/**
 * Backpressure-safe incremental stdout writer.
 *
 * Used for streaming ndjson and csv output of large result sets
 * without buffering everything in memory.
 */
/**
 * Write a string to stdout, handling backpressure.
 *
 * Returns a promise that resolves when the data has been flushed
 * or the stream has drained.
 */
export declare function writeStdout(data: string): Promise<void>;
/**
 * Stream ndjson records — one JSON object per line.
 * Memory-efficient for large result sets.
 */
export declare function streamNdjson(records: Record<string, any>[]): Promise<void>;
/**
 * Stream CSV rows incrementally.
 * Caller is responsible for writing the header first.
 */
export declare function streamCsvRows(rows: string[][], separator?: string): Promise<void>;
/**
 * Escape a single CSV cell value.
 * Wraps in quotes if the value contains comma, quote, or newline.
 */
export declare function toCsvCell(value: unknown): string;
/**
 * Format a row of values as a CSV line (no trailing newline).
 */
export declare function toCsvRow(cells: unknown[], separator?: string): string;
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