import { ProviderInterface, ProviderInterface$Callback, ProviderInterface$Emitted, ProviderInterface$EmitCb } from '../types';
import './polyfill';
/**
 * @name HttpProvider
 * @summary The HTTP Provider allows sending requests using HTTP to a HTTP RPC server TCP port.
 * @description It does not support subscriptions so you won't be able to listen to events
 * such as new blocks or balance changes. It is usually preferrable using the [[WsProvider]].
 *
 * @example
 * <BR>
 *
 * ```javascript
 * import Api from '@polkadot/api';
 * import HttpProvider from '@polkadot/api-provider/http';
 *
 * const provider = new HttpProvider('http://127.0.0.1:9933');
 * const api = new Api(provider);
 * ```
 *
 * @see [[WsProvider]]
 */
export default class HttpProvider implements ProviderInterface {
    private coder;
    private endpoint;
    private l;
    /**
     * @param {string} endpoint The endpoint url starting with http://
     */
    constructor(endpoint: string);
    /**
     * @summary Whether the node is connected or not.
     * @return {boolean} true if connected
     */
    isConnected(): boolean;
    /**
     * @summary Events are not supported with the HttpProvider, see [[WsProvider]].
     * @description HTTP Provider does not have 'on' emitters. WebSockets should be used instead.
     */
    on(type: ProviderInterface$Emitted, sub: ProviderInterface$EmitCb): void;
    /**
     * @summary Send HTTP POST Request with Body to configured HTTP Endpoint.
     */
    send(method: string, params: Array<any>): Promise<any>;
    /**
     * @summary Subscriptions are not supported with the HttpProvider, see [[WsProvider]].
     */
    subscribe(types: string, method: string, params: Array<any>, cb: ProviderInterface$Callback): Promise<number>;
    /**
     * @summary Subscriptions are not supported with the HttpProvider, see [[WsProvider]].
     */
    unsubscribe(type: string, method: string, id: number): Promise<boolean>;
}