import { IRNode } from "../types.js";
/**
 * Recursively walks an IR tree, visiting each node and optionally replacing it.
 * Returns the (potentially replaced) root node.
 *
 * @param visitor Return an IRNode to replace the current node, or void/null to keep it.
 * @param order   'pre' visits before children; 'post' (default) visits after children.
 */
export declare function walkIR(ir: IRNode, visitor: (node: IRNode) => IRNode | void | null, order?: "pre" | "post"): IRNode;