import { type FoldRule, type IdentKind } from "../ident/fold.js";
import type { QualifiedNameConfig } from "../ir/qualified-name.js";
export declare const DUCKDB_FOLD_RULE: FoldRule;
/** catalog.schema.table — an attached database is a catalog
 *  (duckdb.org/docs/current/sql/statements/attach). */
export declare const DUCKDB_NAME_CONFIG: QualifiedNameConfig;
/** Fold an identifier to its DuckDB identity key. */
export declare function fold(raw: string, kind?: IdentKind): string;
/** Presentation twin: strip delimiters, no case change. */
export declare function displayName(raw: string): string;
export declare function foldTableName(parts: string[]): string[];
export declare function matchesSourceKey(key: string, rawPart: string): boolean;