import type { JsonRpcMiddleware } from '@metamask/json-rpc-engine';
import { type Json, type JsonRpcParams } from '@metamask/utils';
import type { AbstractRpcServiceLike, InfuraJsonRpcSupportedNetwork } from './types';
/**
 * A simplified version of the `HeadersInit` type from the Fetch API.
 *
 * We purposefully do not use that type because we don't want to accidentally
 * rely on browser-only APIs in this package.
 */
declare type Headers = Record<string, string>;
export declare type CreateInfuraMiddlewareOptions = {
    network?: InfuraJsonRpcSupportedNetwork;
    maxAttempts?: number;
    source?: string;
    projectId: string;
    headers?: Headers;
};
/**
 * Creates middleware for sending a JSON-RPC request through the given RPC
 * service.
 * @param args - The arguments to this function.
 * @param args.rpcService - The RPC service to use.
 * @param args.options - Options.
 * @param args.options.source - A descriptor for the entity making the request;
 * tracked by Infura for analytics purposes.
 * @param args.options.headers - Extra headers to include in the request.
 * @returns The fetch middleware.
 */
export declare function createInfuraMiddleware(args: {
    rpcService: AbstractRpcServiceLike;
    options?: {
        source?: string;
        headers?: Headers;
    };
}): JsonRpcMiddleware<JsonRpcParams, Json>;
/**
 * Builds [`@metamask/json-rpc-engine`](https://github.com/MetaMask/@metamask/json-rpc-engine)-compatible middleware designed
 * for interfacing with Infura's JSON-RPC endpoints.
 * @deprecated This overload is deprecated — please pass an `RpcService`
 * instance from `@metamask/network-controller` instead.
 * @param args - The arguments to this function.
 * @param args.network - A network that Infura supports; plugs into
 * `https://${network}.infura.io` (default: 'mainnet').
 * @param args.maxAttempts - The number of times a request to Infura should be
 * retried in the case of failure (default: 5).
 * @param args.source - A descriptor for the entity making the request; tracked
 * by Infura for analytics purposes.
 * @param args.projectId - The Infura project id.
 * @param args.headers - Extra headers that will be used to make the request.
 * @returns The `@metamask/json-rpc-engine`-compatible middleware.
 */
export declare function createInfuraMiddleware(args: CreateInfuraMiddlewareOptions): JsonRpcMiddleware<JsonRpcParams, Json>;
/**
 * Builds [`@metamask/json-rpc-engine`](https://github.com/MetaMask/@metamask/json-rpc-engine)-compatible middleware designed
 * for interfacing with Infura's JSON-RPC endpoints.
 * @param opts - The options.
 * @param opts.network - A network that Infura supports; plugs into
 * `https://${network}.infura.io` (default: 'mainnet').
 * @param opts.maxAttempts - The number of times a request to Infura should be
 * retried in the case of failure (default: 5).
 * @param opts.source - A descriptor for the entity making the request; tracked
 * by Infura for analytics purposes.
 * @param opts.projectId - The Infura project id.
 * @param opts.headers - Extra headers that will be used to make the request.
 * @returns The `@metamask/json-rpc-engine`-compatible middleware.
 */
export declare function createInfuraMiddlewareWithoutRpcService({ network, maxAttempts, source, projectId, headers, }: CreateInfuraMiddlewareOptions): JsonRpcMiddleware<JsonRpcParams, Json>;
export {};