type ConvertIdInput = string | number | boolean | null | undefined | readonly (string | number)[] | object;
/**
 * Converts an identifier to a string, particularly for composite keys.
 *
 * If the value is an object:
 * - An Array's elements are joined with a comma.
 * - Otherwise it is stringified to JSON.
 *
 * Non-object values are returned unchanged.
 *
 * @param value - The identifier to convert, which can be a primitive or a composite key object.
 * @returns The converted string for composite keys, or the original value if it's not an object.
 */
export declare function convertId(value: string | number | readonly (string | number)[]): string | number;
export declare function convertId(value: ConvertIdInput): string | number | boolean | null | undefined;
export {};