// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0;

/// @notice Interface for Euler eToken
interface IEToken {

    /// @notice Convert an eToken balance to an underlying amount, taking into account current exchange rate
    /// @param balance eToken balance, in internal book-keeping units (18 decimals)
    /// @return Amount in underlying units, (same decimals as underlying token)
    function convertBalanceToUnderlying(uint256 balance) external view returns (uint256);

    /// @notice Convert an underlying amount to an eToken balance, taking into account current exchange rate
    /// @param underlyingAmount Amount in underlying units (same decimals as underlying token)
    /// @return eToken balance, in internal book-keeping units (18 decimals)
    function convertUnderlyingToBalance(uint256 underlyingAmount) external view returns (uint256);
}