/**
 * A value in the text form of a `pg_node_tree`: a scalar token, `null` for
 * `<>`, a list, or a node. Integer, OID and bitmapset lists (`(i 1 2)`,
 * `(o 23)`, `(b 3)`) lose their marker and become lists of scalar tokens.
 */
export type NodeTreeValue = string | null | NodeTreeValue[] | NodeTreeNode;
export interface NodeTreeNode {
    type: string;
    fields: Record<string, NodeTreeValue>;
}
/**
 * Parse the text form of a `pg_node_tree` (for example
 * `pg_rewrite.ev_action::text`), following the tokenizer of PostgreSQL's
 * `read.c`: tokens are separated by whitespace, `(`, `)`, `{` and `}` are
 * tokens of their own, and a backslash escapes the next character.
 */
export declare function parseNodeTree(text: string): NodeTreeValue;
export declare function isNode(value: NodeTreeValue | undefined, type?: string): value is NodeTreeNode;