Fix: Upgrade to react 18 (#159)

## Summary
1. Updates React SDK to use React 18 and fixed related typescript issues.
2. Replaces `enzyme` with `react testing library` to make unit tests work with React 18.

## Test Plan
- Updated many unit tests to use React Testing Library instead of Enzyme.
- E2E Tests also Pass.

Author: shaharyar123

.github/workflows/react.yml

@@ -13,10 +13,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v3
-    - name: Set up Node 10
+    - name: Set up Node 16
       uses: actions/setup-node@v3
       with:
-        node-version: 10
+        node-version: 16
     - run: yarn install
     - run: yarn test
 

CHANGELOG.md

@@ -10,6 +10,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ### Bug fixes
 - addresses issues [#152](https://github.com/optimizely/react-sdk/issues/152) and [#134](https://github.com/optimizely/react-sdk/issues/134): Gracefully returns pessimistic default values when hooks fail instead of throwing an error.
 - fixed issue [#156](https://github.com/optimizely/react-sdk/issues/156) - Added children prop to make the SDK compatible with React 18([#158](https://github.com/optimizely/react-sdk/pull/158)).
+- Updates React SDK to use React 18 and fixed related typescript issues ([#159](https://github.com/optimizely/react-sdk/pull/159)).
+- Replaces `enzyme` with `react testing library` to make unit tests work with React 18 ([#159](https://github.com/optimizely/react-sdk/pull/159)).
 
 ## [2.8.1] - March 7, 2022
 

package.json

@@ -42,26 +42,24 @@
     "@rollup/plugin-commonjs": "^16.0.0",
     "@rollup/plugin-node-resolve": "^10.0.0",
     "@rollup/plugin-replace": "^2.3.4",
-    "@types/enzyme": "^3.1.15",
-    "@types/enzyme-adapter-react-16": "^1.0.3",
+    "@testing-library/jest-dom": "^5.16.4",
+    "@testing-library/react": "^13.1.1",
     "@types/hoist-non-react-statics": "^3.3.1",
     "@types/jest": "^26.0.14",
     "@types/prop-types": "^15.5.6",
-    "@types/react": "^16.7.18",
-    "@types/react-dom": "^16.9.5",
+    "@types/react": "^18.0.6",
+    "@types/react-dom": "^18.0.2",
     "@typescript-eslint/eslint-plugin": "^2.23.0",
     "@typescript-eslint/parser": "^2.23.0",
-    "enzyme": "^3.8.0",
-    "enzyme-adapter-react-16": "^1.7.1",
     "eslint": "^6.8.0",
     "eslint-config-prettier": "^6.10.0",
     "eslint-plugin-prettier": "^3.1.2",
     "eslint-plugin-react": "^7.19.0",
     "eslint-plugin-react-hooks": "^4.1.0",
     "jest": "^26.5.2",
     "prettier": "1.19.1",
-    "react": "^16.8.0",
-    "react-dom": "^16.8.0",
+    "react": "^18.0.0",
+    "react-dom": "^18.0.0",
     "rollup": "^2.32.1",
     "rollup-plugin-typescript2": "^0.28.0",
     "rollup-plugin-uglify": "^6.0.4",