Nextjs app doesn't see sass package installed its directory when run from keystone root

[Bravo555]

Bug report

Describe the bug

I have a Keystone App that contains NextApp, located in root directory of my project. For the frontend I'm using Bulma CSS framework, thus I had to override global CSS in custom App.

The difference is that instead of importing ../styles.css I import ../styles.scss. My styles.scss looks like this:

@import "../node_modules/bulma/bulma.sass";

When running the npm run dev I receive the following error:

...
✔ Initialised Keystone instance
error - ./styles/styles.scss
To use Next.js' built-in Sass support, you first need to install `sass`.
Run `npm i sass` or `yarn add sass` inside your workspace.
...

After that, I installed package sass in the directory of my frontend, that is in app/package.json.
But I'm still getting the same error. When I ran npm run dev in app, it worked.

So I think the issue is that when Keystone launches Nextjs App, it points to wrong node_modules (points to node_modules, should point to app/node_modules).

Of course I could also just install sass in project root, however I don't want to install packages twice every time my Nextjs app needs one (I suspect that's the case with not only sass package but in general for other packages too). Also, I wouldn't want to keep frontend dependencies in keystone root directory, which should only contain dependencies for backend stuff.

To Reproduce

Steps to reproduce the behaviour. Please provide code snippets or a repository:

1. Create a keystone project from a starter template, and then add Nextjs app.
2. Initialise Nextjs app: npx create-next-app (project name: app).
3. Install frontend dependencies cd app && npm install --save bulma sass
4. Create app/pages/_app.js with following contents:

import '../styles/styles.sass';

export default function MyApp({ Component, pageProps }) {
    return <Component {...pageProps} />
}

5. Create app/styles/styles.sass with following contents:

@import "../node_modules/bulma/bulma.sass"

6. Run the app from project root: cd ../ && npm run dev
7. The error informing that sass package has to be installed is printed.

Expected behaviour

The error should not be printed. Package is installed in app/node_modules after all.

System information

• OS: Manjaro Linux