Steps to reproduce

See https://answers.netlify.com/t/next-js-deploy-error-cannot-find-module-webpack-runtime-js/46231 for full details.

It looks like Basic Features: Environment Variables | Next.js are not supported by the Netlify Next.js plugin.

To avoid duplicating variables it would be great to support this out of the box, like Vercel.

A link to a reproduction repository

https://nextjs.org/docs/basic-features/environment-variables

Plugin version

4.0.0-beta.7

More information about your build

• I am building using the CLI
• I am building using file-based configuration (netlify.toml)

What OS are you using?

Windows

Your netlify.toml file

[build]
  publish = ".next"

[[plugins]]
  package = "@netlify/plugin-nextjs"

[functions]
  included_files = [".next/*.json"]

Relevant log output (or link to your logs)

See https://answers.netlify.com/t/next-js-deploy-error-cannot-find-module-webpack-runtime-js/46231 for full details.