addLiquidity.js

function addLiquidity() public payable returns(uint[3] memory) {
    require(msg.value == ETHAmount);
    require(Dai.transferFrom(msg.sender, address(this), DaiAmount));
    // Do remember to approve
    Dai.approve(address(uniswapV2Router01), DaiAmount);
    (addLiquidityResult[0], addLiquidityResult[1], addLiquidityResult[2]) = uniswapV2Router01.addLiquidityETH{value: ETHAmount}(
            DaiAddress, DaiAmount, 0, 0, msg.sender, now + 120);
    return addLiquidityResult;
}