This sample demonstrates how to add two separate basemap layers to a map. Common basemap combinations such as arcgis/imagery, an imagery layer with labels, are available from the ArcGIS Basemap Styles service.
In Esri Leaflet Vector, basemaps are added to panes via the following method:
- Basemap enums ending in 
/labels, such asarcgis/imagery/labels, are added to theesri-labelspane. - Basemap enums ending in 
/detail, such asarcgis/human-geography/detail, are added to theesri-detailpane. - Basemaps are added to the 
tileby default.Pane  
To learn more, go to the API reference.
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <title>Add two basemap layers</title>
    <meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no">
    <link rel="stylesheet" href="https://unpkg.com/leaflet@1.9.4/dist/leaflet.css" crossorigin="">
    <script src="https://unpkg.com/leaflet@1.9.4/dist/leaflet.js" crossorigin=""></script>
    <!-- Load Esri Leaflet from CDN -->
    <script src="https://unpkg.com/esri-leaflet@3.0.19/dist/esri-leaflet.js"></script>
    <!-- Load Esri Leaflet Vector from CDN -->
    <script src="https://unpkg.com/esri-leaflet-vector@4.3.2/dist/esri-leaflet-vector.js" crossorigin=""></script>
    <style>
      html,
      body,
      #map {
        padding: 0;
        margin: 0;
        height: 100%;
        width: 100%;
        font-family: Arial, Helvetica, sans-serif;
        font-size: 14px;
        color: #323232;
      }
    </style>
  </head>
  <body>
    <div id="map"></div>
    <script>
      const accessToken = "YOUR_ACCESS_TOKEN";
      const map = L.map("map").setView([-6.17742, 106.828308], 10);
      L.esri.Vector.vectorBasemapLayer("arcgis/dark-gray/base", {
        token: accessToken
      }).addTo(map);
      L.esri.Vector.vectorBasemapLayer("arcgis/dark-gray/labels", {
        token: accessToken
      }).addTo(map);
    </script>
  </body>
</html>