Disconnect resize observer before destroying component

Author: IvanSafonov

src/listscroller.vue

@@ -298,5 +298,9 @@ export default {
     this.observer = new ResizeObserver(this.onItemsResize)
     this.setStart(0)
   },
+
+  beforeDestroy() {
+    this.observer.disconnect()
+  },
 }
 </script>

tests/listscroller.test.js

@@ -99,6 +99,7 @@ describe('ListScroller component', () => {
         'resize',
         window.addEventListener.mock.calls[1][1],
       )
+      expect(ResizeObserver.mock.instances[0].disconnect).toBeCalledTimes(1)
     })
 
     it('passes data and index to item component', () => {

tests/resizeobserver.js

@@ -1,4 +1,5 @@
 export default class ResizeObserver {
   observe() {}
   unobserve() {}
+  disconnect() {}
 }