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+/**
+ * @fileoverview Visitor keys for the CSS Tree AST.
+ * @author Nicholas C. Zakas
+ */
+export const visitorKeys = {
+    AnPlusB: [],
+    Atrule: ["prelude", "block"],
+    AtrulePrelude: ["children"],
+    AttributeSelector: ["name", "value"],
+    Block: ["children"],
+    Brackets: ["children"],
+    CDC: [],
+    CDO: [],
+    ClassSelector: [],
+    Combinator: [],
+    Comment: [],
+    Condition: ["children"],
+    Declaration: ["value"],
+    DeclarationList: ["children"],
+    Dimension: [],
+    Feature: ["value"],
+    FeatureFunction: ["value"],
+    FeatureRange: ["left", "middle", "right"],
+    Function: ["children"],
+    GeneralEnclosed: ["children"],
+    Hash: [],
+    IdSelector: [],
+    Identifier: [],
+    Layer: [],
+    LayerList: ["children"],
+    MediaQuery: ["condition"],
+    MediaQueryList: ["children"],
+    NestingSelector: [],
+    Nth: ["nth", "selector"],
+    Number: [],
+    Operator: [],
+    Parentheses: ["children"],
+    Percentage: [],
+    PseudoClassSelector: ["children"],
+    PseudoElementSelector: ["children"],
+    Ratio: ["left", "right"],
+    Raw: [],
+    Rule: ["prelude", "block"],
+    Scope: ["root", "limit"],
+    Selector: ["children"],
+    SelectorList: ["children"],
+    String: [],
+    StyleSheet: ["children"],
+    SupportsDeclaration: ["declaration"],
+    TypeSelector: [],
+    UnicodeRange: [],
+    Url: [],
+    Value: ["children"],
+    WhiteSpace: [],
+};