When overriding config.resolve.alias
incorrectly in next.config.js
webpack will throw an error because private-next-pages is not defined.
This is not a bug in Next.js, it's related to the user adding a custom webpack(config) config to next.config.js and overriding internals by not applying Next.js' aliases. Solution would be:
webpack(config) {
config.resolve.alias = {
...config.resolve.alias,
// your aliases
}
}