grammars/source.dart.json in github-linguist-7.6.1 vs grammars/source.dart.json in github-linguist-7.7.0

@@ -230,10 +230,10 @@
           "name": "keyword.control.new.dart",
           "match": "(?\u003c!\\$)\\b(new)\\b(?!\\$)"
         },
         {
           "name": "keyword.declaration.dart",
-          "match": "(?\u003c!\\$)\\b(abstract|class|enum|extends|external|factory|implements|get|mixin|native|operator|set|typedef|with|covariant)\\b(?!\\$)"
+          "match": "(?\u003c!\\$)\\b(abstract|class|enum|extends|extension|external|factory|implements|get|mixin|native|operator|set|typedef|with|covariant)\\b(?!\\$)"
         },
         {
           "name": "keyword.operator.dart",
           "match": "(?\u003c!\\$)\\b(is\\!?)\\b(?!\\$)"
         },