amountout.js

const {
    Instance,
    TokenDecimals } = require('./contract')
const Decode = require('./decode')
const { config } = require('./getConfig')

const getAmountOut = async (tokenIn, tokenOut, amount) => {
    const ContractQuickSwap = (await Instance(
        Types.ROUTER,
        config.routerAddress, config)).methods

    const tokenInDecimals = await TokenDecimals(tokenIn)
    const tokenOutDecimals = await TokenDecimals(tokenOut)
    const amountIn = Decode.ToWei(amount, tokenInDecimals)

    const amounts = await ContractQuickSwap.getAmountsOut(amountIn, [tokenIn, tokenOut]).call()
    var amountOutMin = Decode.FromWei(amounts[amounts.length - 1], tokenOutDecimals)
    const expectedAmount = amountOutMin
    amountOutMin -= ((amountOutMin * (config.slippage / 100)))

    return {
        amountOutMin,
        expectedAmount
    }
}