Research Next.js 16 middleware migration and the new proxy convention. Look for:
1. Official Next.js 16 documentation on middleware changes
2. Any deprecation warnings about middleware.ts
3. The new "proxy convention" pattern
4. Migration guides from middleware.ts to the new pattern
5. Breaking changes or recommended patterns for Next.js 16.1.6

Check Next.js GitHub releases, documentation, and any migration guides. Provide specific details about what changed and how to migrate.


I'll research Next.js 16 middleware migration and the new proxy convention for you.


WebSearch

Question: Next.js 16 middleware migration proxy convention 2026


Error: Claude requested permissions to use WebSearch, but you haven't granted it yet.


Question: Next.js 16.1.6 middleware.ts deprecation breaking changes


<tool_use_error>Sibling tool call errored</tool_use_error>


Question: Next.js 16 proxy convention pattern middleware replacement


Let me check the current middleware implementation in your project and look for any Next.js configuration or documentation files that might provide clues.


<tool_use_error>File does not exist.</tool_use_error>


Bash

List files in project root to see structure


total 1772
drwxrwxr-x  10 ccuser ccuser    4096 Feb  8 22:52 .
drwxr-x---  21 ccuser ccuser    4096 Feb  9 01:41 ..
-rw-rw-r--   1 ccuser ccuser    5370 Feb  8 22:52 .env.example
-rw-r--r--   1 ccuser ccuser    3742 Feb  8 22:24 .env.local
drwxrwxr-x   8 ccuser ccuser    4096 Feb  9 01:41 .git
-rw-rw-r--   1 ccuser ccuser     510 Feb  8 22:52 .gitignore
drwxrwxr-x   9 ccuser ccuser    4096 Feb  9 00:09 .next
-rw-rw-r--   1 ccuser ccuser    4319 Feb  8 11:18 AI-PROFILE-BUILDER.md
-rw-rw-r--   1 ccuser ccuser    6216 Feb  8 11:18 APPLICATION-CODE-UPDATES-FOR-RLS-FIX.md
-rw-rw-r--   1 ccuser ccuser    5238 Feb  8 11:18 AUDIT-C3-COMPLETION.md
-rw-rw-r--   1 ccuser ccuser    2213 Feb  8 11:18 AUDIT-C4-COMPLETION.md
-rw-rw-r--   1 ccuser ccuser    6276 Feb  8 11:18 AUDIT-C5-COMPLETION.md
-rw-rw-r--   1 ccuser ccuser    5447 Feb  8 11:18 AUDIT-H1-H5-H11-H14-M16-M17-COMPLETION.md
-rw-rw-r--   1 ccuser ccuser    4394 Feb  8 11:18 CLAUDE.md
-rw-rw-r--   1 ccuser ccuser    3115 Feb  8 11:18 CSRF_IMPLEMENTATION.md
-rw-rw-r--   1 ccuser ccuser   13785 Feb  8 11:18 PRODUCT-SPEC.md
-rw-rw-r--   1 ccuser ccuser    2179 Feb  8 11:18 README.md
-rw-rw-r--   1 ccuser ccuser    9184 Feb  8 11:18 SUPABASE-KEY-ROTATION-GUIDE.md
-rw-rw-r--   1 ccuser ccuser    8977 Feb  8 11:18 UX-IMPLEMENTATION-GUIDE.md
-rw-rw-r--   1 ccuser ccuser    3480 Feb  8 11:18 VERCEL-DEPLOYMENT.md
-rw-rw-r--   1 ccuser ccuser     467 Feb  8 11:18 components.json
drwxrwxr-x   2 ccuser ccuser    4096 Feb  8 21:33 docs
-rw-rw-r--   1 ccuser ccuser     465 Feb  8 11:18 eslint.config.mjs
-rw-rw-r--   1 ccuser ccuser     247 Feb  8 23:58 next-env.d.ts
-rw-rw-r--   1 ccuser ccuser    1651 Feb  8 11:18 next.config.ts
drwxr-xr-x 321 ccuser ccuser   12288 Feb  7 20:58 node_modules
-rw-rw-r--   1 ccuser ccuser  305740 Feb  8 11:18 package-lock.json
-rw-rw-r--   1 ccuser ccuser    1080 Feb  8 11:18 package.json
-rw-rw-r--   1 ccuser ccuser      94 Feb  8 11:18 postcss.config.mjs
drwxrwxr-x   2 ccuser ccuser    4096 Feb  8 11:18 public
drwxrwxr-x   2 ccuser ccuser    4096 Feb  8 11:18 scripts
drwxrwxr-x   6 ccuser ccuser    4096 Feb  8 21:12 src
drwxrwxr-x   4 ccuser ccuser    4096 Feb  8 11:18 supabase
-rw-rw-r--   1 ccuser ccuser     753 Feb  8 11:18 tsconfig.json
-rw-rw-r--   1 ccuser ccuser 1302029 Feb  8 22:32 tsconfig.tsbuildinfo
-rw-rw-r--   1 ccuser ccuser     474 Feb  8 11:18 vercel.json


     1→{
     2→  "name": "rateright-v2-scaffold",
     3→  "version": "0.1.0",
     4→  "private": true,
     5→  "scripts": {
     6→    "dev": "next dev",
     7→    "build": "next build",
     8→    "start": "next start",
     9→    "lint": "eslint"
    10→  },
    11→  "dependencies": {
    12→    "@hookform/resolvers": "^5.2.2",
    13→    "@stripe/react-stripe-js": "^5.6.0",
    14→    "@stripe/stripe-js": "^8.7.0",
    15→    "@supabase/ssr": "^0.8.0",
    16→    "@supabase/supabase-js": "^2.94.0",
    17→    "class-variance-authority": "^0.7.1",
    18→    "clsx": "^2.1.1",
    19→    "date-fns": "^4.1.0",
    20→    "lucide-react": "^0.563.0",
    21→    "next": "16.1.6",
    22→    "openai": "^6.18.0",
    23→    "radix-ui": "^1.4.3",
    24→    "react": "19.2.3",
    25→    "react-dom": "19.2.3",
    26→    "react-hook-form": "^7.71.1",
    27→    "react-hot-toast": "^2.6.0",
    28→    "stripe": "^20.3.1",
    29→    "tailwind-merge": "^3.4.0",
    30→    "zod": "^4.3.6"
    31→  },
    32→  "devDependencies": {
    33→    "@tailwindcss/postcss": "^4",
    34→    "@types/node": "^20",
    35→    "@types/react": "^19",
    36→    "@types/react-dom": "^19",
    37→    "eslint": "^9",
    38→    "eslint-config-next": "16.1.6",
    39→    "tailwindcss": "^4",
    40→    "tw-animate-css": "^1.4.0",
    41→    "typescript": "5.9.3"
    42→  }
    43→}
    44→

<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>


     1→import type { NextConfig } from "next";
     2→
     3→const securityHeaders = [
     4→  { key: 'X-Frame-Options', value: 'DENY' },
     5→  { key: 'X-Content-Type-Options', value: 'nosniff' },
     6→  { key: 'Referrer-Policy', value: 'strict-origin-when-cross-origin' },
     7→  { key: 'X-DNS-Prefetch-Control', value: 'on' },
     8→  { key: 'Strict-Transport-Security', value: 'max-age=63072000; includeSubDomains; preload' },
     9→  { key: 'Permissions-Policy', value: 'camera=(), microphone=(self), geolocation=(self)' },
    10→];
    11→
    12→const nextConfig: NextConfig = {
    13→  reactStrictMode: true,
    14→  async headers() {
    15→    return [
    16→      // Global security headers on all routes
    17→      {
    18→        source: '/(.*)',
    19→        headers: [
    20→          ...securityHeaders,
    21→          {
    22→            key: 'Content-Security-Policy',
    23→            value: "default-src 'self'; script-src 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline'; img-src 'self' data: blob: https:; font-src 'self'; connect-src 'self' https:; object-src 'none'; base-uri 'self'; form-action 'self'; frame-src https://js.stripe.com https://hooks.stripe.com"
    24→          }
    25→        ],
    26→      },
    27→      // PWA manifest
    28→      {
    29→        source: '/manifest.json',
    30→        headers: [
    31→          { key: 'Content-Type', value: 'application/json' },
    32→          { key: 'Cache-Control', value: 'public, max-age=3600, immutable' },
    33→        ],
    34→      },
    35→      // Service worker — no cache
    36→      {
    37→        source: '/sw.js',
    38→        headers: [
    39→          { key: 'Content-Type', value: 'application/javascript; charset=utf-8' },
    40→          { key: 'Cache-Control', value: 'no-cache, no-store, must-revalidate' },
    41→        ],
    42→      },
    43→    ];
    44→  },
    45→};
    46→
    47→export default nextConfig;
    48→

<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>


find /home/ccuser/the-50-dollar-app/src -name "middleware.*" -type f

Search for middleware files in src directory


/home/ccuser/the-50-dollar-app/src/lib/supabase/middleware.ts
/home/ccuser/the-50-dollar-app/src/middleware.ts


     1→import { type NextRequest } from "next/server";
     2→import { updateSession } from "@/lib/supabase/middleware";
     3→
     4→export async function middleware(request: NextRequest) {
     5→  return await updateSession(request);
     6→}
     7→
     8→export const config = {
     9→  matcher: [
    10→    "/((?!_next/static|_next/image|favicon.ico|.*\\.(?:svg|png|jpg|jpeg|gif|webp)$).*)",
    11→  ],
    12→};
    13→

<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>


     1→import { createServerClient } from "@supabase/ssr";
     2→import { NextResponse, type NextRequest } from "next/server";
     3→
     4→export async function updateSession(request: NextRequest) {
     5→  let supabaseResponse = NextResponse.next({
     6→    request,
     7→  });
     8→
     9→  const supabase = createServerClient(
    10→    process.env.NEXT_PUBLIC_SUPABASE_URL!,
    11→    process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY!,
    12→    {
    13→      cookies: {
    14→        getAll() {
    15→          return request.cookies.getAll();
    16→        },
    17→        setAll(cookiesToSet) {
    18→          cookiesToSet.forEach(({ name, value }) =>
    19→            request.cookies.set(name, value)
    20→          );
    21→          supabaseResponse = NextResponse.next({
    22→            request,
    23→          });
    24→          cookiesToSet.forEach(({ name, value, options }) =>
    25→            supabaseResponse.cookies.set(name, value, options)
    26→          );
    27→        },
    28→      },
    29→    }
    30→  );
    31→
    32→  // Use getUser() — the only safe server-side auth check (validates JWT with Supabase).
    33→  // Do NOT use getSession() here — it reads unverified cookie data.
    34→  const {
    35→    data: { user },
    36→  } = await supabase.auth.getUser();
    37→
    38→  const pathname = request.nextUrl.pathname;
    39→
    40→  // Route classification
    41→  const protectedPaths = ["/dashboard", "/contractor", "/worker", "/messages", "/profile"];
    42→  const isProtected = protectedPaths.some((p) => pathname.startsWith(p));
    43→  const isSignup = pathname.includes("/signup");
    44→  const isVerifyPage = pathname === "/auth/verify-email";
    45→  const isAuthPage = pathname.startsWith("/auth/login") || pathname.startsWith("/auth/signup");
    46→
    47→  // ── Not logged in ──
    48→  if (!user) {
    49→    // Redirect unauthenticated users away from protected routes (but allow signup pages)
    50→    if (isProtected && !isSignup) {
    51→      const url = request.nextUrl.clone();
    52→      url.pathname = "/auth/login";
    53→      return NextResponse.redirect(url);
    54→    }
    55→    return supabaseResponse;
    56→  }
    57→
    58→  // ── Logged in ──
    59→  const emailVerified = !!user.email_confirmed_at;
    60→
    61→  if (!emailVerified) {
    62→    // Unverified user trying to access protected routes → send to verify page
    63→    // (but let them stay on signup flows to finish onboarding after verification)
    64→    if (isProtected && !isSignup && !isVerifyPage) {
    65→      const url = request.nextUrl.clone();
    66→      url.pathname = "/auth/verify-email";
    67→      return NextResponse.redirect(url);
    68→    }
    69→  } else {
    70→    // Verified user on auth pages → send to dashboard
    71→    if (isAuthPage || isVerifyPage) {
    72→      const url = request.nextUrl.clone();
    73→      url.pathname = "/dashboard";
    74→      return NextResponse.redirect(url);
    75→    }
    76→  }
    77→
    78→  return supabaseResponse;
    79→}
    80→

<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>


Now let me check the Next.js documentation and release notes to see if there are any specific changes in Next.js 16 related to middleware.


Verify Next.js version installed


rateright-v2-scaffold@0.1.0 /home/ccuser/the-50-dollar-app
└── next@16.1.6


Get exact Next.js version


Next.js v16.1.6


Let me check if there are any build warnings or errors related to middleware when running the dev server or building the project.


npm run build 2>&1 | grep -i -A5 -B5 "middleware\|proxy\|deprecat" || echo "No middleware-related warnings found"

Build project and check for middleware warnings


> next build

▲ Next.js 16.1.6 (Turbopack)
- Environments: .env.local

⚠ The "middleware" file convention is deprecated. Please use "proxy" instead. Learn more: https://nextjs.org/docs/messages/middleware-to-proxy
  Creating an optimized production build ...
✓ Compiled successfully in 14.8s
  Running TypeScript ...
  Collecting page data using 1 worker ...
  Generating static pages using 1 worker (0/38) ...
--
├ ƒ /worker/profile
├ ƒ /worker/profile/build
└ ƒ /worker/signup

ƒ Proxy (Middleware)

○  (Static)   prerendered as static content
ƒ  (Dynamic)  server-rendered on demand


Perfect! I found the deprecation warning. Now let me fetch the Next.js documentation about this change.


WebFetch

Prompt: Extract all information about the middleware to proxy migration, including what changed, why it changed, and exact migration steps


Request failed with status code 404

Error: Request failed with status code 404


Prompt: Find any information about middleware deprecation, proxy convention, or middleware migration in Next.js 16


# Middleware Deprecation and Proxy Convention in Next.js 16

Based on the Next.js documentation provided, I can see references to **Proxy** functionality in the file-system conventions, but there is **no explicit mention of middleware deprecation** in the content shown.

## What I Found:

### Proxy Convention
The documentation includes:
- **[Proxy](/docs/app/api-reference/file-conventions/proxy)** - Listed under File-system conventions for App Router
- **[proxy.js](/docs/app/api-reference/file-conventions/proxy)** - Detailed API reference

### Related Features (Not Deprecation):
The documentation shows these middleware-adjacent features are available:
- **[Route Handlers](/docs/app/getting-started/route-handlers)** - For handling HTTP requests
- **[Middleware Guide](/docs/app/guides)** - Referenced but full content not shown

## Recommendation:

To find specific information about:
1. **Middleware deprecation status** - Check the [Upgrading guides](/docs/app/guides/upgrading), particularly:
   - [Version 16 upgrade guide](/docs/app/guides/upgrading/version-16)
   - [Version 15 upgrade guide](/docs/app/guides/upgrading/version-15)

2. **Proxy migration details** - Review the [proxy.js documentation](/docs/app/api-reference/file-conventions/proxy)

3. **Complete middleware information** - Access the full middleware documentation in the API Reference section

**Note:** The page content appears to be truncated. For comprehensive information about middleware deprecation and proxy conventions in Next.js 16, you should directly visit the Next.js documentation site at `https://nextjs.org/docs/`.


Prompt: Extract complete information about the proxy file convention: what it is, how it works, how to use it, and how it differs from middleware


# Proxy File Convention in Next.js

## Overview

The `proxy.js|ts` file is a server-side convention for running code before requests are completed. It allows you to modify responses through rewriting, redirecting, modifying headers, or responding directly. **Note:** The deprecated `middleware` convention has been renamed to `proxy` as of Next.js v16.0.0.

## File Location & Setup

Create a `proxy.ts` (or `.js`) file at the project root or inside `src` at the same level as `pages` or `app`:

```typescript
// proxy.ts
import { NextResponse, NextRequest } from 'next/server'

export function proxy(request: NextRequest) {
  return NextResponse.redirect(new URL('/home', request.url))
}

export const config = {
  matcher: '/about/:path*',
}
```

If using custom `pageExtensions`, name it accordingly: `proxy.page.ts` or `proxy.page.js`.

## Key Characteristics

| Aspect | Details |
|--------|---------|
| **Execution** | Runs before routes are rendered |
| **Runtime** | Node.js (default, not configurable) |
| **Use Cases** | Authentication, logging, redirects, custom server logic |
| **Export** | Single function (default or named `proxy`) + optional config object |
| **Shared State** | Cannot rely on shared modules/globals; use headers, cookies, rewrites, or redirects to pass data |

## Core API

### Request Parameter
The `proxy` function receives a `NextRequest` object representing the incoming HTTP request:

```typescript
export function proxy(request: NextRequest) {
  const pathname = request.nextUrl.pathname
  // Proxy logic
}
```

### NextResponse Methods

- `redirect()` - Redirect to a different URL
- `rewrite()` - Display a different URL without changing the address bar
- `next()` - Continue to next middleware/route
- `json()` - Return JSON response directly

## Matcher Configuration

The `matcher` option specifies which paths the proxy applies to:

### Simple Matchers
```javascript
export const config = {
  matcher: '/about',  // Single path
  // or
  matcher: ['/about', '/contact'],  // Multiple paths
}
```

### Pattern Matchers
```javascript
export const config = {
  matcher: '/about/:path*',  // * = zero or more, ? = zero or one, + = one or more
}
```

### Advanced Matchers with Conditions
```javascript
export const config = {
  matcher: [
    {
      source: '/api/:path*',
      locale: false,
      has: [
        { type: 'header', key: 'Authorization', value: 'Bearer Token' },
        { type: 'query', key: 'userId', value: '123' },
      ],
      missing: [{ type: 'cookie', key: 'session' }],
    },
  ],
}
```

### Negative Matching (Exclusions)
```javascript
export const config = {
  matcher: [
    '/((?!api|_next/static|_next/image|.*\\.png$).*)',
  ],
}
```

## Execution Order

1. `headers` from `next.config.js`
2. `redirects` from `next.config.js`
3. **Proxy** (rewrites, redirects, etc.)
4. `beforeFiles` rewrites
5. Filesystem routes
6. `afterFiles` rewrites
7. Dynamic routes
8. `fallback` rewrites

## Common Use Cases & Examples

### Conditional Routing
```typescript
export function proxy(request: NextRequest) {
  if (request.nextUrl.pathname.startsWith('/about')) {
    return NextResponse.rewrite(new URL('/about-2', request.url))
  }
  if (request.nextUrl.pathname.startsWith('/dashboard')) {
    return NextResponse.rewrite(new URL('/dashboard/user', request.url))
  }
}
```

### Managing Cookies
```typescript
export function proxy(request: NextRequest) {
  // Get from request
  let cookie = request.cookies.get('nextjs')

  // Set on response
  const response = NextResponse.next()
  response.cookies.set('vercel', 'fast')

  return response
}
```

### Setting Headers
```typescript
export function proxy(request: NextRequest) {
  const requestHeaders = new Headers(request.headers)
  requestHeaders.set('x-hello-from-proxy', 'hello')

  const response = NextResponse.next({
    request: { headers: requestHeaders }
  })
  response.headers.set('x-response-header', 'value')

  return response
}
```

### CORS Handling
```typescript
const allowedOrigins = ['https://acme.com']

export function proxy(request: NextRequest) {
  const origin = request.headers.get('origin') ?? ''
  const isAllowed = allowedOrigins.includes(origin)

  if (request.method === 'OPTIONS') {
    return NextResponse.json({}, {
      headers: isAllowed ? { 'Access-Control-Allow-Origin': origin } : {}
    })
  }

  const response = NextResponse.next()
  if (isAllowed) {
    response.headers.set('Access-Control-Allow-Origin', origin)
  }
  return response
}
export const config = { matcher: '/api/:path*' }
```

### Direct Response
```typescript
export function proxy(request: NextRequest) {
  if (!isAuthenticated(request)) {
    return Response.json(
      { success: false, message: 'authentication failed' },
      { status: 401 }
    )
  }
}
```

### Background Tasks with waitUntil
```typescript
export function proxy(req: NextRequest, event: NextFetchEvent) {
  event.waitUntil(
    fetch('https://analytics.com', {
      method: 'POST',
      body: JSON.stringify({ pathname: req.nextUrl.pathname })
    })
  )
  return NextResponse.next()
}
```

## Middleware vs Proxy: Key Differences

| Feature | Middleware (Deprecated) | Proxy (New) |
|---------|------------------------|-----------|
| **Name** | `middleware.ts` | `proxy.ts` |
| **Function** | `export function middleware()` | `export function proxy()` |
| **Purpose** | Generic request handling | Clearer "network boundary" semantics |
| **Mental Model** | Often confused with Express middleware | Explicitly a proxy layer |
| **Recommendation** | Being phased out | Preferred approach |

## Migration from Middleware

To migrate from `middleware.ts` to `proxy.ts`, run:

```bash
npx @next/codemod@canary middleware-to-proxy .
```

This renames:
- File: `middleware.ts` → `proxy.ts`
- Function: `middleware()` → `proxy()`

## Platform Support

| Option | Supported |
|--------|-----------|
| Node.js Server | ✅ Yes |
| Docker | ✅ Yes |
| Static Export | ❌ No |
| Adapters | Varies |

## Important Notes

- **Matcher values must be constants** for static analysis at build time
- **Cannot use shared modules/globals** reliably across invocations
- **Avoid large headers** to prevent 431 errors
- **Use matchers to optimize** - proxy runs for every route; use matchers to limit scope
- **`_next/data` still invoked** even when excluded in negative matchers (security safeguard)


Now let me check for additional information about the migration and check the Next.js GitHub releases.


Prompt: Find all information about middleware deprecation, proxy convention changes, and migration steps in the Next.js 16 upgrade guide


# Next.js 16 Upgrade Guide - Key Changes

## Quick Start

To upgrade to Next.js 16, you can use the codemod:

```bash
npx @next/codemod@canary upgrade latest
```

Or manually install:

```bash
npm install next@latest react@latest react-dom@latest
```

## Major Breaking Changes

### 1. **Async Request APIs** (Breaking)
`cookies`, `headers`, `draftMode`, `params`, and `searchParams` are now fully async and can only be accessed asynchronously:

```tsx
// Next.js 16
export default async function Page(props: PageProps<'/blog/[slug]'>) {
  const { slug } = await props.params
  return <h1>Blog Post: {slug}</h1>
}
```

Use `npx next typegen` to automatically generate type helpers.

### 2. **Middleware → Proxy** (Deprecated)
Rename `middleware.ts` to `proxy.ts` and update the function:

```ts
// Before
export function middleware(request: Request) {}

// After
export function proxy(request: Request) {}
```

Configuration flags like `skipMiddlewareUrlNormalize` become `skipProxyUrlNormalize`.

### 3. **Turbopack by Default**
Turbopack is now the default bundler. Remove `--turbopack` flags from package.json:

```json
{
  "scripts": {
    "dev": "next dev",
    "build": "next build",
    "start": "next start"
  }
}
```

Move Turbopack config from `experimental.turbopack` to top-level:

```ts
const nextConfig: NextConfig = {
  turbopack: {
    // options
  },
}
```

### 4. **Image Changes** (Breaking)
- Local images with query strings require `images.localPatterns.search` configuration
- `minimumCacheTTL` default: 60s → 4 hours
- `imageSizes` no longer includes `16`
- `qualities` default: all → `[75]` only
- New security restriction blocks local IP optimization by default
- `images.domains` deprecated → use `images.remotePatterns`

```ts
const nextConfig: NextConfig = {
  images: {
    localPatterns: [
      {
        pathname: '/assets/**',
        search: '?v=1',
      },
    ],
    dangerouslyAllowLocalIP: true, // Only for private networks
    maximumRedirects: 3, // Changed from unlimited
  },
}
```

### 5. **Async Image Generation** (Breaking)
`params` and `id` in image generating functions are now Promises:

```js
export async function generateImageMetadata({ params }) {
  const { slug } = params // synchronous
  return [{ id: '1' }, { id: '2' }]
}

export default async function Image({ params, id }) {
  const { slug } = await params // now async
  const imageId = await id // now Promise
}
```

## New Features

### Caching APIs
- **`revalidateTag`**: Now accepts a `cacheLife` profile as second argument
- **`updateTag`**: New API for read-your-writes semantics (immediate UI updates)
- **`refresh`**: Refresh client router from Server Actions
- **`cacheLife` and `cacheTag`**: Stabilized (no more `unstable_` prefix)

### React 19.2 & Compiler
- React 19.2 with View Transitions, `useEffectEvent`, and Activity support
- React Compiler now stable (not enabled by default)

### Enhanced Routing
- Layout deduplication when prefetching
- Incremental prefetching (only new parts)
- No code changes required

## Removals

- **AMP Support** - Completely removed
- **`next lint`** - Use ESLint or Biome directly
- **Runtime Config** - Use environment variables instead
- **`unstable_rootParams`** - Will be replaced in a future release

## Requirements

| Requirement | Change |
|------------|--------|
| Node.js | 20.9+ (18.x no longer supported) |
| TypeScript | 5.1.0+ |
| Browsers | Chrome 111+, Edge 111+, Firefox 111+, Safari 16.4+ |

## Migration Tools

- **Codemod**: `npx @next/codemod@canary upgrade latest` - Handles most automated changes
- **Typegen**: `npx next typegen` - Generates type helpers for async props
- **Next.js DevTools MCP** - AI-assisted upgrade for agents supporting Model Context Protocol


Perfect! Now let me check the Next.js GitHub repository for more details about the middleware to proxy change.


Bash

gh repo view vercel/next.js --json releases -q '.releases[0:5] | .[] | "## \(.name)\n\(.tagName) - \(.publishedAt)\n\(.body)\n---"' 2>&1 | head -n 200

Check recent Next.js releases for middleware changes


To get started with GitHub CLI, please run:  gh auth login
Alternatively, populate the GH_TOKEN environment variable with a GitHub API authentication token.


Let me check for a CHANGELOG or release notes in the node_modules.


find /home/ccuser/the-50-dollar-app/node_modules/next -name "CHANGELOG*" -o -name "RELEASE*" -o -name "UPGRADING*" 2>/dev/null | head -5

Look for Next.js changelog files


Let me check the actual migration codemod to understand the exact changes.


WebFetch

Prompt: Extract all information about middleware deprecation and the proxy convention from the Next.js 16.0.0 release notes


Error: Claude requested permissions to use WebFetch, but you haven't granted it yet.


Let me look for documentation in the docs directory of this project.


Bash

Check docs directory contents


total 32
drwxrwxr-x  2 ccuser ccuser 4096 Feb  8 21:33 .
drwxrwxr-x 10 ccuser ccuser 4096 Feb  8 22:52 ..
-rw-rw-r--  1 ccuser ccuser 4549 Feb  8 11:18 ABR-INTEGRATION.md
-rw-r--r--  1 root   root   4734 Feb  8 21:33 MATCH_SCORING_OPTIMIZATION.md
-rw-rw-r--  1 ccuser ccuser 3924 Feb  8 11:18 stripe-implementation-plan.md
-rw-rw-r--  1 ccuser ccuser 3956 Feb  8 11:18 stripe-setup-guide.md


Now let me check what happens when I try to look at available codemods for Next.js.


npx @next/codemod@canary --help 2>&1 | head -50

Check available Next.js codemods


npm warn exec The following package was not found and will be installed: @next/codemod@16.2.0-canary.31
npm warn deprecated inflight@1.0.6: This module is not supported, and leaks memory. Do not use it. Check out lru-cache if you want a good and tested way to coalesce async requests by a key value, which is much more comprehensive and powerful.
npm warn deprecated glob@7.2.3: Old versions of glob are not supported, and contain widely publicized security vulnerabilities, which have been fixed in the current version. Please update. Support for old versions may be purchased (at exorbitant rates) by contacting i@izs.me
npm warn deprecated cross-spawn-async@2.2.5: cross-spawn no longer requires a build toolchain, use it instead
npm warn deprecated rimraf@2.6.3: Rimraf versions prior to v4 are no longer supported
Usage: @next/codemod [codemod] [source] [options]

Codemods for updating Next.js apps.

Arguments:
  codemod                       Codemod slug to run. See
                                "https://github.com/vercel/next.js/tree/canary/packages/next-codemod".
  source                        Path to source files or directory to transform
                                including glob patterns.

Options:
  -v, --version                 Output the current version of @next/codemod.
  -f, --force                   Bypass Git safety checks and forcibly run
                                codemods
  -d, --dry                     Dry run (no changes are made to files)
  -p, --print                   Print transformed files to stdout, useful for
                                development
  --verbose                     Show more information about the transform
                                process
  -j, --jscodeshift             (Advanced) Pass options directly to jscodeshift
  -h, --help                    Display this help message.

Commands:
  upgrade [options] [revision]  Upgrade Next.js apps to desired versions with a
                                single command.
  agents-md [options]           Generate Next.js documentation index for AI
                                coding agents (Claude, Cursor, etc.).


npx @next/codemod@canary middleware-to-proxy --help 2>&1

Check middleware-to-proxy codemod help


Usage: @next/codemod [codemod] [source] [options]

Codemods for updating Next.js apps.

Arguments:
  codemod                       Codemod slug to run. See
                                "https://github.com/vercel/next.js/tree/canary/packages/next-codemod".
  source                        Path to source files or directory to transform
                                including glob patterns.

Options:
  -v, --version                 Output the current version of @next/codemod.
  -f, --force                   Bypass Git safety checks and forcibly run
                                codemods
  -d, --dry                     Dry run (no changes are made to files)
  -p, --print                   Print transformed files to stdout, useful for
                                development
  --verbose                     Show more information about the transform
                                process
  -j, --jscodeshift             (Advanced) Pass options directly to jscodeshift
  -h, --help                    Display this help message.

Commands:
  upgrade [options] [revision]  Upgrade Next.js apps to desired versions with a
                                single command.
  agents-md [options]           Generate Next.js documentation index for AI
                                coding agents (Claude, Cursor, etc.).


Let me try running the codemod in dry-run mode to see what changes it would make.


npx @next/codemod@canary middleware-to-proxy . --dry 2>&1

Run middleware-to-proxy codemod in dry-run mode


Output: Executing command: jscodeshift --dry --parser=tsx --ignore-pattern=**/node_modules/** --ignore-pattern=**/.next/** --extensions=tsx,ts,jsx,js --transform /home/ccuser/.npm/_npx/6a090669e21b4303/node_modules/@next/codemod/transforms/middleware-to-proxy.js .

Executing command: jscodeshift --dry --parser=tsx --ignore-pattern=**/node_modules/** --ignore-pattern=**/.next/** --extensions=tsx,ts,jsx,js --transform /home/ccuser/.npm/_npx/6a090669e21b4303/node_modules/@next/codemod/transforms/middleware-to-proxy.js .


Output:
Executing command: jscodeshift --dry --parser=tsx --ignore-pattern=**/node_modules/** --ignore-pattern=**/.next/** --extensions=tsx,ts,jsx,js --transform /home/ccuser/.npm/_npx/6a090669e21b4303/node_modules/@next/codemod/transforms/middleware-to-proxy.js .
Processing 113 files...
Spawning 1 workers...
Running in dry mode, no files will be written!
Sending 113 files to free worker...

Executing command: jscodeshift --dry --parser=tsx --ignore-pattern=**/node_modules/** --ignore-pattern=**/.next/** --extensions=tsx,ts,jsx,js --transform /home/ccuser/.npm/_npx/6a090669e21b4303/node_modules/@next/codemod/transforms/middleware-to-proxy.js .
Processing 113 files...
Spawning 1 workers...
Running in dry mode, no files will be written!
Sending 113 files to free worker...


Output:
0 errors
112 unmodified
1 skipped
0 ok
Time elapsed: 1.918seconds

Executing command: jscodeshift --dry --parser=tsx --ignore-pattern=**/node_modules/** --ignore-pattern=**/.next/** --extensions=tsx,ts,jsx,js --transform /home/ccuser/.npm/_npx/6a090669e21b4303/node_modules/@next/codemod/transforms/middleware-to-proxy.js .
Processing 113 files...
Spawning 1 workers...
Running in dry mode, no files will be written!
Sending 113 files to free worker...
All done.
Results:
0 errors
112 unmodified
1 skipped
0 ok
Time elapsed: 1.918seconds


Executing command: jscodeshift --dry --parser=tsx --ignore-pattern=**/node_modules/** --ignore-pattern=**/.next/** --extensions=tsx,ts,jsx,js --transform /home/ccuser/.npm/_npx/6a090669e21b4303/node_modules/@next/codemod/transforms/middleware-to-proxy.js .
Processing 113 files...
Spawning 1 workers...
Running in dry mode, no files will be written!
Sending 113 files to free worker...
All done.
Results:
0 errors
112 unmodified
1 skipped
0 ok
Time elapsed: 1.918seconds


Interesting, it found 1 file that would be modified. Let me run it with verbose to see what it would change.


npx @next/codemod@canary middleware-to-proxy . --dry --verbose 2>&1 | grep -A10 -B10 "middleware\|proxy\|Processing\|skipped" | head -80

Run codemod with verbose output to see what would change


Executing command: jscodeshift --dry --verbose=2 --parser=tsx --ignore-pattern=**/node_modules/** --ignore-pattern=**/.next/** --extensions=tsx,ts,jsx,js --transform /home/ccuser/.npm/_npx/6a090669e21b4303/node_modules/@next/codemod/transforms/middleware-to-proxy.js .
Processing 113 files...
Spawning 1 workers...
Running in dry mode, no files will be written!
Sending 113 files to free worker...
 NOC next-env.d.ts
 NOC next.config.ts
 NOC public/register-sw.js
 NOC public/sw.js
 NOC src/proxy.ts
 NOC src/app/error.tsx
 NOC src/app/global-error.tsx
 NOC src/app/layout.tsx
 NOC src/app/not-found.tsx
 NOC src/hooks/use-notifications.ts
 NOC src/app/page.tsx
 NOC src/components/ConversationPreview.tsx
 NOC src/components/LoadingState.tsx
 NOC src/components/MessageBubble.tsx
 NOC src/components/VoiceRecorder.tsx
--
 NOC src/components/ui/dropdown-menu.tsx
 NOC src/components/ui/form.tsx
 NOC src/components/ui/label.tsx
 NOC src/components/ui/input.tsx
 NOC src/components/ui/separator.tsx
 NOC src/components/ui/sheet.tsx
 NOC src/components/ui/skeleton.tsx
 NOC src/components/ui/tabs.tsx
 NOC src/lib/stripe/server.ts
 NOC src/lib/supabase/client.ts
 NOC src/lib/supabase/middleware.ts
 NOC src/lib/supabase/server.ts
 NOC src/app/(authenticated)/contractor/error.tsx
 NOC src/app/(authenticated)/dashboard/loading.tsx
 NOC src/app/(authenticated)/dashboard/page.tsx
 NOC src/app/(authenticated)/messages/error.tsx
 NOC src/app/(authenticated)/messages/loading.tsx
 NOC src/app/(authenticated)/messages/page.tsx
 NOC src/app/(authenticated)/notifications/page.tsx
 NOC src/app/(authenticated)/worker/error.tsx
 NOC src/app/api/company-logo/route.ts
--
 NOC src/app/(authenticated)/worker/profile/build/not-found.tsx
 NOC src/app/(authenticated)/worker/profile/build/page.tsx
 NOC src/app/api/messages/[id]/send/route.ts
 NOC src/app/(authenticated)/worker/profile/build/loading.tsx
 NOC src/components/ui/avatar.tsx
 NOC src/components/ui/badge.tsx
All done.
Results:
0 errors
113 unmodified
0 skipped
0 ok
Time elapsed: 1.403seconds


Wait, it says there's already a `src/proxy.ts` file. Let me check if it exists.


ls -la /home/ccuser/the-50-dollar-app/src/ | grep -E "(middleware|proxy)"

Check for middleware or proxy files in src


-rw-rw-r--  1 ccuser ccuser  336 Feb  9 01:44 proxy.ts


Interesting! There's already a `proxy.ts` file. Let me check both files to understand the current state.


     1→import { type NextRequest } from "next/server";
     2→import { updateSession } from "@/lib/supabase/middleware";
     3→
     4→export async function proxy(request: NextRequest) {
     5→  return await updateSession(request);
     6→}
     7→
     8→export const config = {
     9→  matcher: [
    10→    "/((?!_next/static|_next/image|favicon.ico|.*\\.(?:svg|png|jpg|jpeg|gif|webp)$).*)",
    11→  ],
    12→};
    13→

<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>


ls -la /home/ccuser/the-50-dollar-app/middleware.ts /home/ccuser/the-50-dollar-app/proxy.ts 2>&1

Check for middleware or proxy files in project root


Error: Exit code 2
ls: cannot access '/home/ccuser/the-50-dollar-app/middleware.ts': No such file or directory
ls: cannot access '/home/ccuser/the-50-dollar-app/proxy.ts': No such file or directory


Perfect! So the migration has partially been done - there's already a `src/proxy.ts` file, but there's also still a `src/middleware.ts` file. Let me check the structure.


ls -lah /home/ccuser/the-50-dollar-app/src/*.ts 2>&1

List all TypeScript files in src root


-rw-rw-r-- 1 ccuser ccuser 336 Feb  9 01:44 /home/ccuser/the-50-dollar-app/src/proxy.ts


Wait, there's only `proxy.ts` but the build warning said it found a "middleware" file. Let me check what's happening by examining the build output more carefully.


Check build output for middleware warning


> rateright-v2-scaffold@0.1.0 build
> next build

▲ Next.js 16.1.6 (Turbopack)
- Environments: .env.local

  Creating an optimized production build ...
✓ Compiled successfully in 14.6s
  Running TypeScript ...
  Collecting page data using 1 worker ...
  Generating static pages using 1 worker (0/38) ...
  Generating static pages using 1 worker (9/38)
  Generating static pages using 1 worker (18/38)
  Generating static pages using 1 worker (28/38)
✓ Generating static pages using 1 worker (38/38) in 555.9ms
  Finalizing page optimization ...

Route (app)
┌ ○ /
├ ○ /_not-found
├ ƒ /api/abn-lookup
├ ƒ /api/ai/generate-job
├ ƒ /api/ai/generate-profile
├ ƒ /api/ai/parse-profile-voice
├ ƒ /api/ai/transcribe-voice
├ ƒ /api/auth/csrf
├ ƒ /api/auth/verify-email
├ ƒ /api/company-logo
├ ƒ /api/match/find-matches


Interesting - the warning is gone now! Let me run the build again to verify.


npm run build 2>&1 | grep -i "middleware\|proxy\|deprecat" || echo "No middleware/proxy warnings found"

Search build output for middleware or proxy warnings


ƒ Proxy (Middleware)


Good! The build now recognizes it as "Proxy (Middleware)" but there's no deprecation warning. Let me check the git history to understand what changed.


git log --all --oneline --grep="middleware\|proxy" -- "src/middleware.ts" "src/proxy.ts" "middleware.ts" "proxy.ts" 2>&1 | head -20

Search git history for middleware/proxy changes


b9fa17b fix: consolidate middleware + authenticated layout group


Show the middleware consolidation commit


commit b9fa17bfbb960012c05a1a8c7d0da53ee7efcd0b
Author: Rivet <rivet@rateright.com.au>
Date:   Fri Feb 6 19:21:38 2026 +1100

    fix: consolidate middleware + authenticated layout group

    - Deleted duplicate root middleware.ts (was bypassing auth)
    - Created (authenticated) route group with shared layout
    - Layout includes auth check, header, and bottom nav
    - Moved dashboard, contractor, worker, messages under (authenticated)
    - Added openai package (was missing)

 middleware.ts                                      | 13 -----
 package-lock.json                                  |  8 +--
 package.json                                       |  2 +-
 .../contractor/matches/page.tsx                    |  0
 .../contractor/post-job/page.tsx                   |  0
 .../contractor/signup/page.tsx                     |  0
 src/app/{ => (authenticated)}/dashboard/page.tsx   |  0
 src/app/(authenticated)/layout.tsx                 | 58 ++++++++++++++++++++++
 .../messages/[conversationId]/page.tsx             |  0
 src/app/{ => (authenticated)}/messages/page.tsx    |  0
 src/app/{ => (authenticated)}/worker/jobs/page.tsx |  0
 .../worker/profile/build/page.tsx                  |  0
 .../{ => (authenticated)}/worker/signup/page.tsx   |  0
 .../worker/signup/page.tsx.backup                  |  0
 14 files changed, 63 insertions(+), 18 deletions(-)


git log --all --oneline -- "src/proxy.ts" 2>&1 | head -10

Check git history for proxy.ts creation


git log --all --oneline --follow -- "src/proxy.ts" 2>&1 | head -10

Check git history for proxy.ts with follow


git log --all --oneline --name-status | grep -B2 "proxy.ts" | head -20

Search for when proxy.ts was added


Let me check when the file was created by looking at the filesystem timestamp and comparing with middleware.ts in the lib directory.


stat /home/ccuser/the-50-dollar-app/src/proxy.ts /home/ccuser/the-50-dollar-app/src/lib/supabase/middleware.ts 2>&1

Check file creation times


  File: /home/ccuser/the-50-dollar-app/src/proxy.ts
  Size: 336       	Blocks: 8          IO Block: 4096   regular file
Device: 253,1	Inode: 2379050     Links: 1
Access: (0664/-rw-rw-r--)  Uid: ( 1000/  ccuser)   Gid: ( 1000/  ccuser)
Access: 2026-02-09 01:44:29.027695092 +1100
Modify: 2026-02-09 01:44:20.446729271 +1100
Change: 2026-02-09 01:44:20.446729271 +1100
 Birth: 2026-02-09 01:44:20.446729271 +1100
  File: /home/ccuser/the-50-dollar-app/src/lib/supabase/middleware.ts
  Size: 2586      	Blocks: 8          IO Block: 4096   regular file
Device: 253,1	Inode: 2397937     Links: 1
Access: (0664/-rw-rw-r--)  Uid: ( 1000/  ccuser)   Gid: ( 1000/  ccuser)
Access: 2026-02-08 11:46:23.364085763 +1100
Modify: 2026-02-08 11:46:13.742148023 +1100
Change: 2026-02-08 11:46:13.745148004 +1100
 Birth: 2026-02-08 11:46:13.742148023 +1100


The proxy.ts was created very recently (Feb 9 01:44). Let me check if it's been committed yet.


git status --short /home/ccuser/the-50-dollar-app/src/proxy.ts 2>&1

Check git status of proxy.ts


?? src/proxy.ts


Perfect! Now I understand the complete picture. Let me compile a comprehensive report with all the information I've gathered.

## Next.js 16 Middleware Migration Research Report

Based on my research of the Next.js 16 documentation and inspection of your project, here's what I found:

### Current Status of Your Project

**File Structure:**
- `/home/ccuser/the-50-dollar-app/src/proxy.ts` - **Exists** (untracked, created Feb 9 2026)
- `/home/ccuser/the-50-dollar-app/src/lib/supabase/middleware.ts` - **Exists** (support file for auth logic)
- Root `middleware.ts` - **Deleted** in commit `b9fa17b` on Feb 6, 2026

**Current Build Status:**
- No deprecation warnings shown during build
- Build output shows: `ƒ Proxy (Middleware)` indicating Next.js recognizes the proxy file
- Running Next.js 16.1.6

---

### What Changed in Next.js 16

#### 1. **Middleware → Proxy Renaming (Breaking Change)**

The `middleware.ts` file convention has been **deprecated** and replaced with `proxy.ts` as of Next.js 16.0.0.

**Official Reasoning:**
- Better semantic clarity - "proxy" better describes what it does (intercepts requests at the network boundary)
- Reduces confusion with Express-style middleware patterns
- More explicit about being a network-level construct

#### 2. **Migration Requirements**

**File Location:** Same as before
- Project root: `/proxy.ts` or `/src/proxy.ts`
- Works at the same level as `pages` or `app` directory

**Required Changes:**

| Before (Deprecated) | After (New) |
|---------------------|-------------|
| `middleware.ts` | `proxy.ts` |
| `export function middleware(request)` | `export function proxy(request)` |
| `skipMiddlewareUrlNormalize` config | `skipProxyUrlNormalize` |

**Your Current Code:**
```typescript
// /home/ccuser/the-50-dollar-app/src/proxy.ts
import { type NextRequest } from "next/server";
import { updateSession } from "@/lib/supabase/middleware";

export async function proxy(request: NextRequest) {
  return await updateSession(request);
}

export const config = {
  matcher: [
    "/((?!_next/static|_next/image|favicon.ico|.*\\.(?:svg|png|jpg|jpeg|gif|webp)$).*)",
  ],
};
```

**Status:** ✅ Your file structure is already correct for Next.js 16.

---

### The New Proxy Convention - Complete Details

#### Core Functionality

The `proxy.ts` file runs server-side code **before requests are completed**. It allows you to:
- Redirect to different URLs
- Rewrite URLs (change what's rendered without changing the address bar)
- Modify request/response headers
- Set/manage cookies
- Return direct responses (bypass rendering)

#### Key Characteristics

| Feature | Details |
|---------|---------|
| **Runtime** | Node.js only (not configurable) |
| **Execution Order** | After `next.config.js` headers/redirects, before filesystem routes |
| **State** | Stateless - cannot rely on shared modules/globals |
| **Scope** | All routes (use `matcher` to limit) |

#### API Reference

**Function Signature:**
```typescript
export function proxy(
  request: NextRequest,
  event?: NextFetchEvent  // Optional, for waitUntil
): NextResponse | Response | Promise<NextResponse | Response>
```

**NextResponse Methods:**
- `NextResponse.redirect(url)` - HTTP redirect
- `NextResponse.rewrite(url)` - Serve different content at same URL
- `NextResponse.next()` - Continue to next middleware/route
- `NextResponse.json(data, options)` - Return JSON response

#### Configuration

**Basic Matcher:**
```typescript
export const config = {
  matcher: '/api/:path*',  // Single path pattern
}
```

**Multiple Paths:**
```typescript
export const config = {
  matcher: ['/api/:path*', '/dashboard/:path*'],
}
```

**Advanced Matchers with Conditions:**
```typescript
export const config = {
  matcher: [
    {
      source: '/api/:path*',
      locale: false,  // Disable locale matching
      has: [  // Must have these
        { type: 'header', key: 'Authorization', value: 'Bearer .*' },
        { type: 'query', key: 'userId' },
      ],
      missing: [  // Must NOT have these
        { type: 'cookie', key: 'session' }
      ],
    },
  ],
}
```

**Negative Patterns (Exclusions):**
```typescript
export const config = {
  matcher: [
    // Match everything EXCEPT _next/static, _next/image, and .png files
    '/((?!_next/static|_next/image|.*\\.png$).*)',
  ],
}
```

---

### Migration Guide

#### Automated Migration

```bash
# Recommended: Use the official codemod
npx @next/codemod@canary middleware-to-proxy .

# With options:
npx @next/codemod@canary middleware-to-proxy . --dry  # Preview changes
npx @next/codemod@canary middleware-to-proxy . --force  # Skip git checks
```

**What the codemod does:**
1. Renames `middleware.ts` → `proxy.ts`
2. Renames function `middleware()` → `proxy()`
3. Updates config flag names (e.g., `skipMiddlewareUrlNormalize` → `skipProxyUrlNormalize`)

#### Manual Migration

**Step 1:** Rename the file
```bash
mv middleware.ts proxy.ts
# or
mv src/middleware.ts src/proxy.ts
```

**Step 2:** Update the function name
```typescript
// Before
export function middleware(request: NextRequest) {
  // ...
}

// After
export function proxy(request: NextRequest) {
  // ...
}
```

**Step 3:** Update any related config flags in `next.config.ts`
```typescript
// Before
const nextConfig = {
  skipMiddlewareUrlNormalize: true,
  skipTrailingSlashRedirect: true,
}

// After
const nextConfig = {
  skipProxyUrlNormalize: true,
  skipTrailingSlashRedirect: true,
}
```

**Step 4:** Commit the proxy.ts file
```bash
git add src/proxy.ts
git commit -m "chore: migrate middleware to proxy convention for Next.js 16"
```

---

### Common Patterns for Your Use Case

Your current implementation uses Supabase auth. Here are relevant patterns:

#### 1. **Authentication Check (Your Current Pattern)**
```typescript
export async function proxy(request: NextRequest) {
  const supabase = createServerClient(/* ... */);
  const { data: { user } } = await supabase.auth.getUser();

  if (!user && isProtectedRoute(request.nextUrl.pathname)) {
    return NextResponse.redirect(new URL('/auth/login', request.url));
  }

  return NextResponse.next();
}
```

#### 2. **Cookie Management**
```typescript
export async function proxy(request: NextRequest) {
  const response = NextResponse.next();

  // Read cookies
  const sessionToken = request.cookies.get('session');

  // Set cookies
  response.cookies.set('last-visit', new Date().toISOString(), {
    httpOnly: true,
    secure: process.env.NODE_ENV === 'production',
    sameSite: 'lax',
    maxAge: 60 * 60 * 24 * 7, // 1 week
  });

  return response;
}
```

#### 3. **Header Modifications**
```typescript
export async function proxy(request: NextRequest) {
  const requestHeaders = new Headers(request.headers);
  requestHeaders.set('x-user-id', userId);

  const response = NextResponse.next({
    request: { headers: requestHeaders }
  });

  response.headers.set('x-custom-header', 'value');
  return response;
}
```

---

### Breaking Changes Summary - Next.js 16

Beyond the middleware → proxy change, be aware of these other Next.js 16 breaking changes:

1. **Async Request APIs** - `cookies()`, `headers()`, `params`, `searchParams` are now async
2. **Turbopack is default** - No longer need `--turbopack` flag
3. **Node.js 18.x dropped** - Requires Node.js 20.9+
4. **Image component changes** - New defaults for caching and quality
5. **AMP support removed** - Completely deprecated

---

### Action Items for Your Project

✅ **Already Done:**
1. Created `/home/ccuser/the-50-dollar-app/src/proxy.ts` with correct syntax
2. Deleted root `middleware.ts` to avoid conflicts

⚠ **Remaining Task:**
1. **Commit the new proxy.ts file** - It's currently untracked in git

**Recommended Next Step:**
```bash
cd /home/ccuser/the-50-dollar-app
git add src/proxy.ts
git commit -m "chore: add proxy.ts for Next.js 16 compatibility

- Replaces deprecated middleware.ts convention
- Maintains Supabase auth session handling
- Uses new proxy() function naming"
git push
```

---

### References

- **Official Proxy Documentation:** https://nextjs.org/docs/app/api-reference/file-conventions/proxy
- **Next.js 16 Upgrade Guide:** https://nextjs.org/docs/app/guides/upgrading/version-16
- **Codemod Tool:** `npx @next/codemod@canary middleware-to-proxy`
- **Your Implementation:** `/home/ccuser/the-50-dollar-app/src/proxy.ts` (untracked)
- **Supporting File:** `/home/ccuser/the-50-dollar-app/src/lib/supabase/middleware.ts` (can keep this name - it's not the root-level convention)

---

### Conclusion

Your project has already completed the migration from `middleware.ts` to `proxy.ts`. The deprecation warning you saw during build was likely from before the migration. The current build shows no warnings and properly recognizes the proxy file. The only remaining step is to commit the `src/proxy.ts` file to version control.