OpenGraph-Image unable to locate static files via process.cwd()

[danieldelcore]

Link to the code that reproduces this issue

https://codesandbox.io/p/devbox/practical-brattain-ghlpgf

To Reproduce

Navigate to https://hypermod-a6gx8i6po-codeshiftcommunity.vercel.app/explore/react-19-remove-forwardref and attempt to read opengraph image (https://www.opengraph.xyz/)
Vercel server will log an error stating that it is unable to access static files

[Error: ENOENT: no such file or directory, open '/var/task/public/images/og/logo.png'] {
  errno: -2,
  code: 'ENOENT',
  syscall: 'open',
  path: '/var/task/public/images/og/logo.png'
}

However in development mode this works as expected

Using the repo, it needs to be deployed in order to replicate https://codesandbox.io/p/devbox/practical-brattain-ghlpgf

Current vs. Expected behavior

Current behaviour appears to be that the following code does not work as expected since cwd is not the same in prod/dev environments

const interSemiBold = await readFile(join(process.cwd(), 'assets/Inter-SemiBold.ttf'))

My code is as follows:

import { readFile } from 'node:fs/promises';
import { ImageResponse } from 'next/og';
import { join } from 'node:path';

export const alt = 'Foo';
export const size = { width: 1200, height: 630 };

export const contentType = 'image/png';

// Image generation
export default async function Image({ params }: { params: { slug: string } }) {
  const cwd = process.cwd();
  const font = await readFile(join(cwd, '/assets/fonts/Inter-Bold.ttf'));
  const fontSrc = Uint8Array.from(font).buffer;
  const logoData = await readFile(join(cwd, 'public/images/og/logo.png'));
  const logoSrc = Uint8Array.from(logoData).buffer;

  return new ImageResponse((<div>...<div>),
    {
      ...size
      fonts: [
       {
          name: 'Inter',
          data: fontSrc,
          style: 'normal',
          weight: 500
        }
      ]
    }
  );
}

Provide environment information

Vercel Prod
Next: 14.2.15
App router

Which area(s) are affected? (Select all that apply)

Image (next/image)

Which stage(s) are affected? (Select all that apply)

Vercel (Deployed)

Additional context

No response

[danieldelcore]

#64683