Large middleware size

[arlyon]

Environment

System:
OS: Linux 6.0 Fedora Linux 37 (Workstation Edition)
CPU: (16) x64 AMD Ryzen 7 PRO 5850U with Radeon Graphics
Memory: 18.20 GB / 27.23 GB
Container: Yes
Shell: 5.9 - /usr/bin/zsh
Binaries:
Node: 16.14.2 - ~/.nvm/versions/node/v16.14.2/bin/node
Yarn: 1.22.19 - ~/.nvm/versions/node/v16.14.2/bin/yarn
npm: 8.5.0 - ~/.nvm/versions/node/v16.14.2/bin/npm
Watchman: 0.0.0 - /usr/bin/watchman
Browsers:
Chrome: beta
Firefox: 107.0
npmPackages:
next: latest => 13.0.6
next-auth: latest => 4.18.0
react: ^18.2.0 => 18.2.0

Reproduction URL

https://github.com/nextauthjs/next-auth-example

Describe the issue

The default out-of-the-box middleware is about 50KB:

| conf  | size   |
| ----- | ------ |
| none  | 0KB    |
| empty | 13.8KB |
| auth  | 62.6KB |

This seems oddly large to me given that the entirety of react + react-dom + nextjs + next-auth comes in at 83.5KB in the same example project.

How to reproduce

Build the example project.

Expected behavior

Smaller bundle size.

[Kinbaum]

@balazsorban44 Has the been any further investigation into this?
I am running into the same issue with a vanilla create-next-app using app dir.

My real application uses i18n and follows the official Next.js example on how to implement this with middleware.
I have some routes I am protecting as well. This is when I saw the large file size.

So I stripped back my entire middleware file to be just the following content:

// middleware.ts
export { default } from 'next-auth/middleware';

export const config = {
  matcher: [ '/admin' ]
};

This produces the following size when running next build

- ƒ Middleware                               213 kB

If I omit all of the next-auth middleware-related items, and just use middleware for the locale checks, I get the following size:

+ ƒ Middleware                               29.2 kB

[alexnguyennz]

Hi is there any update on this?

[ScareCrow95]

Just ran into the exact same issue :(

[Chris-Sahyouni]

same here