function factory() external pure returns (address);

function WETH() external pure returns (address);

function addLiquidity(
    address tokenA,
    address tokenB,
    uint256 amountADesired,
    uint256 amountBDesired,
    uint256 amountAMin,
    uint256 amountBMin,
    address to,
    uint256 deadline
) external returns (uint256 amountA, uint256 amountB, uint256 liquidity);

function addLiquidityETH(
    address token,
    uint256 amountTokenDesired,
    uint256 amountTokenMin,
    uint256 amountETHMin,
    address to,
    uint256 deadline
) external payable returns (uint256 amountToken, uint256 amountETH, uint256 liquidity);

function removeLiquidity(
    address tokenA,
    address tokenB,
    uint256 liquidity,
    uint256 amountAMin,
    uint256 amountBMin,
    address to,
    uint256 deadline
) external returns (uint256 amountA, uint256 amountB);

function removeLiquidityETH(
    address token,
    uint256 liquidity,
    uint256 amountTokenMin,
    uint256 amountETHMin,
    address to,
    uint256 deadline
) external returns (uint256 amountToken, uint256 amountETH);

function removeLiquidityWithPermit(
    address tokenA,
    address tokenB,
    uint256 liquidity,
    uint256 amountAMin,
    uint256 amountBMin,
    address to,
    uint256 deadline,
    bool approveMax,
    uint8 v,
    bytes32 r,
    bytes32 s
) external returns (uint256 amountA, uint256 amountB);

function removeLiquidityETHWithPermit(
    address token,
    uint256 liquidity,
    uint256 amountTokenMin,
    uint256 amountETHMin,
    address to,
    uint256 deadline,
    bool approveMax,
    uint8 v,
    bytes32 r,
    bytes32 s
) external returns (uint256 amountToken, uint256 amountETH);

function swapExactTokensForTokens(
    uint256 amountIn,
    uint256 amountOutMin,
    address[] calldata path,
    address to,
    uint256 deadline
) external returns (uint256[] memory amounts);

function swapTokensForExactTokens(
    uint256 amountOut,
    uint256 amountInMax,
    address[] calldata path,
    address to,
    uint256 deadline
) external returns (uint256[] memory amounts);

function swapExactETHForTokens(uint256 amountOutMin, address[] calldata path, address to, uint256 deadline)
    external
    payable
    returns (uint256[] memory amounts);

function swapTokensForExactETH(
    uint256 amountOut,
    uint256 amountInMax,
    address[] calldata path,
    address to,
    uint256 deadline
) external returns (uint256[] memory amounts);

function swapExactTokensForETH(
    uint256 amountIn,
    uint256 amountOutMin,
    address[] calldata path,
    address to,
    uint256 deadline
) external returns (uint256[] memory amounts);

function swapETHForExactTokens(uint256 amountOut, address[] calldata path, address to, uint256 deadline)
    external
    payable
    returns (uint256[] memory amounts);

function quote(uint256 amountA, uint256 reserveA, uint256 reserveB) external pure returns (uint256 amountB);

function getAmountOut(uint256 amountIn, uint256 reserveIn, uint256 reserveOut)
    external
    pure
    returns (uint256 amountOut);

function getAmountIn(uint256 amountOut, uint256 reserveIn, uint256 reserveOut)
    external
    pure
    returns (uint256 amountIn);

function getAmountsOut(uint256 amountIn, address[] calldata path) external view returns (uint256[] memory amounts);

function getAmountsIn(uint256 amountOut, address[] calldata path) external view returns (uint256[] memory amounts);