Upgrade to React 19, Next 15.1 and enable React Compiler (#6996)

Co-authored-by: Sebastian Markbåge <sebastian@calyptus.eu>
Co-authored-by: Rick Hanlon <rickhanlonii@fb.com>
Co-authored-by: eps1lon <sebastian.silbermann@vercel.com>

Author: 4 people

.eslintrc

@@ -6,7 +6,8 @@
   "rules": {
     "no-unused-vars": "off",
     "@typescript-eslint/no-unused-vars": ["error", { "varsIgnorePattern": "^_" }],
-    "react-hooks/exhaustive-deps": "error"
+    "react-hooks/exhaustive-deps": "error",
+    "react/no-unknown-property": ["error", { "ignore": ["meta"] }]
   },
   "env": {
     "node": true,

next-env.d.ts

@@ -2,4 +2,4 @@
 /// <reference types="next/image-types/global" />
 
 // NOTE: This file should not be edited
-// see https://nextjs.org/docs/basic-features/typescript for more information.
+// see https://nextjs.org/docs/pages/api-reference/config/typescript for more information.

next.config.js

@@ -9,10 +9,8 @@ const nextConfig = {
   pageExtensions: ['jsx', 'js', 'ts', 'tsx', 'mdx', 'md'],
   reactStrictMode: true,
   experimental: {
-    // TODO: Remove after https://github.com/vercel/next.js/issues/49355 is fixed
-    appDir: false,
     scrollRestoration: true,
-    legacyBrowsers: false,
+    reactCompiler: true,
   },
   env: {},
   webpack: (config, {dev, isServer, ...options}) => {

package.json

@@ -18,7 +18,7 @@
     "ci-check": "npm-run-all prettier:diff --parallel lint tsc lint-heading-ids rss",
     "tsc": "tsc --noEmit",
     "start": "next start",
-    "postinstall": "patch-package && (is-ci || husky install .husky)",
+    "postinstall": "is-ci || husky install .husky",
     "check-all": "npm-run-all prettier lint:fix tsc rss",
     "rss": "node scripts/generateRss.js"
   },
@@ -28,17 +28,18 @@
     "@docsearch/react": "^3.6.1",
     "@headlessui/react": "^1.7.0",
     "@radix-ui/react-context-menu": "^2.1.5",
+    "babel-plugin-react-compiler": "0.0.0-experimental-696af53-20240625",
     "body-scroll-lock": "^3.1.3",
     "classnames": "^2.2.6",
     "date-fns": "^2.16.1",
     "debounce": "^1.2.1",
     "github-slugger": "^1.3.0",
-    "next": "^13.4.1",
+    "next": "15.1.0",
     "next-remote-watch": "^1.0.0",
     "parse-numeric-range": "^1.2.0",
-    "react": "^0.0.0-experimental-16d053d59-20230506",
+    "react": "^19.0.0",
     "react-collapsed": "4.0.4",
-    "react-dom": "^0.0.0-experimental-16d053d59-20230506",
+    "react-dom": "^19.0.0",
     "remark-frontmatter": "^4.0.1",
     "remark-gfm": "^3.0.1"
   },
@@ -54,8 +55,8 @@
     "@types/mdx-js__react": "^1.5.2",
     "@types/node": "^14.6.4",
     "@types/parse-numeric-range": "^0.0.1",
-    "@types/react": "^18.0.9",
-    "@types/react-dom": "^18.0.5",
+    "@types/react": "^19.0.0",
+    "@types/react-dom": "^19.0.0",
     "@typescript-eslint/eslint-plugin": "^5.36.2",
     "@typescript-eslint/parser": "^5.36.2",
     "asyncro": "^3.0.0",
@@ -78,7 +79,6 @@
     "mdast-util-to-string": "^1.1.0",
     "metro-cache": "0.72.2",
     "npm-run-all": "^4.1.5",
-    "patch-package": "^6.2.2",
     "postcss": "^8.4.5",
     "postcss-flexbugs-fixes": "4.2.1",
     "postcss-preset-env": "^6.7.0",
@@ -94,7 +94,7 @@
     "retext-smartypants": "^4.0.0",
     "rss": "^1.2.2",
     "tailwindcss": "^3.4.1",
-    "typescript": "^4.0.2",
+    "typescript": "^5.7.2",
     "unist-util-visit": "^2.0.3",
     "webpack-bundle-analyzer": "^4.5.0"
   },

patches/next+13.4.1.patch

@@ -1,13 +1,17 @@
 /*
  * Copyright (c) Facebook, Inc. and its affiliates.
  */
+import type {DetailedHTMLProps, AnchorHTMLAttributes} from 'react';
 
 export function ExternalLink({
   href,
   target,
   children,
   ...props
-}: JSX.IntrinsicElements['a']) {
+}: DetailedHTMLProps<
+  AnchorHTMLAttributes<HTMLAnchorElement>,
+  HTMLAnchorElement
+>) {
   return (
     <a href={href} target={target ?? '_blank'} rel="noopener" {...props}>
       {children}

patches/next-remote-watch+1.0.0.patch

@@ -4,9 +4,10 @@
 
 import {memo} from 'react';
 import cn from 'classnames';
+import type {SVGProps} from 'react';
 
 export const IconArrow = memo<
-  JSX.IntrinsicElements['svg'] & {
+  SVGProps<SVGSVGElement> & {
     /**
      * The direction the arrow should point.
      * `start` and `end` are relative to the current locale.

src/components/ExternalLink.tsx

@@ -4,9 +4,10 @@
 
 import {memo} from 'react';
 import cn from 'classnames';
+import type {SVGProps} from 'react';
 
 export const IconArrowSmall = memo<
-  JSX.IntrinsicElements['svg'] & {
+  SVGProps<SVGSVGElement> & {
     /**
      * The direction the arrow should point.
      * `start` and `end` are relative to the current locale.

src/components/Icon/IconArrow.tsx

@@ -3,10 +3,9 @@
  */
 
 import {memo} from 'react';
+import type {SVGProps} from 'react';
 
-export const IconBsky = memo<JSX.IntrinsicElements['svg']>(function IconBsky(
-  props
-) {
+export const IconBsky = memo<SVGProps<SVGSVGElement>>(function IconBsky(props) {
   return (
     <svg
       aria-label="Bluesky"