Nested files inside externals are still included in bundle

[elado]

For example, a package with next as a dependency in package.json, but has an import App from 'next/app' inside it, includes the entire source of next/app instead of treating it as an external.

The workaround is to include next/app as an external in rollup config, manually.

[elado]

This plugin fixes it https://github.com/Septh/rollup-plugin-node-externals