migrate to next 15

Signed-off-by: Tilman Vatteroth <git@tilmanvatteroth.de>

frontend/next-env.d.ts

@@ -3,4 +3,4 @@
 /// <reference types="next/navigation-types/compat/navigation" />
 
 // NOTE: This file should not be edited
-// see https://nextjs.org/docs/app/building-your-application/configuring/typescript for more information.
+// see https://nextjs.org/docs/app/api-reference/config/typescript for more information.

frontend/next.config.js

@@ -95,10 +95,7 @@ const rawNextConfig = {
     ])
   },
   output: 'standalone',
-  swcMinify: true,
-  experimental: {
-    outputFileTracingRoot: path.join(__dirname, '../')
-  },
+  outputFileTracingRoot: path.join(__dirname, '../'),
   productionBrowserSourceMaps: true
 }
 const completeNextConfig = withBundleAnalyzer(rawNextConfig)

frontend/package.json

@@ -92,14 +92,14 @@
     "markdown-it-sub": "2.0.0",
     "markdown-it-sup": "2.0.0",
     "mermaid": "11.4.1",
-    "next": "14.2.26",
+    "next": "15.3.1",
     "picocolors": "1.1.1",
-    "react": "18.3.1",
+    "react": "19.1.0",
     "react-bootstrap": "2.10.9",
     "react-bootstrap-icons": "1.11.5",
     "react-bootstrap-typeahead": "6.3.4",
     "react-diff-viewer": "3.1.1",
-    "react-dom": "18.3.1",
+    "react-dom": "19.1.0",
     "react-i18next": "15.1.4",
     "react-redux": "9.1.2",
     "react-use": "17.5.1",
@@ -119,13 +119,13 @@
     "yjs": "13.6.23"
   },
   "devDependencies": {
-    "@next/bundle-analyzer": "14.2.23",
+    "@next/bundle-analyzer": "15.3.1",
     "@testing-library/cypress": "10.0.3",
     "@testing-library/dom": "10.4.0",
     "@testing-library/jest-dom": "6.6.3",
-    "@testing-library/react": "16.0.1",
+    "@testing-library/react": "16.3.0",
     "@testing-library/react-hooks": "8.0.1",
-    "@testing-library/user-event": "14.5.2",
+    "@testing-library/user-event": "14.6.1",
     "@types/d3-graphviz": "2.6.10",
     "@types/diff": "6.0.0",
     "@types/dompurify": "3.0.5",
@@ -136,29 +136,29 @@
     "@types/markdown-it-container": "2.0.10",
     "@types/markdown-it-plantuml": "1.4.5",
     "@types/node": "20.16.15",
-    "@types/react": "18.3.20",
-    "@types/react-dom": "18.3.6",
+    "@types/react": "19.1.2",
+    "@types/react-dom": "19.1.2",
     "@types/ws": "8.5.14",
-    "@typescript-eslint/eslint-plugin": "8.14.0",
-    "@typescript-eslint/parser": "8.14.0",
+    "@typescript-eslint/eslint-plugin": "8.30.1",
+    "@typescript-eslint/parser": "8.30.1",
     "csstype": "3.1.3",
     "cypress": "13.17.0",
     "cypress-commands": "3.0.0",
     "cypress-fill-command": "1.0.2",
     "dotenv-cli": "7.4.4",
-    "eslint": "8.57.1",
-    "eslint-config-next": "14.2.23",
+    "eslint": "9.25.0",
+    "eslint-config-next": "15.3.1",
     "eslint-config-prettier": "9.1.0",
     "eslint-plugin-chai-friendly": "1.0.1",
-    "eslint-plugin-cypress": "4.1.0",
-    "eslint-plugin-jest": "28.9.0",
-    "eslint-plugin-n": "17.13.2",
-    "eslint-plugin-prettier": "5.2.3",
-    "eslint-plugin-promise": "7.1.0",
-    "eslint-plugin-testing-library": "6.4.0",
+    "eslint-plugin-cypress": "4.2.1",
+    "eslint-plugin-jest": "28.11.0",
+    "eslint-plugin-n": "17.17.0",
+    "eslint-plugin-prettier": "5.2.6",
+    "eslint-plugin-promise": "7.2.1",
+    "eslint-plugin-testing-library": "7.1.1",
     "jest": "29.7.0",
     "jest-environment-jsdom": "29.7.0",
-    "prettier": "3.3.3",
+    "prettier": "3.5.3",
     "react-test-renderer": "18.3.1",
     "ts-loader": "9.5.2",
     "ts-mockery": "1.2.0",
@@ -166,5 +166,9 @@
     "typescript": "5.6.3",
     "user-agent-data-types": "0.4.2"
   },
-  "packageManager": "yarn@4.5.3"
+  "packageManager": "yarn@4.5.3",
+  "resolutions": {
+    "@types/react": "19.1.2",
+    "@types/react-dom": "19.1.2"
+  }
 }

frontend/src/app/(editor)/[id]/page.tsx

@@ -9,13 +9,14 @@ import { baseUrlFromEnvExtractor } from '../../../utils/base-url-from-env-extrac
 import { notFound } from 'next/navigation'
 
 interface PageProps {
-  params: { id: string | undefined }
+  params: Promise<{ id: string | undefined }>
 }
 
 /**
  * Redirects the user to the editor if the link is a root level direct link to a version 1 note.
  */
-const DirectLinkFallback = async ({ params }: PageProps) => {
+const DirectLinkFallback = async (props: PageProps) => {
+  const params = await props.params
   const baseUrl = baseUrlFromEnvExtractor.extractBaseUrls().editor
 
   if (params.id === undefined) {

frontend/src/app/(editor)/n/[noteId]/page.tsx

@@ -9,16 +9,17 @@ import { NoteLoadingBoundary } from '../../../../components/common/note-loading-
 import { EditorPageContent } from '../../../../components/editor-page/editor-page-content'
 import { EditorToRendererCommunicatorContextProvider } from '../../../../components/editor-page/render-context/editor-to-renderer-communicator-context-provider'
 import type { NextPage } from 'next'
-import React from 'react'
+import React, { use } from 'react'
 
 interface PageParams {
-  params: NoteIdProps
+  params: Promise<NoteIdProps>
 }
 
 /**
  * Renders a page that is used by the user to edit markdown notes. It contains the editor and a renderer.
  */
-const EditorPage: NextPage<PageParams> = ({ params }) => {
+const EditorPage: NextPage<PageParams> = (props: PageParams) => {
+  const params = use(props.params)
   return (
     <NoteLoadingBoundary noteId={params.noteId}>
       <EditorToRendererCommunicatorContextProvider>

frontend/src/app/(editor)/p/[noteId]/page.tsx

@@ -11,16 +11,17 @@ import { useNoteAndAppTitle } from '../../../../components/editor-page/head-meta
 import { EditorToRendererCommunicatorContextProvider } from '../../../../components/editor-page/render-context/editor-to-renderer-communicator-context-provider'
 import { SlideShowPageContent } from '../../../../components/slide-show-page/slide-show-page-content'
 import type { NextPage } from 'next'
-import React from 'react'
+import React, { use } from 'react'
 
 interface PageParams {
-  params: NoteIdProps
+  params: Promise<NoteIdProps>
 }
 
 /**
  * Renders a page that is used by the user to hold a presentation. It contains the renderer for the presentation.
  */
-const SlideShowPage: NextPage<PageParams> = ({ params }) => {
+const SlideShowPage: NextPage<PageParams> = (props) => {
+  const params = use(props.params)
   useNoteAndAppTitle()
 
   return (

frontend/src/app/(editor)/s/[noteId]/page.tsx

@@ -10,16 +10,17 @@ import { DocumentReadOnlyPageContent } from '../../../../components/document-rea
 import { useNoteAndAppTitle } from '../../../../components/editor-page/head-meta-properties/use-note-and-app-title'
 import { EditorToRendererCommunicatorContextProvider } from '../../../../components/editor-page/render-context/editor-to-renderer-communicator-context-provider'
 import type { NextPage } from 'next'
-import React from 'react'
+import React, { use } from 'react'
 
 interface PageParams {
-  params: NoteIdProps
+  params: Promise<NoteIdProps>
 }
 
 /**
  * Renders a page that contains only the rendered document without an editor or realtime updates.
  */
-const DocumentReadOnlyPage: NextPage<PageParams> = ({ params }) => {
+const DocumentReadOnlyPage: NextPage<PageParams> = (props) => {
+  const params = use(props.params)
   useNoteAndAppTitle()
 
   return (

frontend/src/components/application-loader/loading-screen/random-icon.tsx

@@ -4,7 +4,7 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 import styles from './animations.module.scss'
-import React, { Fragment, useEffect, useState } from 'react'
+import React, { Fragment, useEffect, useState, type JSX } from 'react'
 import type { Icon } from 'react-bootstrap-icons'
 import {
   File as IconFile,

frontend/src/components/common/copyable/hooks/use-copy-overlay.tsx

@@ -27,7 +27,7 @@ enum SHOW_STATE {
  * @return the copy function and the overlay
  */
 export const useCopyOverlay = (
-  clickComponent: RefObject<HTMLElement>,
+  clickComponent: RefObject<HTMLElement | null>,
   content: string
 ): [copyToCliphoard: () => void, overlayElement: ReactElement] => {
   useTranslation()

frontend/src/components/common/renderer-iframe/hooks/use-force-render-page-url-on-iframe-load-callback.ts

@@ -19,7 +19,7 @@ const log = new Logger('IframeLoader')
  * @param onNavigateAway An optional callback that is executed when the iframe leaves the enforced URL.
  */
 export const useForceRenderPageUrlOnIframeLoadCallback = (
-  iFrameReference: RefObject<HTMLIFrameElement>,
+  iFrameReference: RefObject<HTMLIFrameElement | null>,
   onNavigateAway: () => void
 ): (() => void) => {
   const iframeCommunicator = useEditorToRendererCommunicator()

frontend/src/components/editor-page/editor-pane/hooks/use-apply-scroll-state.ts

@@ -36,7 +36,7 @@ const applyScrollState = (view: EditorView, scrollState: ScrollState): void => {
  * @param scrollState The scroll state that should be monitored
  */
 export const useApplyScrollState = (scrollState: ScrollState | null): void => {
-  const lastScrollPosition = useRef<ScrollState>()
+  const lastScrollPosition = useRef<ScrollState>(undefined)
   const [codeMirrorRef] = useCodemirrorReferenceContext()
 
   useEffect(() => {

frontend/src/components/editor-page/editor-pane/hooks/use-cursor-activity-callback.ts

@@ -15,7 +15,7 @@ import { useMemo, useRef } from 'react'
  * @return the generated callback
  */
 export const useCursorActivityCallback = (): Extension => {
-  const lastMainSelection = useRef<SelectionRange>()
+  const lastMainSelection = useRef<SelectionRange>(undefined)
 
   return useMemo(
     () =>

frontend/src/components/editor-page/editor-pane/hooks/use-disconnect-on-user-login-status-change.ts

@@ -13,7 +13,7 @@ import { useEffect, useRef } from 'react'
  * @param messageTransporter the message transporter to disconnect
  */
 export const useDisconnectOnUserLoginStatusChange = (messageTransporter: MessageTransporter): void => {
-  const previousIsLoggedIn = useRef<boolean | undefined>()
+  const previousIsLoggedIn = useRef<boolean | undefined>(undefined)
   const isLoggedIn = useApplicationState((state) => state.user !== null)
   useEffect(() => {
     if (previousIsLoggedIn.current === undefined) {

frontend/src/components/editor-page/editor-pane/tool-bar/emoji-picker/emoji-picker-popover.tsx

@@ -40,7 +40,7 @@ export const EmojiPickerPopover = React.forwardRef<HTMLDivElement, EmojiPickerPr
   ({ onEmojiSelected, ...props }, ref) => {
     const darkModeEnabled = useDarkModeState()
     const pickerContainerRef = useRef<HTMLDivElement>(null)
-    const pickerRef = useRef<Picker>()
+    const pickerRef = useRef<Picker>(undefined)
 
     useEffect(() => {
       if (!pickerContainerRef.current) {

frontend/src/components/editor-page/editor-pane/tool-bar/toolbar-button.tsx

@@ -16,7 +16,7 @@ export interface ToolbarButtonProps {
   icon: Icon
   onClick: () => void
   disabled?: boolean
-  buttonRef?: RefObject<HTMLButtonElement>
+  buttonRef?: RefObject<HTMLButtonElement | null>
 }
 
 /**

frontend/src/components/editor-page/editor-pane/tool-bar/upload-image-button/upload-image-button.tsx

@@ -21,7 +21,7 @@ const logger = new Logger('Upload image button')
  * Shows a button that uploads a chosen file to the backend and adds the link to the note.
  */
 export const UploadImageButton: React.FC = () => {
-  const clickRef = useRef<() => void>()
+  const clickRef = useRef<() => void>(undefined)
   const buttonClick = useCallback(() => {
     clickRef.current?.()
   }, [])

frontend/src/components/editor-page/hooks/use-scroll-state.ts

@@ -20,7 +20,7 @@ const log = new Logger('useScrollState')
  * @return the created scroll state and the update function. The update function accepts only new values if the given scroll source isn't active to prevent callback loops.
  */
 export const useScrollState = (
-  scrollSourceRef: RefObject<ScrollSource>,
+  scrollSourceRef: RefObject<ScrollSource | null>,
   scrollSource: ScrollSource
 ): [scrollState: ScrollState, onScroll: (newScrollState: ScrollState) => void] => {
   const editorSyncScroll: boolean = useApplicationState((state) => state.editorConfig.syncScroll)

frontend/src/components/editor-page/sidebar/specific-sidebar-entries/import-markdown-sidebar-entry.tsx

@@ -39,7 +39,7 @@ export const ImportMarkdownSidebarEntry: React.FC = () => {
     [changeEditorContent]
   )
 
-  const clickRef = useRef<() => void>()
+  const clickRef = useRef<() => void>(undefined)
   const buttonClick = useCallback(() => {
     clickRef.current?.()
   }, [])

frontend/src/components/editor-page/sidebar/types.ts

@@ -15,7 +15,7 @@ export interface SpecificSidebarEntryProps {
 
 export interface SidebarEntryProps extends PropsWithDataCypressId {
   icon?: Icon
-  buttonRef?: RefObject<HTMLButtonElement>
+  buttonRef?: RefObject<HTMLButtonElement | null>
   hide?: boolean
   className?: string
   onClick?: () => void

frontend/src/components/layout/expected-origin-boundary.tsx

@@ -3,7 +3,7 @@
  *
  * SPDX-License-Identifier: AGPL-3.0-only
  */
-import { headers } from 'next/headers'
+import { headers, type UnsafeUnwrappedHeaders } from 'next/headers'
 import type { PropsWithChildren } from 'react'
 import React from 'react'
 
@@ -17,7 +17,7 @@ export interface ExpectedOriginBoundaryProps extends PropsWithChildren {
  * @return the calculated request origin or {@code undefined} if no host header has been found
  */
 export const buildOriginFromHeaders = (): string | undefined => {
-  const currentHeader = headers()
+  const currentHeader = headers() as unknown as UnsafeUnwrappedHeaders
   const host = currentHeader.get('x-forwarded-host') ?? currentHeader.get('host')
   if (host === null) {
     return undefined

frontend/src/components/markdown-renderer/extensions/link-replacer/anchor-node-preprocessor.ts

@@ -22,7 +22,6 @@ export class AnchorNodePreprocessor extends TravelerNodeProcessor {
 
     const url = node.attribs.href.trim()
 
-    // eslint-disable-next-line no-script-url
     if (url.startsWith('data:') || url.startsWith('javascript:') || url.startsWith('vbscript:')) {
       delete node.attribs.href
       return

frontend/src/components/markdown-renderer/hooks/use-calculate-line-marker-positions.ts

@@ -54,11 +54,11 @@ const calculateLineMarkerPositions = (
  * @param onLineMarkerPositionChanged The callback to call if the {@link LineMarkerPosition line marker positions} change e.g. by rendering or resizing.
  */
 export const useCalculateLineMarkerPosition = (
-  documentElement: RefObject<HTMLDivElement>,
+  documentElement: RefObject<HTMLDivElement | null>,
   lineMarkers: LineMarkers[] | undefined,
   onLineMarkerPositionChanged?: (lineMarkerPosition: LineMarkerPosition[]) => void
 ): void => {
-  const lastLineMarkerPositions = useRef<LineMarkerPosition[]>()
+  const lastLineMarkerPositions = useRef<LineMarkerPosition[]>(undefined)
 
   const calculateNewLineMarkerPositions = useCallback(() => {
     if (!documentElement.current || !onLineMarkerPositionChanged || !lineMarkers) {

frontend/src/components/markdown-renderer/hooks/use-on-ref-change.ts

@@ -14,7 +14,7 @@ import { useEffect, useRef } from 'react'
  * @param onChange The callback to call if something changes
  */
 export const useOnRefChange = <T>(reference: MutableRefObject<T>, onChange?: (newValue: T) => void): void => {
-  const lastValue = useRef<T>()
+  const lastValue = useRef<T>(undefined)
   useEffect(() => {
     if (onChange && !equal(reference.current, lastValue.current)) {
       lastValue.current = reference.current

frontend/src/components/render-page/hooks/sync-scroll/use-document-sync-scrolling.ts

@@ -23,8 +23,8 @@ import { useCallback, useMemo, useState } from 'react'
  *         The second one should be executed if the user actually scrolls. Usually it should be attached to the DOM element that the user scrolls.
  */
 export const useDocumentSyncScrolling = (
-  outerContainerRef: React.RefObject<HTMLElement>,
-  rendererRef: React.RefObject<HTMLElement>,
+  outerContainerRef: React.RefObject<HTMLElement | null>,
+  rendererRef: React.RefObject<HTMLElement | null>,
   numberOfLines: number,
   scrollState: ScrollState | null,
   onScroll: null | ((scrollState: ScrollState) => void)

frontend/src/components/render-page/hooks/sync-scroll/use-on-user-scroll.ts

@@ -18,7 +18,7 @@ import { useCallback } from 'react'
  */
 export const useOnUserScroll = (
   lineMarks: LineMarkerPosition[] | undefined,
-  scrollContainer: React.RefObject<HTMLElement>,
+  scrollContainer: React.RefObject<HTMLElement | null>,
   onScroll: ((newScrollState: ScrollState) => void) | null
 ): React.UIEventHandler<HTMLElement> => {
   return useCallback(() => {

frontend/src/components/render-page/hooks/sync-scroll/use-scroll-to-line-mark.ts

@@ -21,9 +21,9 @@ export const useScrollToLineMark = (
   scrollState: ScrollState | null,
   lineMarks: LineMarkerPosition[],
   contentLineCount: number,
-  scrollContainer: RefObject<HTMLElement>
+  scrollContainer: RefObject<HTMLElement | null>
 ): void => {
-  const lastScrollPosition = useRef<number>()
+  const lastScrollPosition = useRef<number>(undefined)
 
   const scrollTo = useCallback(
     (targetPosition: number): void => {

frontend/src/components/render-page/hooks/use-on-height-change.ts

@@ -14,7 +14,7 @@ import { useEffect, useRef, useState } from 'react'
  * @param onHeightChange The callback that should be executed if the height changes
  */
 export const useOnHeightChange = (
-  elementRef: RefObject<HTMLElement>,
+  elementRef: RefObject<HTMLElement | null>,
   onHeightChange: undefined | ((value: number) => void)
 ): void => {
   const [rendererSize, setRendererSize] = useState<number>(0)

frontend/src/components/render-page/renderers/document/document-markdown-renderer.tsx

@@ -62,7 +62,7 @@ export const DocumentMarkdownRenderer: React.FC<DocumentMarkdownRendererProps> =
   )
 
   const markdownBodyRef = useRef<HTMLDivElement>(null)
-  const currentLineMarkers = useRef<LineMarkers[]>()
+  const currentLineMarkers = useRef<LineMarkers[]>(undefined)
 
   const extensions = useMarkdownExtensions(
     baseUrl,

frontend/src/extensions/external-lib-app-extensions/vimeo/vimeo-frame.tsx

@@ -10,7 +10,7 @@ import { Vimeo as IconVimeo } from 'react-bootstrap-icons'
 
 interface VimeoApiResponse {
   // Vimeo uses strange names for their fields. ESLint doesn't like that.
-  // eslint-disable-next-line camelcase
+
   thumbnail_large?: string
 }