import type { SQLNode } from '../ast/node.js';
/**
 * SQL AST traversal visitor callback result.
 * A falsy value (including `undefined`, `null`, `false`, and `0`) indicates
 * that traversal should continue.
 * A negative number values indicates that traversal should stop immediately.
 * Any other truthy value indicates that traversal should not recurse on the
 * current node, but should otherwise continue.
 */
export type VisitorResult = boolean | number | null | undefined | void;
/**
 * SQL AST traversal callback function.
 */
export type VisitorCallback = (node: SQLNode) => VisitorResult;
/**
 * Perform a traversal of a SQL expression AST.
 * @param node Root node for AST traversal.
 * @param visit Visitor callback function.
 */
export declare function walk(node: unknown, visit: VisitorCallback): VisitorResult;
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