import { SqlOperation } from '../types/query';
/**
 * Detect the SQL operation type from the query text.
 */
export declare function detectOperation(sql: string): SqlOperation;
/**
 * Extract the primary table name from a SQL statement.
 * Handles quoted identifiers (backtick, double-quote, square bracket).
 */
export declare function extractPrimaryTable(sql: string): string;
/**
 * Extract all column names referenced in WHERE, ORDER BY, GROUP BY, JOIN ON.
 * Returns a deduplicated lowercase array.
 */
export declare function extractReferencedColumns(sql: string): string[];
/**
 * Truncate a long SQL string to maxLen chars for display purposes.
 */
export declare function truncateSql(sql: string, maxLen?: number): string;
/**
 * Mask likely sensitive literals (numbers after = and quoted strings).
 * Useful before sending queries to external AI endpoints.
 */
export declare function maskSensitiveLiterals(sql: string): string;
//# sourceMappingURL=sqlParser.d.ts.map