/**
 * @file vToken
 * @desc These methods facilitate interactions with the vToken smart
 *     contracts.
 */
import { BigNumber } from '@ethersproject/bignumber/lib/bignumber';
import { CallOptions, TrxResponse } from './types';
/**
 * Supplies the user's Binance Smart Chain asset to the Venus Protocol.
 *
 * @param {string} asset A string of the asset to supply.
 * @param {number | string | BigNumber} amount A string, number, or BigNumber
 *     object of the amount of an asset to supply. Use the `mantissa` boolean in
 *     the `options` parameter to indicate if this value is scaled up (so there
 *     are no decimals) or in its natural scale.
 * @param {boolean} noApprove Explicitly prevent this method from attempting an
 *     BEP-20 `approve` transaction prior to sending the `mint` transaction.
 * @param {CallOptions} [options] Call options and Ethers.js overrides for the
 *     transaction. A passed `gasLimit` will be used in both the `approve` (if
 *     not supressed) and `mint` transactions.
 *
 * @returns {object} Returns an Ethers.js transaction object of the supply
 *     transaction.
 *
 * @example
 *
 * ```
 * const venus = new Venus(window.ethereum);
 *
 * // Ethers.js overrides are an optional 3rd parameter for `supply`
 * // const trxOptions = { gasLimit: 250000, mantissa: false };
 *
 * (async function() {
 *
 *   console.log('Supplying SXP to the Venus Protocol...');
 *   const trx = await venus.supply(Venus.SXP, 1);
 *   console.log('Ethers.js transaction object', trx);
 *
 * })().catch(console.error);
 * ```
 */
export declare function supply(asset: string, amount: string | number | BigNumber, noApprove?: boolean, options?: CallOptions): Promise<TrxResponse>;
/**
 * Redeems the user's Binance Smart Chain asset from the Venus Protocol.
 *
 * @param {string} asset A string of the asset to redeem, or its vToken name.
 * @param {number | string | BigNumber} amount A string, number, or BigNumber
 *     object of the amount of an asset to redeem. Use the `mantissa` boolean in
 *     the `options` parameter to indicate if this value is scaled up (so there
 *     are no decimals) or in its natural scale. This can be an amount of
 *     vTokens or underlying asset (use the `asset` parameter to specify).
 * @param {CallOptions} [options] Call options and Ethers.js overrides for the
 *     transaction.
 *
 * @returns {object} Returns an Ethers.js transaction object of the redeem
 *     transaction.
 *
 * @example
 *
 * ```
 * const venus = new Venus(window.ethereum);
 *
 * (async function() {
 *
 *   console.log('Redeeming SXP...');
 *   const trx = await venus.redeem(Venus.SXP, 1); // also accepts vToken args
 *   console.log('Ethers.js transaction object', trx);
 *
 * })().catch(console.error);
 * ```
 */
export declare function redeem(asset: string, amount: string | number | BigNumber, options?: CallOptions): Promise<TrxResponse>;
/**
 * Borrows an Binance Smart Chain asset from the Venus Protocol for the user.
 *     The user's address must first have supplied collateral and entered a
 *     corresponding market.
 *
 * @param {string} asset A string of the asset to borrow (must be a supported
 *     underlying asset).
 * @param {number | string | BigNumber} amount A string, number, or BigNumber
 *     object of the amount of an asset to borrow. Use the `mantissa` boolean in
 *     the `options` parameter to indicate if this value is scaled up (so there
 *     are no decimals) or in its natural scale.
 * @param {CallOptions} [options] Call options and Ethers.js overrides for the
 *     transaction.
 *
 * @returns {object} Returns an Ethers.js transaction object of the borrow
 *     transaction.
 *
 * @example
 *
 * ```
 * const venus = new Venus(window.ethereum);
 *
 * (async function() {
 *
 *   const sxpScaledUp = '32000000000000000000';
 *   const trxOptions = { mantissa: true };
 *
 *   console.log('Borrowing 32 SXP...');
 *   const trx = await venus.borrow(Venus.SXP, sxpScaledUp, trxOptions);
 *
 *   console.log('Ethers.js transaction object', trx);
 *
 * })().catch(console.error);
 * ```
 */
export declare function borrow(asset: string, amount: string | number | BigNumber, options?: CallOptions): Promise<TrxResponse>;
/**
 * Repays a borrowed Binance Smart Chain asset for the user or on behalf of
 *     another Binance Smart Chain address.
 *
 * @param {string} asset A string of the asset that was borrowed (must be a
 *     supported underlying asset).
 * @param {number | string | BigNumber} amount A string, number, or BigNumber
 *     object of the amount of an asset to borrow. Use the `mantissa` boolean in
 *     the `options` parameter to indicate if this value is scaled up (so there
 *     are no decimals) or in its natural scale.
 * @param {string | null} [borrower] The Binance Smart Chain address of the borrower
 *     to repay an open borrow for. Set this to `null` if the user is repaying
 *     their own borrow.
 * @param {boolean} noApprove Explicitly prevent this method from attempting an
 *     ERC-20 `approve` transaction prior to sending the subsequent repayment
 *     transaction.
 * @param {CallOptions} [options] Call options and Ethers.js overrides for the
 *     transaction. A passed `gasLimit` will be used in both the `approve` (if
 *     not supressed) and `repayBorrow` or `repayBorrowBehalf` transactions.
 *
 * @returns {object} Returns an Ethers.js transaction object of the repayBorrow
 *     or repayBorrowBehalf transaction.
 *
 * @example
 *
 * ```
 * const venus = new Venus(window.ethereum);
 *
 * (async function() {
 *
 *   console.log('Repaying SXP borrow...');
 *   const address = null; // set this to any address to repayBorrowBehalf
 *   const trx = await venus.repayBorrow(Venus.SXP, 32, address);
 *
 *   console.log('Ethers.js transaction object', trx);
 *
 * })().catch(console.error);
 * ```
 */
export declare function repayBorrow(asset: string, amount: string | number | BigNumber, borrower: string, noApprove?: boolean, options?: CallOptions): Promise<TrxResponse>;