/**
 * CSV formatter for CLI
 * Streams CSV with header row and proper escaping
 *
 * Limitations (explicit):
 * - Nested objects are flattened with dot notation
 * - Array fields cause an error (not flattened)
 * - Field order follows first record's key order
 */
import type { OutputWriter } from '../utils/output.js';
/**
 * CSV writer that handles streaming
 */
export declare class CsvWriter {
    private headers;
    private readonly writer;
    constructor(writer: OutputWriter);
    /**
     * Write a single record as CSV row
     * First call establishes header order
     */
    writeRow(record: Record<string, unknown>): void;
}
/**
 * Format entire array as CSV (for non-streaming use)
 */
export declare function formatCsv(data: unknown[], writer: OutputWriter): void;
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