import type { Expression } from "./nodes.js";
export interface AstVisitor {
    /**
     * Called before a node's children are visited.
     * Return `false` to prevent the walker from recursing into this node's children.
     */
    enter?: (node: Expression) => void | false;
    /**
     * Called after a node's children have been visited.
     */
    leave?: (node: Expression) => void;
}
/**
 * Recursively walks an Edict expression tree.
 * Guarantees traversal over all child expressions.
 */
export declare function walkExpression(expr: Expression, visitor: AstVisitor | ((node: Expression) => void)): void;
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