feat(phase0): upgrade Next.js 16, remove ESLint, consolidate on Biome

Co-authored-by: pm <pm@miriad.systems>

Author: Miriad

.eslintrc

@@ -26,10 +26,11 @@ export async function generateMetadata(
 	{ params }: { params: Params },
 	parent: ResolvingMetadata,
 ): Promise<Metadata> {
+	const resolvedParams = await params;
 	const lesson = (
 		await sanityFetch({
 			query: lessonQuery,
-			params,
+			params: resolvedParams,
 			stega: false,
 		})
 	).data as LessonQueryResult;
@@ -50,10 +51,11 @@ export async function generateMetadata(
 }
 
 export default async function LessonPage({ params }: { params: Params }) {
+	const resolvedParams = await params;
 	const [lesson, course] = (
 		await Promise.all([
-			sanityFetch({ query: lessonQuery, params }),
-			sanityFetch({ query: lessonsInCourseQuery, params }),
+			sanityFetch({ query: lessonQuery, params: resolvedParams }),
+			sanityFetch({ query: lessonsInCourseQuery, params: resolvedParams }),
 		])
 	).map((res) => res.data) as [
 		LessonQueryResult,

app/(main)/(course)/course/[courseSlug]/lesson/[lessonSlug]/page.tsx

@@ -1,5 +1,6 @@
-/** @type {import('next').NextConfig} */
-module.exports = {
+import type { NextConfig } from "next";
+
+const nextConfig: NextConfig = {
 	images: {
 		remotePatterns: [
 			{
@@ -11,3 +12,5 @@ module.exports = {
 		],
 	},
 };
+
+export default nextConfig;

next.config.js next.config.tsnext.config.js renamed to next.config.ts

@@ -4,7 +4,7 @@
 		"dev": "next dev --turbo",
 		"build": "next build",
 		"start": "next start",
-		"lint": "next lint",
+		"lint": "biome check .",
 		"predev": "npm run typegen",
 		"prebuild": "npm run typegen",
 		"typegen": "sanity schema extract --path=./sanity/extract.json && sanity typegen generate",
@@ -45,16 +45,16 @@
 		"@radix-ui/react-toggle": "^1.1.10",
 		"@radix-ui/react-toggle-group": "^1.1.11",
 		"@radix-ui/react-tooltip": "^1.2.8",
-		"@sanity/assist": "^5.0.0",
+		"@sanity/assist": "^5.0.4",
 		"@sanity/block-content-to-markdown": "^1.0.0",
-		"@sanity/client": "^7.11.1",
-		"@sanity/code-input": "^6.0.1",
+		"@sanity/client": "^7.16.0",
+		"@sanity/code-input": "^7.0.8",
 		"@sanity/icons": "^3.7.4",
-		"@sanity/image-url": "^1.2.0",
-		"@sanity/preview-url-secret": "^2.1.15",
-		"@sanity/studio-secrets": "^3.0.2",
-		"@sanity/ui": "^3.1.0",
-		"@sanity/vision": "^4.8.1",
+		"@sanity/image-url": "^2.0.3",
+		"@sanity/preview-url-secret": "^4.0.3",
+		"@sanity/studio-secrets": "^4.0.1",
+		"@sanity/ui": "^3.1.13",
+		"@sanity/vision": "^5.12.0",
 		"@sanity/webhook": "^4.0.4",
 		"@supabase/ssr": "^0.9.0",
 		"@supabase/supabase-js": "^2.98.0",
@@ -71,16 +71,16 @@
 		"jwt-decode": "^4.0.0",
 		"lucide-react": "^0.576.0",
 		"micromark": "^4.0.2",
-		"next": "^15.5.3",
-		"next-cloudinary": "^6.16.0",
-		"next-sanity": "^11.1.0",
+		"next": "^16.1.6",
+		"next-cloudinary": "^6.17.5",
+		"next-sanity": "^12.1.0",
 		"next-themes": "^0.4.6",
 		"nextjs-toploader": "^3.9.17",
 		"postcss": "^8.5.6",
-		"react": "^19.1.1",
+		"react": "^19.2.4",
 		"react-cookie": "^8.0.1",
 		"react-day-picker": "^9.14.0",
-		"react-dom": "^19.1.1",
+		"react-dom": "^19.2.4",
 		"react-dropzone": "^15.0.0",
 		"react-facebook-pixel": "^1.0.4",
 		"react-hook-form": "^7.71.2",
@@ -92,8 +92,8 @@
 		"react-syntax-highlighter": "^16.1.1",
 		"react-twitter-embed": "^4.0.4",
 		"recharts": "3.7.0",
-		"sanity": "^4.8.1",
-		"sanity-plugin-cloudinary": "^1.4.0",
+		"sanity": "^5.12.0",
+		"sanity-plugin-cloudinary": "^1.4.1",
 		"server-only": "^0.0.1",
 		"sonner": "^2.0.7",
 		"styled-components": "^6.1.19",
@@ -106,21 +106,23 @@
 	},
 	"devDependencies": {
 		"@biomejs/biome": "2.2.4",
-		"@eslint/eslintrc": "^3.3.1",
 		"@playwright/test": "^1.51.1",
 		"@tailwindcss/postcss": "^4.2.1",
 		"@tailwindcss/typography": "^0.5.19",
 		"@types/node": "^24.3.1",
 		"@types/react": "^19.1.12",
 		"@types/react-dom": "^19.1.9",
 		"@types/react-syntax-highlighter": "^15.5.13",
-		"eslint": "^9.35.0",
-		"eslint-config-next": "15.5.3",
 		"postcss": "^8",
 		"tailwindcss": "^4.2.1",
 		"typescript": "^5"
 	},
 	"pnpm": {
+		"onlyBuiltDependencies": [
+			"esbuild",
+			"sharp",
+			"unrs-resolver"
+		],
 		"peerDependencyRules": {
 			"allowAny": [
 				"react",