import { ProviderInterface, ProviderInterface$Callback, ProviderInterface$Emitted, ProviderInterface$EmitCb } from '../types';
import './polyfill';
/**
 * The HTTP Provider allows sending requests using HTTP. it does not support subscriptions
 * so you won´t be able to listen to events such as new blocks or balance changes.
 * It is usually preferrable using the [[WsProvider]].
 *
 * @example
 * import createApi from '@polkadot/api';
 * import WsProvider from '@polkadot/api-provider/ws';
 *
 * const provider = new WsProvider('http://127.0.0.1:9933');
 * const api = createApi(provider);
 *
 * @see [[WsProvider]]
 */
export default class HttpProvider implements ProviderInterface {
    private coder;
    private endpoint;
    private l;
    constructor(endpoint: string);
    /**
     * Whether the node is connected or not.
     * @return {boolean} true if connected
     */
    isConnected(): boolean;
    /**
     * Events are not supported with the HttpProvider, see [[WsProvider]].
     */
    on(type: ProviderInterface$Emitted, sub: ProviderInterface$EmitCb): void;
    send(method: string, params: Array<any>): Promise<any>;
    /**
     * Subscriptions are not supported with the HttpProvider, see [[WsProvider]].
     */
    subscribe(types: string, method: string, params: Array<any>, cb: ProviderInterface$Callback): Promise<number>;
    /**
     * Subscriptions are not supported with the HttpProvider, see [[WsProvider]].
     */
    unsubscribe(type: string, method: string, id: number): Promise<boolean>;
}