* Add built-in Sass support

* Add copy of CSS tests for SCSS

* Fix failing tests

* Fix url-loader tests

* Remove css file generated by tests

* Fix nprogress import for css file

* Fix SCSS modules (still 2 tests that need investigating)

* Update documentation for Sass support

* Fix plain CSS import test

* Fix formatting with prettier fix

* Update test output to reflect scss usage

* Revert "Fix plain CSS import test"

This reverts commit 380319d9d0c4bfb19e28c210262ccd82d19f3556.

# Conflicts:
#	test/integration/scss-modules/test/index.test.js

* Update loader structure

* Resolve loaders before passing to compile function

* Remove dead filter  code

* Arrange loaders in order and push to array

* Fix loader order bug

* Fix global Sass loader and make module prepocessor optional

* Adjust Sass Modules Implementation

* Fix typo

* Adjust regexps

* Use regexes

* Simplify global setup

* Adjust comments

* fix regex

* Simplify identifier file

* Update Sass Instructions

* Remove unneeded fixtures

* Adjust global tests

* Remove wrapper

* Update source maps

* Flag scss behavior

* Fix css property value

* Update fixtures with Sass vars

* Turn on Scss support

* fix HMR test

* Fix snapshots
Co-authored-by: NTim Neutkens <tim@timneutkens.nl>
Co-authored-by: NJoe Haddad <timer150@gmail.com>

* Breakup CSS test suite

* De-dupe next.config.js for css-fixtures

* CSS Module Support

* Fix Server-Side Render of CSS Modules

* Fix Jest Snapshots
https://github.com/facebook/jest/pull/8492

* Fix snapshots

* Add test for CSS module edit without remounting

* Add tests for dev and production style being applied

* Add missing TODOs

* Include/exclude should only be applied to issuer, not the CSS file itself

* Add CSS modules + node_modules tests

* Test that content is correct

* Create Multi Module Suite

* Add client-side navigation support for CSS

* Add tests for client-side nav

* Add some delays

* Try another fix

* Increase timeout to 3 minutes

* Fix test

* Give all unique directories