import type { Wretch, WretchAddon } from "../types.js";
/**
 * Options for the formData method.
 */
export type FormDataOptions = {
    /**
     * Enable recursion through nested objects to produce `object[key]` keys.
     * When set to `true`, all nested objects will be recursively converted.
     * When set to an array of strings, the specified keys will be excluded from recursion.
     */
    recursive?: string[] | boolean;
};
export interface FormDataAddon {
    /**
     * Converts the javascript object to a FormData and sets the request body.
     *
     * ```js
     * const form = {
     *   hello: "world",
     *   duck: "Muscovy",
     * };
     *
     * wretch("...").addons(FormDataAddon).formData(form).post();
     * ```
     *
     * The `recursive` option when set to `true` will enable recursion through all
     * nested objects and produce `object[key]` keys. It can be set to an array of
     * string to exclude specific keys.
     *
     * > Warning: Be careful to exclude `Blob` instances in the Browser, and
     * > `ReadableStream` and `Buffer` instances when using the node.js compatible
     * > `form-data` package.
     *
     * ```js
     * const form = {
     *   duck: "Muscovy",
     *   duckProperties: {
     *     beak: {
     *       color: "yellow",
     *     },
     *     legs: 2,
     *   },
     *   ignored: {
     *     key: 0,
     *   },
     * };
     *
     * // Will append the following keys to the FormData payload:
     * // "duck", "duckProperties[beak][color]", "duckProperties[legs]"
     * wretch("...").addons(FormDataAddon).formData(form, { recursive: ["ignored"] }).post();
     * ```
     *
     * > Note: This addon does not support specifying a custom `filename`.
     * > If you need to do so, you can use the `body` method directly:
     * > ```js
     * > const form = new FormData();
     * > form.append("hello", "world", "hello.txt");
     * > wretch("...").body(form).post();
     * > ```
     * > See: https://developer.mozilla.org/en-US/docs/Web/API/FormData/append#example
     *
     * @param formObject - An object which will be converted to a FormData
     * @param options - Optional configuration object
     */
    formData<T extends FormDataAddon, C, R, E>(this: T & Wretch<T, C, R, E>, formObject: object, options?: FormDataOptions): this;
}
/**
 * Adds the ability to convert a an object to a FormData and use it as a request body.
 *
 * ```js
 * import FormDataAddon from "wretch/addons/formData"
 *
 * wretch().addon(FormDataAddon)
 * ```
 */
declare const formData: WretchAddon<FormDataAddon>;
export default formData;