import type { Nullish } from './utils/null';
export interface HeadersInitEsque {
    [Symbol.iterator](): IterableIterator<[string, string]>;
}
export type HTTPHeaders = HeadersInitEsque | Record<string, string[] | string | undefined>;
export type AbortControllerEsque = new () => AbortControllerInstanceEsque;
/**
 * Allows you to abort one or more requests.
 */
export interface AbortControllerInstanceEsque {
    /**
     * The AbortSignal object associated with this object.
     */
    readonly signal: AbortSignal;
    /**
     * Sets this object's AbortSignal's aborted flag and signals to
     * any observers that the associated activity is to be aborted.
     */
    abort(): void;
}
export type HTTPLinkBaseOptions = {
    /**
     * Define AbortController implementation.
     */
    AbortController?: AbortControllerEsque | null;
    /**
     * Send all requests `as POST`s requests regardless of the procedure type.
     * The HTTP handler must separately allow overriding the method.
     *
     * @see https://trpc.io/docs/rpc
     */
    methodOverride?: 'POST';
};
export declare function getAbortController(abortControllerPolyfill?: AbortControllerEsque | Nullish): AbortControllerEsque | null;
export declare const httpQueryMethods: readonly ["get", "options", "head"];
export declare const httpMutationMethods: readonly ["post", "put", "patch", "delete"];
export declare const httpSubscriptionMethods: readonly ["connect", "subscribe"];
export declare const httpMethods: readonly ["get", "options", "head", "post", "put", "patch", "delete", "connect", "subscribe"];
/**
 * Recognized HTTP methods for queries.
 */
export type HttpQueryMethod = (typeof httpQueryMethods)[number];
/**
 * Recognized HTTP methods for mutations.
 */
export type HttpMutationMethod = (typeof httpMutationMethods)[number];
/**
 * Recognized HTTP methods for subscriptions.
 */
export type HttpSubscriptionMethod = (typeof httpSubscriptionMethods)[number];
/**
 * All recognized HTTP methods.
 */
export type HttMethod = (typeof httpMethods)[number];
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