import { type Cluster, Connection } from '@solana/web3.js';
/**
 * Example:
 * ```
 * setCluster('devnet');
 * var connection = getConnection();
 *
 * var connection = setCluster(null, `https://mainnet.helius-rpc.com/?api-key=${key}`);
 * ```
 * @see {@link getConnection}
 */
export declare function setCluster(cluster?: Cluster | null, customEndpoint?: string): Connection;
/**
 * Get a web3 connection, default cluster: mainnet-beta.
 *
 * Use `setCluster('devnet')` to change cluster.
 */
export declare function getConnection(): Connection;