69: Upgrade dependencies

Author: steffenkleinle

.eslintrc.json

@@ -5,7 +5,8 @@
     "eslint:recommended",
     "plugin:@typescript-eslint/recommended",
     "plugin:react/recommended",
-    "plugin:jest/recommended"
+    "plugin:jest/recommended",
+    "prettier"
   ],
   "settings": {
     "react": {
@@ -15,9 +16,5 @@
   "env": {
     "node": true,
     "browser": true
-  },
-  "rules": {
-    "comma-dangle": "off",
-    "space-before-function-paren": "off"
   }
 }

.stylelintrc

@@ -1,5 +1,5 @@
-import ReactDOM from 'react-dom'
 import React from 'react'
+import { createRoot } from 'react-dom/client'
 import StickyHeadroom from '../src/Headroom'
 import styled from 'styled-components'
 import CITIES from './cities'
@@ -120,6 +120,10 @@ class Demo extends React.PureComponent<Record<string, never>, { stickyTop: numbe
 }
 
 const container = document.getElementById('react-container')
-if (container) {
-  ReactDOM.render(<Demo />, container)
+
+if (container == null) {
+  throw new Error("Couldn't find element with id container.")
 }
+
+const root = createRoot(container)
+root.render(<Demo />)