feat(experimental-utils): console.warn on import of experimental-utils

packages/experimental-utils/package.json

@@ -35,6 +35,7 @@
     "postclean": "rimraf dist && rimraf _ts3.4 && rimraf coverage",
     "format": "prettier --write \"./**/*.{ts,mts,cts,tsx,js,mjs,cjs,jsx,json,md,css}\" --ignore-path ../../.prettierignore",
     "lint": "nx lint",
+    "test": "jest",
     "typecheck": "tsc -p tsconfig.json --noEmit"
   },
   "dependencies": {

packages/experimental-utils/src/index.ts

@@ -1,2 +1,8 @@
-// TODO (#4139): Once typescript-eslint hits v7, this package will console.warn to switch...
+/* eslint-disable no-console */
+console.warn(
+  'This package is purely a re-export of `@typescript-eslint/utils`.',
+);
+console.warn(
+  'You should switch to importing from that non-experimental package instead.',
+);
 export * from '@typescript-eslint/utils';

packages/experimental-utils/tests/consoleWarning.test.ts

@@ -0,0 +1,10 @@
+describe('importing', () => {
+  it('should console a warning', () => {
+    const warn = jest.spyOn(console, 'warn').mockImplementation(() => {});
+    require('../src/index');
+    expect(warn).toHaveBeenCalledTimes(2);
+    expect(warn).toHaveBeenLastCalledWith(
+      'You should switch to importing from that non-experimental package instead.',
+    );
+  });
+});