Upgrade packages and Node versions. (trekhleb#989)

* Upgrade to Node 16

* Upgrade packages and Node versions.

.eslintrc

@@ -14,7 +14,7 @@
   },
   "settings": {
     "react": {
-      "version": "latest"
+      "version": "18.2.0"
     }
   }
 }

.github/workflows/CI.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-version: [ 14.x ]
+        node-version: [ 16.x ]
 
     steps:
       - name: Checkout repository

.nvmrc

@@ -1 +1 @@
-v14
+v16.15.0

README.md

@@ -287,7 +287,7 @@ rm -rf ./node_modules
 npm i
 ```
 
-Also make sure that you're using a correct Node version (`>=14.16.0`). If you're using [nvm](https://github.com/nvm-sh/nvm) for Node version management you may run `nvm use` from the root folder of the project and the correct version will be picked up.
+Also make sure that you're using a correct Node version (`>=16`). If you're using [nvm](https://github.com/nvm-sh/nvm) for Node version management you may run `nvm use` from the root folder of the project and the correct version will be picked up.
 
 **Playground**
 

jest.config.js

@@ -24,7 +24,9 @@ module.exports = {
   // This option sets the URL for the jsdom environment.
   // It is reflected in properties such as location.href.
   // @see: https://github.com/facebook/jest/issues/6769
-  testURL: 'http://localhost/',
+  testEnvironmentOptions: {
+    url: 'http://localhost/',
+  },
 
   // @see: https://jestjs.io/docs/en/configuration#coveragethreshold-object
   coverageThreshold: {