Allow users to set preserveDrawingBuffer in the options

README.md

@@ -128,6 +128,10 @@ L.esri.Vector.vectorTileLayer("SERVICE_URL", {
   // (this may not be necessary when specifying a SERVICE_URL)
   portalUrl: "https://www.arcgis.com", // default value
 
+  // optional: set by default to `false` for performance reasons
+  // set to `true` to resolve WebGL printing issues in Firefox
+  preserveDrawingBuffer: false, // default value
+
   // optional: customize the style with a function that gets the default style from the service
   // and returns the new style to be used
   style: (style) => {

src/VectorTileLayer.js

@@ -5,7 +5,10 @@ import { maplibreGLJSLayer } from './MaplibreGLLayer';
 export var VectorTileLayer = Layer.extend({
   options: {
     // if portalUrl is not provided, default to ArcGIS Online
-    portalUrl: 'https://www.arcgis.com'
+    portalUrl: 'https://www.arcgis.com',
+    // for performance optimization default to `false`
+    // set to `true` to resolve printing issues in Firefox
+    preserveDrawingBuffer: false
   },
 
   /**
@@ -100,7 +103,8 @@ export var VectorTileLayer = Layer.extend({
     this._maplibreGL = maplibreGLJSLayer({
       style: style,
       pane: this.options.pane,
-      opacity: this.options.opacity
+      opacity: this.options.opacity,
+      preserveDrawingBuffer: this.options.preserveDrawingBuffer
     });
 
     this._ready = true;