/**
 * CSV parsing and serialization utilities for Elo.
 *
 * CSV data is represented as an array of objects, where:
 * - Headers become object keys
 * - All values are kept as strings (Elo's type coercion handles conversion)
 */
/**
 * Parse a CSV string into an array of objects.
 * First row is treated as headers (keys for each row object).
 * All values are kept as strings.
 *
 * @param csv - The CSV string to parse
 * @returns An array of objects, one per data row
 *
 * @example
 * parseCSV('name,age\nAlice,30\nBob,25')
 * // => [{name: 'Alice', age: '30'}, {name: 'Bob', age: '25'}]
 */
export declare function parseCSV(csv: string): Record<string, string>[];
/**
 * Serialize a value to CSV format.
 *
 * For arrays of objects, the first object's keys become headers.
 * For a single object, it becomes a single-row CSV with headers.
 * For other values, an error is thrown.
 *
 * @param value - The value to serialize (array of objects, or single object)
 * @returns A CSV string
 *
 * @example
 * toCSV([{name: 'Alice', age: 30}, {name: 'Bob', age: 25}])
 * // => 'name,age\nAlice,30\nBob,25'
 *
 * toCSV({name: 'Alice', age: 30})
 * // => 'name,age\nAlice,30'
 */
export declare function toCSV(value: unknown): string;
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