/// <reference types="node" />
import { inspect } from "util";
import { File } from "./File";
/**
 * A `string` or `File` that represents a single value from a set of `FormData` key-value pairs.
 */
export declare type FormDataEntryValue = string | File;
/**
 * Constructor entries for FormData
 */
export declare type FormDataConstructorEntries = Array<{
    name: string;
    value: unknown;
    fileName?: string;
}>;
/**
 * Provides a way to easily construct a set of key/value pairs representing form fields and their values, which can then be easily sent using fetch().
 *
 * Note that this object is not a part of Node.js, so you might need to check if an HTTP client of your choice support spec-compliant FormData.
 * However, if your HTTP client does not support FormData, you can use [`form-data-encoder`](https://npmjs.com/package/form-data-encoder) package to handle "multipart/form-data" encoding.
 */
export declare class FormData {
    #private;
    static [Symbol.hasInstance](value: unknown): value is FormData;
    constructor(entries?: FormDataConstructorEntries);
    /**
     * Appends a new value onto an existing key inside a FormData object,
     * or adds the key if it does not already exist.
     *
     * The difference between `set()` and `append()` is that if the specified key already exists, `set()` will overwrite all existing values with the new one, whereas `append()` will append the new value onto the end of the existing set of values.
     *
     * @param name The name of the field whose data is contained in `value`.
     * @param value The field's value. This can be [`Blob`](https://developer.mozilla.org/en-US/docs/Web/API/Blob)
      or [`File`](https://developer.mozilla.org/en-US/docs/Web/API/File). If none of these are specified the value is converted to a string.
     * @param fileName The filename reported to the server, when a Blob or File is passed as the second parameter. The default filename for Blob objects is "blob". The default filename for File objects is the file's filename.
     */
    append(name: string, value: unknown, fileName?: string): void;
    /**
     * Set a new value for an existing key inside FormData,
     * or add the new field if it does not already exist.
     *
     * @param name The name of the field whose data is contained in `value`.
     * @param value The field's value. This can be [`Blob`](https://developer.mozilla.org/en-US/docs/Web/API/Blob)
      or [`File`](https://developer.mozilla.org/en-US/docs/Web/API/File). If none of these are specified the value is converted to a string.
     * @param fileName The filename reported to the server, when a Blob or File is passed as the second parameter. The default filename for Blob objects is "blob". The default filename for File objects is the file's filename.
     *
     */
    set(name: string, value: unknown, fileName?: string): void;
    /**
     * Returns the first value associated with a given key from within a `FormData` object.
     * If you expect multiple values and want all of them, use the `getAll()` method instead.
     *
     * @param {string} name A name of the value you want to retrieve.
     *
     * @returns A `FormDataEntryValue` containing the value. If the key doesn't exist, the method returns null.
     */
    get(name: string): FormDataEntryValue | null;
    /**
     * Returns all the values associated with a given key from within a `FormData` object.
     *
     * @param {string} name A name of the value you want to retrieve.
     *
     * @returns An array of `FormDataEntryValue` whose key matches the value passed in the `name` parameter. If the key doesn't exist, the method returns an empty list.
     */
    getAll(name: string): FormDataEntryValue[];
    /**
     * Returns a boolean stating whether a `FormData` object contains a certain key.
     *
     * @param name A string representing the name of the key you want to test for.
     *
     * @return A boolean value.
     */
    has(name: string): boolean;
    /**
     * Deletes a key and its value(s) from a `FormData` object.
     *
     * @param name The name of the key you want to delete.
     */
    delete(name: string): void;
    /**
     * Returns an [`iterator`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Iteration_protocols) allowing to go through all keys contained in this `FormData` object.
     * Each key is a `string`.
     */
    keys(): Generator<string>;
    /**
     * Returns an [`iterator`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Iteration_protocols) allowing to go through the `FormData` key/value pairs.
     * The key of each pair is a string; the value is a [`FormDataValue`](https://developer.mozilla.org/en-US/docs/Web/API/FormDataEntryValue).
     */
    entries(): Generator<[string, FormDataEntryValue]>;
    /**
     * Returns an [`iterator`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Iteration_protocols) allowing to go through all values contained in this object `FormData` object.
     * Each value is a [`FormDataValue`](https://developer.mozilla.org/en-US/docs/Web/API/FormDataEntryValue).
     */
    values(): Generator<FormDataEntryValue>;
    /**
     * An alias for FormData#entries()
     */
    [Symbol.iterator](): Generator<[string, FormDataEntryValue], any, unknown>;
    /**
     * Executes given callback function for each field of the FormData instance
     */
    forEach(callback: (value: FormDataEntryValue, key: string, form: FormData) => void, thisArg?: unknown): void;
    get [Symbol.toStringTag](): string;
    [inspect.custom](): string;
}