Merge pull request #23 from wordpress-mobile/wp-fork-add-jest-28-support

Add support for Jest 28+

package.json

@@ -1,6 +1,6 @@
 {
   "name": "react-native-reanimated",
-  "version": "2.9.1-wp-2",
+  "version": "2.9.1-wp-3",
   "description": "More powerful alternative to Animated library for React Native.",
   "scripts": {
     "start": "node node_modules/react-native/local-cli/cli.js start",

src/reanimated2/jestUtils.ts

@@ -188,7 +188,23 @@ export const advanceAnimationByFrame = (count) => {
 };
 
 export const setUpTests = (userConfig = {}) => {
-  const expect = require('expect');
+  let expect = global.expect;
+  if (expect === undefined) {
+    const expectModule = require('expect');
+    expect = expectModule;
+    // Starting from Jest 28, "expect" package uses named exports instead of default export.
+    // So, requiring "expect" package doesn't give direct access to "expect" function anymore.
+    // It gives access to the module object instead.
+    // We use this info to detect if the project uses Jest 28 or higher.
+    if (typeof expect === 'object') {
+      const jestGlobals = require('@jest/globals');
+      expect = jestGlobals.expect;
+    }
+    if (expect === undefined || expect.extend === undefined) {
+      expect = expectModule.default;
+    }
+  }
+
   require('setimmediate');
   frameTime = Math.round(1000 / config.fps);