/**
 * SQL utilities for safe query construction.
 */
/**
 * SQL identifier regex - alphanumeric + underscore, must start with letter/underscore.
 */
export declare const SQL_IDENTIFIER_REGEX: RegExp;
/**
 * SQL clause with placeholder parameters.
 */
export interface SQLClause {
    sql: string;
    params: unknown[];
}
/**
 * Expand an array into individual ? placeholders for IN clause.
 *
 * LibSQL/SQLite doesn't support array parameters like PostgreSQL's ANY($1).
 * This helper expands arrays into individual placeholders.
 *
 * @example
 * expandArray(['a', 'b', 'c']) => { placeholders: '?, ?, ?', params: ['a', 'b', 'c'] }
 */
export declare function expandarray(arr: unknown[]): {
    placeholders: string;
    params: unknown[];
};
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