/**
 * @file Ethereum
 * @desc These methods facilitate interactions with the Ethereum blockchain.
 */
import { CallOptions, Provider, ProviderNetwork } from './types';
/**
 * This is a generic method for invoking JSON RPC's `eth_call` with Ethers.js.
 *     Use this method to execute a smart contract's constant or non-constant
 *     member without using gas. This is a read-only method intended to read a
 *     value or test a transaction for valid parameters. It does not create a
 *     transaction on the block chain.
 *
 * @param {string} address The Ethereum address the transaction is directed to.
 * @param {string} method The smart contract member in which to invoke.
 * @param {any[]} [parameters] Parameters of the method to invoke.
 * @param {CallOptions} [options] Options to set for `eth_call`, optional ABI
 *     (as JSON object), and Ethers.js method overrides. The ABI can be a string
 *     of the single intended method, an array of many methods, or a JSON object
 *     of the ABI generated by a Solidity compiler.
 *
 * @returns {Promise<any>} Return value of the invoked smart contract member or an error
 *     object if the call failed.
 *
 * @example
 * ```
 * const vBnbAddress = Venus.util.getAddress(Venus.vBNB);
 *
 * (async function() {
 *
 *   const srpb = await Venus.eth.read(
 *     vBnbAddress,
 *     'function supplyRatePerBlock() returns (uint256)',
 *     // [], // [optional] parameters
 *     // {}  // [optional] call options, provider, network, plus Ethers.js "overrides"
 *   );
 *
 *   console.log('vBNB market supply rate per block:', srpb.toString());
 *
 * })().catch(console.error);
 * ```
 */
export declare function read(address: string, method: string, parameters?: any[], options?: CallOptions): Promise<any>;
/**
 * This is a generic method for invoking JSON RPC's `eth_sendTransaction` with
 *     Ethers.js. Use this method to create a transaction that invokes a smart
 *     contract method. Returns an Ethers.js `TransactionResponse` object.
 *
 * @param {string} address The Ethereum address the transaction is directed to.
 * @param {string} method The smart contract member in which to invoke.
 * @param {any[]} [parameters] Parameters of the method to invoke.
 * @param {CallOptions} [options] Options to set for `eth_sendTransaction`,
 *     (as JSON object), and Ethers.js method overrides. The ABI can be a string
 *     optional ABI of the single intended method, an array of many methods, or
 *     a JSON object of the ABI generated by a Solidity compiler.
 *
 * @returns {Promise<any>} Returns an Ethers.js `TransactionResponse` object or an error
 *     object if the transaction failed.
 *
 * @example
 * ```
 * const oneEthInWei = '1000000000000000000';
 * const vBnbAddress = '0x4ddc2d193948926d02f9b1fe9e1daa0718270ed5';
 * const provider = window.ethereum;
 *
 * (async function() {
 *   console.log('Supplying BNB to the Venus Protocol...');
 *
 *   // Mint some vBNB by supplying BNB to the Venus Protocol
 *   const trx = await Venus.eth.trx(
 *     vBnbAddress,
 *     'function mint() payable',
 *     [],
 *     {
 *       provider,
 *       value: oneEthInWei
 *     }
 *   );
 *
 *   // const result = await trx.wait(1); // JSON object of trx info, once mined
 *
 *   console.log('Ethers.js transaction object', trx);
 * })().catch(console.error);
 * ```
 */
export declare function trx(address: string, method: string, parameters?: any[], options?: CallOptions): Promise<any>;
/**
 * This helps the Venus.js constructor discover which Ethereum network the
 *     developer wants to use.
 *
 * @param {Provider | string} [provider] Optional Ethereum network provider.
 *     Defaults to Ethers.js fallback mainnet provider.
 *
 * @hidden
 *
 * @returns {object} Returns a metadata object containing the Ethereum network
 *     name and ID.
 */
export declare function getProviderNetwork(provider: Provider): Promise<ProviderNetwork>;
/**
 * Fetches the current Ether balance of a provided Ethereum address.
 *
 * @param {string} address The Ethereum address in which to get the BNB balance.
 * @param {Provider | string} [provider] Optional Ethereum network provider.
 *     Defaults to Ethers.js fallback mainnet provider.
 *
 * @returns {BigNumber} Returns a BigNumber hexadecimal value of the BNB balance
 *     of the address.
 *
 * @example
 * ```
 * (async function () {
 *
 *   balance = await Venus.eth.getBalance(myAddress, provider);
 *   console.log('My BNB Balance', +balance);
 *
 * })().catch(console.error);
 * ```
 */
export declare function getBalance(address: string, provider: Provider | string): Promise<string>;
/**
 * Creates an Ethereum network provider object.
 *
 * @param {CallOptions} options The call options of a pending Ethereum
 *     transaction.
 *
 * @hidden
 *
 * @returns {object} Returns a valid Ethereum network provider object.
 */
export declare function _createProvider(options?: CallOptions): Provider;