/**
 * Convert a row record to CSV. Pure + testable — the CLI's `export --format csv`
 * delegates here.
 *
 * Nested objects/arrays are JSON-encoded (not collapsed to `[object Object]`),
 * so a product row with a `variants` array round-trips as valid JSON inside the
 * cell. `null`/`undefined` become empty cells. Values containing a comma, quote,
 * or newline are quoted with `"` doubled per RFC 4180.
 */
export declare function csvCell(val: unknown): string;
/** Serialize an array of row records to a CSV string (header + rows). */
export declare function toCsv(items: readonly Record<string, unknown>[]): string;