Update CI and CONTRIBUTING to use Node spec runner

.github/workflows/ci.yml

@@ -44,13 +44,12 @@ jobs:
           PR_BRANCH: "${{ github.base_ref }}"
           CURRENT_REF: "${{ github.ref }}"
           PR_BODY: "${{ github.event.pull_request.body }}"
-      - uses: ruby/setup-ruby@v1
-        with:
-          ruby-version: 2.6
-          working-directory: sass-spec
-          bundler-cache: true
+      - uses: actions/setup-node@v2
+        with: {node-version: "${{ env.DEFAULT_NODE_VERSION }}"}
+      - run: npm install
+        working-directory: sass-spec
       - name: Run specs
-        run: bundle exec sass-spec.rb --dart .. $extra_args
+        run: npm run sass-spec -- --dart .. $extra_args
         working-directory: sass-spec
         env: {extra_args: "${{ matrix.async_args }}"}
 

CONTRIBUTING.md

@@ -44,8 +44,8 @@ one above, the
 2. In this repository, run `pub get`. This will install all of the Dart
    dependencies.
 
-3. [Install Node.js][]. This is only necessary if you're making changes to Dart
-   Sass's Node API.
+3. [Install Node.js][]. This is only necessary if you're making changes to the
+  language or to Dart Sass's Node API.
 
 [Install the Dart SDK]: https://www.dartlang.org/install
 [Install Node.js]: https://nodejs.org/en/download/
@@ -91,13 +91,13 @@ To create a new spec:
 
 * [Fork sass-spec](https://help.github.com/articles/fork-a-repo/).
 
-* Install [Ruby][] and [Bundler][].
+* [Install Node.js][] v14.14 or newer.
 
 * ```sh
   # Replace $USER with your GitHub username.
   git clone https://github.com/$USER/sass-spec
   cd sass-spec
-  bundle install
+  npm install
   ```
 
 * For each test case you want to add:
@@ -108,18 +108,16 @@ To create a new spec:
 
   * Following the [spec style guide][], create an `hrx` file that exercises your
     language change, verifying that the change produces expected output/errors.
-    
+
     [spec style guide]: https://github.com/sass/sass-spec/blob/master/STYLE_GUIDE.md
 
 * If you're adding a new language feature, it probably won't be supported by
-  Ruby Sass or LibSass yet. You can indicate this and keep tests passing by
-  adding an `options.yml` file like this to the directory containing your
-  tests:
+  LibSass yet. You can indicate this and keep tests passing by adding an
+  `options.yml` file like this to the directory containing your tests:
 
   ```yaml
   ---
   :todo:
-  - ruby-sass
   - libsass
   ```
 
@@ -131,16 +129,16 @@ To create a new spec:
 
   ```sh
   # Replace .. with the path to dart-sass if it's not the parent directory.
-  bundle exec sass-spec.rb --dart ..
+  npm run sass-spec -- --dart ..
   ```
 
   * You can also run specs within a single directory:
 
     ```sh
-    bundle exec sass-spec.rb --dart .. spec/my/new/feature
+    npm run sass-spec --dart .. spec/my/new/feature
     ```
 
-  * If you pass the `--interactive` flag, `sass-spec.rb` will stop each time a
+  * If you pass the `--interactive` flag, the spec runner will stop each time a
     spec fails and ask you what to do about the failure.
 
 * Once you've added specs and they're passing for Dart Sass, create a pull
@@ -152,9 +150,6 @@ To create a new spec:
   request at the end of the message. This tells Dart Sass to test against your
   new sass-spec tests.
 
-[Ruby]: https://www.ruby-lang.org/en/
-[Bundler]: http://bundler.io/
-
 ### Changing the Node API
 
 Most of Dart Sass's code is shared between Dart and Node.js, but the API that's
@@ -209,7 +204,7 @@ automating.
 All files in the project must start with the following header.
 
 ```dart
-// Copyright (c) 2018, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
+// Copyright 2021 Google LLC. Use of this source code is governed by an
+// MIT-style license that can be found in the LICENSE file or at
+// https://opensource.org/licenses/MIT.
 ```