aave-protocol-v2/contracts/interfaces/ISwapAdapter.sol

// SPDX-License-Identifier: agpl-3.0
pragma solidity ^0.6.8;

interface ISwapAdapter {

    /** 
     * @dev Swaps an `amountToSwap` of an asset to another, approving a `fundsDestination` to pull the funds
     * @param assetToSwapFrom Origin asset
     * @param assetToSwapTo Destination asset
     * @param amountToSwap How much `assetToSwapFrom` needs to be swapped
     * @param fundsDestination Address that will be pulling the swapped funds
     * @param params Additional variadic field to include extra params
     */
    function executeOperation(
        address assetToSwapFrom,
        address assetToSwapTo,
        uint256 amountToSwap,
        address fundsDestination,
        bytes calldata params
    ) external;
}