Include featuresets in Style#serialize output (internal-8828)

GitOrigin-RevId: ff8ab5ecda95d2494b6c4c87421ac748cd6ca963

Author: stepankuzmin

src/style/style.ts

@@ -3215,6 +3215,7 @@ class Style extends Evented<MapEvents> {
             metadata: this.stylesheet.metadata,
             fragment: this.stylesheet.fragment,
             iconsets: this.stylesheet.iconsets,
+            featuresets: this.stylesheet.featuresets,
             imports: this._serializeImports(),
             schema: this.stylesheet.schema,
             camera: this.stylesheet.camera,

test/unit/style/style_imports.test.ts

@@ -3339,7 +3339,8 @@ test('Style#serialize', async () => {
         sources: {'mapbox-dem': {type: 'raster-dem', tiles: ['http://example.com/{z}/{x}/{y}.png']}},
         terrain: {source: 'mapbox-dem', exaggeration: 1.5},
         projection: {name: 'globe'},
-        transition: {duration: 900, delay: 200}
+        transition: {duration: 900, delay: 200},
+        featuresets: {'test-featureset': {selectors: [{layer: 'background'}]}}
     });
 
     // eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
@@ -3359,6 +3360,7 @@ test('Style#serialize', async () => {
             expect(serialized.terrain).toBeFalsy();
             expect(serialized.projection).toBeFalsy();
             expect(serialized.transition).toBeFalsy();
+            expect(serialized.featuresets).toBeFalsy();
             expect(serialized.sources).toEqual({});
 
             resolve();

test/unit/ui/map/getStyle.test.ts

@@ -174,4 +174,22 @@ describe('Map#getStyle', () => {
         map.setStyle(style, {diff: false});
         expect(map.style && map.style !== previousStyle).toBeTruthy();
     });
+
+    test('returns the style with featuresets', async () => {
+        const style = createStyle();
+        style['featuresets'] = {
+            'my-featureset': {
+                'selectors': [{'layer': 'background'}]
+            }
+        };
+        style['layers'] = [{'id': 'background', 'type': 'background'}];
+        const map = createMap({style});
+
+        await waitFor(map, 'load');
+        expect(map.getStyle().featuresets).toEqual({
+            'my-featureset': {
+                'selectors': [{'layer': 'background'}]
+            }
+        });
+    });
 });