Add support for :where() (#1662)

Author: jathak

CHANGELOG.md

@@ -1,5 +1,9 @@
 ## 1.50.0
 
+* `@extend` now treats [`:where()`] the same as `:is()`.
+
+[`:where()`]: https://developer.mozilla.org/en-US/docs/Web/CSS/:where
+
 ### Command Line Interface
 
 * Closing the standard input stream will now cause the `--watch` command to stop

lib/src/extend/extension_store.dart

@@ -831,14 +831,15 @@ class ExtensionStore {
           // become `.foo:not(.bar)`. However, this is a narrow edge case and
           // supporting it properly would make this code and the code calling it
           // a lot more complicated, so it's not supported for now.
-          if (innerPseudo.normalizedName != 'is' &&
-              innerPseudo.normalizedName != 'matches') {
+          if (!const {'is', 'matches', 'where'}
+              .contains(innerPseudo.normalizedName)) {
             return [];
           }
           return innerSelector.components;
 
         case 'is':
         case 'matches':
+        case 'where':
         case 'any':
         case 'current':
         case 'nth-child':

lib/src/extend/functions.dart

@@ -24,6 +24,7 @@ import '../utils.dart';
 final _subselectorPseudos = {
   'is',
   'matches',
+  'where',
   'any',
   'nth-child',
   'nth-last-child'
@@ -747,6 +748,7 @@ bool _selectorPseudoIsSuperselector(
     case 'is':
     case 'matches':
     case 'any':
+    case 'where':
       var selectors = _selectorPseudoArgs(compound2, pseudo1.name);
       return selectors
               .any((selector2) => selector1.isSuperselector(selector2)) ||

lib/src/parse/selector.dart

@@ -15,6 +15,7 @@ final _selectorPseudoClasses = {
   "not",
   "is",
   "matches",
+  "where",
   "current",
   "any",
   "has",

pkg/sass_api/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 1.0.0-beta.41
+
+* No user-visible changes.
+
 ## 1.0.0-beta.40
 
 * No user-visible changes.

pkg/sass_api/pubspec.yaml

@@ -2,15 +2,15 @@ name: sass_api
 # Note: Every time we add a new Sass AST node, we need to bump the *major*
 # version because it's a breaking change for anyone who's implementing the
 # visitor interface(s).
-version: 1.0.0-beta.40
+version: 1.0.0-beta.41
 description: Additional APIs for Dart Sass.
 homepage: https://github.com/sass/dart-sass
 
 environment:
   sdk: '>=2.12.0 <3.0.0'
 
 dependencies:
-  sass: 1.49.11
+  sass: 1.50.0
 
 dependency_overrides:
   sass: {path: ../..}

pubspec.yaml

@@ -1,5 +1,5 @@
 name: sass
-version: 1.50.0-dev
+version: 1.50.0
 description: A Sass implementation in Dart.
 homepage: https://github.com/sass/dart-sass