @nextgis/vue-ngw-ol.