import * as undici from 'undici';

interface $Fetch {
    <T = any, R extends ResponseType = "json">(request: FetchRequest, options?: FetchOptions<R>): Promise<MappedResponseType<R, T>>;
    raw<T = any, R extends ResponseType = "json">(request: FetchRequest, options?: FetchOptions<R>): Promise<FetchResponse<MappedResponseType<R, T>>>;
    native: Fetch;
    create(defaults: FetchOptions, globalOptions?: CreateFetchOptions): $Fetch;
}
interface FetchOptions<R extends ResponseType = ResponseType, T = any> extends Omit<RequestInit, "body">, FetchHooks<T, R> {
    baseURL?: string;
    body?: RequestInit["body"] | Record<string, any>;
    ignoreResponseError?: boolean;
    params?: Record<string, any>;
    query?: Record<string, any>;
    parseResponse?: (responseText: string) => any;
    responseType?: R;
    /**
     * @experimental Set to "half" to enable duplex streaming.
     * Will be automatically set to "half" when using a ReadableStream as body.
     * @see https://fetch.spec.whatwg.org/#enumdef-requestduplex
     */
    duplex?: "half" | undefined;
    /**
     * Only supported in Node.js >= 18 using undici
     *
     * @see https://undici.nodejs.org/#/docs/api/Dispatcher
     */
    dispatcher?: InstanceType<typeof undici.Dispatcher>;
    /**
     * Only supported older Node.js versions using node-fetch-native polyfill.
     */
    agent?: unknown;
    /** timeout in milliseconds */
    timeout?: number;
    retry?: number | false;
    /** Delay between retries in milliseconds. */
    retryDelay?: number | ((context: FetchContext<T, R>) => number);
    /** Default is [408, 409, 425, 429, 500, 502, 503, 504] */
    retryStatusCodes?: number[];
}
interface ResolvedFetchOptions<R extends ResponseType = ResponseType, T = any> extends FetchOptions<R, T> {
    headers: Headers;
}
interface CreateFetchOptions {
    defaults?: FetchOptions;
    fetch?: Fetch;
    Headers?: typeof Headers;
    AbortController?: typeof AbortController;
}
type GlobalOptions = Pick<FetchOptions, "timeout" | "retry" | "retryDelay">;
interface FetchContext<T = any, R extends ResponseType = ResponseType> {
    request: FetchRequest;
    options: ResolvedFetchOptions<R>;
    response?: FetchResponse<T>;
    error?: Error;
}
type MaybePromise<T> = T | Promise<T>;
type MaybeArray<T> = T | T[];
type FetchHook<C extends FetchContext = FetchContext> = (context: C) => MaybePromise<void>;
interface FetchHooks<T = any, R extends ResponseType = ResponseType> {
    onRequest?: MaybeArray<FetchHook<FetchContext<T, R>>>;
    onRequestError?: MaybeArray<FetchHook<FetchContext<T, R> & {
        error: Error;
    }>>;
    onResponse?: MaybeArray<FetchHook<FetchContext<T, R> & {
        response: FetchResponse<T>;
    }>>;
    onResponseError?: MaybeArray<FetchHook<FetchContext<T, R> & {
        response: FetchResponse<T>;
    }>>;
}
interface ResponseMap {
    blob: Blob;
    text: string;
    arrayBuffer: ArrayBuffer;
    stream: ReadableStream<Uint8Array>;
}
type ResponseType = keyof ResponseMap | "json";
type MappedResponseType<R extends ResponseType, JsonType = any> = R extends keyof ResponseMap ? ResponseMap[R] : JsonType;
interface FetchResponse<T> extends Response {
    _data?: T;
}
interface IFetchError<T = any> extends Error {
    request?: FetchRequest;
    options?: FetchOptions;
    response?: FetchResponse<T>;
    data?: T;
    status?: number;
    statusText?: string;
    statusCode?: number;
    statusMessage?: string;
}
type Fetch = typeof globalThis.fetch;
type FetchRequest = RequestInfo;
interface SearchParameters {
    [key: string]: any;
}

declare function createFetch(globalOptions?: CreateFetchOptions): $Fetch;

declare class FetchError<T = any> extends Error implements IFetchError<T> {
    constructor(message: string, opts?: {
        cause: unknown;
    });
}
interface FetchError<T = any> extends IFetchError<T> {
}
declare function createFetchError<T = any>(ctx: FetchContext<T>): IFetchError<T>;

export { type $Fetch as $, type CreateFetchOptions as C, FetchError as F, type GlobalOptions as G, type IFetchError as I, type MappedResponseType as M, type ResolvedFetchOptions as R, type SearchParameters as S, createFetchError as a, type FetchOptions as b, createFetch as c, type FetchContext as d, type FetchHook as e, type FetchHooks as f, type ResponseMap as g, type ResponseType as h, type FetchResponse as i, type Fetch as j, type FetchRequest as k };