import { FormDataAdapter } from '../../adapters/types';
/**
 * Converts a plain object to a FormData instance.
 *
 * - If the value is an array:
 *   - An empty array appends a null.
 *   - Otherwise the array is split into file parts and non-file parts (per `formDataAdapter.isFilePart`).
 *     - Each file part is appended separately under the same key via `formDataAdapter.appendFile`.
 *     - Non-file parts are appended as a JSON string.
 * - An object (excluding file parts) is appended as a JSON string.
 * - Otherwise the value is appended as-is.
 *
 * @param data - The object containing key-value pairs to be converted.
 * @param formDataAdapter - Platform adapter used to detect and append file parts (web: `File`; RN: a `{ uri, name, type }` shape).
 * @returns A FormData instance populated with the processed data.
 */
export declare const convertToFormData: <T extends object>(data: T, formDataAdapter: FormDataAdapter) => FormData;