Upgrade dependencies

.prettierrc

@@ -5,5 +5,6 @@
   "singleQuote": true,
   "trailingComma": "es5",
   "arrowParens": "avoid",
-  "quoteProps": "consistent"
-}
+  "quoteProps": "consistent",
+  "plugins": ["prettier-plugin-organize-imports"]
+}

package.json

@@ -7,29 +7,30 @@
     "copy-to-clipboard": "^3.3.3",
     "history": "^5.3.0",
     "local-storage": "^2.0.0",
-    "monaco-editor": "^0.51.0",
+    "monaco-editor": "^0.52.0",
     "monaco-themes": "^0.4.4",
     "pako": "^2.1.0",
-    "react": "^18.2.0",
+    "react": "^19.0.0",
     "react-device-detect": "^2.2.3",
-    "react-dom": "^18.2.0",
+    "react-dom": "^19.0.0",
     "react-scripts": "^5.0.1",
-    "styled-components": "^6.1.1",
-    "typescript": "^4.4.2",
+    "styled-components": "^6.1.13",
+    "typescript": "^5.7.2",
     "whatwg-mimetype": "^3.0.0"
   },
   "devDependencies": {
+    "@testing-library/dom": "^10.4.0",
     "@testing-library/jest-dom": "^5.14.1",
-    "@testing-library/react": "^13.0.0",
+    "@testing-library/react": "^16.1.0",
     "@testing-library/user-event": "^13.2.1",
     "@types/jest": "^27.0.1",
     "@types/node": "^18.11.9",
     "@types/pako": "^2.0.3",
-    "@types/react": "^18.2.0",
-    "@types/react-dom": "^18.2.0",
+    "@types/react": "^19.0.0",
+    "@types/react-dom": "^19.0.0",
     "@types/whatwg-mimetype": "^3.0.2",
-    "prettier": "^3.1.0",
-    "prettier-plugin-organize-imports": "^3.2.4"
+    "prettier": "^3.4.2",
+    "prettier-plugin-organize-imports": "^4.1.0"
   },
   "scripts": {
     "start": "react-scripts start",

src/components/Editor.tsx

@@ -27,7 +27,7 @@ export default function Editor({
 }: EditorProps) {
   const [language, setLanguage] = useState<string>('plain');
   const [readOnly, setReadOnly] = useState<boolean>(isMobile && !!pasteId);
-  const resetFunction = useRef<ResetFunction>();
+  const resetFunction = useRef<ResetFunction>(null);
 
   const [theme, setTheme] = usePreference<keyof Themes>(
     'theme',

src/components/EditorControls.tsx

@@ -1,6 +1,6 @@
 import copy from 'copy-to-clipboard';
 import history from 'history/browser';
-import { MutableRefObject, useCallback, useEffect, useState } from 'react';
+import { RefObject, useCallback, useEffect, useState } from 'react';
 import styled from 'styled-components';
 
 import themes, { Themes } from '../style/themes';
@@ -12,7 +12,7 @@ import MenuButton from './MenuButton';
 
 export interface EditorControlsProps {
   actualContent: string;
-  resetFunction: MutableRefObject<ResetFunction | undefined>;
+  resetFunction: RefObject<ResetFunction | null>;
   language: string;
   setLanguage: (value: string) => void;
   readOnly: boolean;

src/components/EditorTextArea.tsx

@@ -5,23 +5,17 @@ import Editor, {
   OnMount,
 } from '@monaco-editor/react';
 import history from 'history/browser';
-import React, {
-  MutableRefObject,
-  useCallback,
-  useEffect,
-  useRef,
-  useState,
-} from 'react';
+import { RefObject, useCallback, useEffect, useRef, useState } from 'react';
 import styled from 'styled-components';
 import themes, { Theme } from '../style/themes';
 
 import type { editor } from 'monaco-editor';
-import { ResetFunction } from './Editor';
-import { logLanguage } from '../util/languages/log';
 import { diffLanguage } from '../util/languages/diff';
+import { logLanguage } from '../util/languages/log';
+import { ResetFunction } from './Editor';
 
-import * as monaco from 'monaco-editor';
 import { loader } from '@monaco-editor/react';
+import * as monaco from 'monaco-editor';
 
 loader.config({ monaco });
 
@@ -33,7 +27,7 @@ export interface EditorTextAreaProps {
   language: string;
   fontSize: number;
   readOnly: boolean;
-  resetFunction: MutableRefObject<ResetFunction | undefined>;
+  resetFunction: RefObject<ResetFunction | null>;
 }
 
 export default function EditorTextArea({
@@ -254,7 +248,7 @@ function useSelectedLine(): [SelectedLine, ToggleSelectedFunction] {
 }
 
 function useLineNumberMagic(
-  editorAreaRef: React.RefObject<HTMLDivElement>,
+  editorAreaRef: RefObject<HTMLDivElement | null>,
   selected: SelectedLine,
   toggleSelected: ToggleSelectedFunction,
   forcedContent: string,