Upgrade to vitest 4 (#1951)

* chore: upgrade to vitest 4

* test: refactor ResizeObserver mock implementation in AnnotationLabel tests

Author: hshoff

package.json

@@ -81,9 +81,9 @@
     "@types/react-dom": "18.3.7",
     "@typescript-eslint/eslint-plugin": "^8.18.1",
     "@typescript-eslint/parser": "^8.18.1",
-    "@vitest/coverage-v8": "3",
+    "@vitest/coverage-v8": "4",
     "@vitest/eslint-plugin": "^1.4.0",
-    "@vitest/ui": "3",
+    "@vitest/ui": "4",
     "airbnb-js-shims": "^2.2.1",
     "babel-plugin-typescript-to-proptypes": "^2.0.0",
     "chalk": "4.1.0",
@@ -109,7 +109,7 @@
     "timezone-mock": "^1.1.0",
     "ts-node": "^10.9.1",
     "typescript": "^5.7.0",
-    "vitest": "3"
+    "vitest": "4"
   },
   "packageManager": "yarn@1.22.19",
   "workspaces": {

packages/visx-xychart/test/components/AnnotationLabel.test.tsx

@@ -7,11 +7,11 @@ import { AnnotationLabel } from '../../src';
 import { addMock, removeMock } from '../mocks/svgMock';
 
 // Mock ResizeObserver
-const mockResizeObserver = vi.fn().mockImplementation(() => ({
-  observe: vi.fn(),
-  unobserve: vi.fn(),
-  disconnect: vi.fn(),
-}));
+class MockResizeObserver {
+  observe = vi.fn();
+  unobserve = vi.fn();
+  disconnect = vi.fn();
+}
 
 describe('<AnnotationLabel />', () => {
   const defaultProps = {
@@ -24,7 +24,7 @@ describe('<AnnotationLabel />', () => {
 
   beforeAll(() => {
     // Add ResizeObserver mock
-    vi.stubGlobal('ResizeObserver', mockResizeObserver);
+    vi.stubGlobal('ResizeObserver', MockResizeObserver);
     addMock();
   });