/**
 * The default delay used with APIs not providing rate limit headers.
 *
 * @internal
 */
export declare const UNKNOWN_RATE_LIMIT_DELAY = 1500;
/**
 * A universal API to make network requests. A subset of the `fetch()` API.
 *
 * {@link https://developer.mozilla.org/en-US/docs/Web/API/fetch}
 */
export type FetchLike = (input: string, init?: RequestInitLike) => Promise<ResponseLike>;
/**
 * An object that allows you to abort a `fetch()` request if needed via an
 * `AbortController` object
 *
 * {@link https://developer.mozilla.org/en-US/docs/Web/API/AbortSignal}
 */
export type AbortSignalLike = any;
/**
 * A subset of RequestInit properties to configure a `fetch()` request.
 */
export interface RequestInitLike extends Pick<RequestInit, "cache"> {
    /**
     * The HTTP method to use for the request.
     */
    method?: string;
    /**
     * The request body to send with the request.
     */
    body?: any | FormData | string;
    /**
     * An object literal to set the `fetch()` request's headers.
     */
    headers?: Record<string, string>;
    /**
     * An AbortSignal to set the `fetch()` request's signal.
     *
     * See:
     * [https://developer.mozilla.org/en-US/docs/Web/API/AbortSignal](https://developer.mozilla.org/en-US/docs/Web/API/AbortSignal)
     */
    signal?: AbortSignalLike;
}
/**
 * The minimum required properties from Response.
 */
export interface ResponseLike {
    ok: boolean;
    status: number;
    headers: HeadersLike;
    json(): Promise<any>;
    text(): Promise<string>;
    blob(): Promise<Blob>;
}
/**
 * The minimum required properties from Headers.
 */
export interface HeadersLike {
    get(name: string): string | null;
}
/**
 * The minimum required properties to treat as an HTTP Request for automatic
 * Prismic preview support.
 */
export type HttpRequestLike = /**
 * Web API Request
 *
 * @see http://developer.mozilla.org/en-US/docs/Web/API/Request
 */ {
    headers?: {
        get(name: string): string | null;
    };
    url?: string;
}
/**
 * Express-style Request
 */
 | {
    headers?: {
        cookie?: string;
    };
    query?: Record<string, unknown>;
};
/**
 * Configuration for clients that determine how APIs are queried.
 */
export type BaseClientConfig = {
    /**
     * The function used to make network requests to the Prismic REST API. In
     * environments where a global `fetch` function does not exist, such as
     * Node.js, this function must be provided.
     */
    fetch?: FetchLike;
    /**
     * Options provided to the client's `fetch()` on all network requests. These
     * options will be merged with internally required options. They can also be
     * overriden on a per-query basis using the query's `fetchOptions` parameter.
     */
    fetchOptions?: RequestInitLike;
};
/**
 * Parameters for any client method that use `fetch()`.
 */
export type FetchParams = {
    /**
     * Options provided to the client's `fetch()` on all network requests. These
     * options will be merged with internally required options. They can also be
     * overriden on a per-query basis using the query's `fetchOptions` parameter.
     */
    fetchOptions?: RequestInitLike;
    /**
     * An `AbortSignal` provided by an `AbortController`. This allows the network
     * request to be cancelled if necessary.
     *
     * @deprecated Move the `signal` parameter into `fetchOptions.signal`:
     *
     * @see \<https://developer.mozilla.org/en-US/docs/Web/API/AbortSignal\>
     */
    signal?: AbortSignalLike;
};
/**
 * The result of a `fetch()` job.
 */
type FetchJobResult<TJSON = any> = {
    status: number;
    headers: HeadersLike;
    json: TJSON;
    text?: string;
};
export declare abstract class BaseClient {
    /**
     * The function used to make network requests to the Prismic REST API. In
     * environments where a global `fetch` function does not exist, such as
     * Node.js, this function must be provided.
     */
    fetchFn: FetchLike;
    fetchOptions?: RequestInitLike;
    /**
     * Active queued `fetch()` jobs keyed by URL and AbortSignal (if it exists).
     */
    private queuedFetchJobs;
    /**
     * Active deduped `fetch()` jobs keyed by URL and AbortSignal (if it exists).
     */
    private dedupedFetchJobs;
    constructor(options: BaseClientConfig);
    protected fetch(url: string, params?: FetchParams): Promise<FetchJobResult>;
    private queueFetch;
    private dedupeFetch;
    private createFetchJob;
}
export {};