export declare function flatObject<E>(obj: E, pre?: string): E;
export declare function unflatObjects<T>(objects: T[]): T[];
export declare function obtainAttrsPaths<T>(row: T): {
    [k: string]: string[];
};
/**
 * Escape a SQL identifier (table name, column name, etc.)
 * @param val the identifier to escape
 * @param escapeIdChar the escape character to use (e.g. ` or ")
 * @param forbidQualified whether to forbid qualified identifiers (containing dots)
 * @param addDot whether to add a dot suffix
 */
export declare function escapeSqlId(val: string, escapeIdChar?: '`' | '"', forbidQualified?: boolean, addDot?: boolean): string;