listandswap.js

// Use ethers JS libray
// Required ERC20 Abi
// Required Uniswap/Pancakeswap Router Abi
// Required Provider wallet (who provide the liquidity)
// Required Buyer wallet (who want to buy TEST token)
// Read docs https://docs.uniswap.org/protocol/V2/reference/smart-contracts/router-02#addliquidityeth
// Read docs https://docs.uniswap.org/protocol/V2/reference/smart-contracts/router-02#swapexacttokensfortokens

console.log('addLiquidity TEST BUSD ...')
let amm = new ethers.Contract(config.get('AMMRouterAddress'), ammRouterAbi, provider)
await (await test.approve(config.get('AMMRouterAddress'), ethers.constants.MaxInt256, {nonce: nonce})).wait()
nonce += 1
await (await busd.approve(config.get('AMMRouterAddress'), ethers.constants.MaxInt256, {nonce: nonce})).wait()
nonce += 1
await (await amm.addLiquidity(
    test.address,
    busd.address,
    ethers.utils.parseUnits('1000', 18),
    ethers.utils.parseUnits('1000', 18),
    ethers.utils.parseUnits('995', 18),
    ethers.utils.parseUnits('995', 18),
    provider.address,
    Math.floor(new Date().getTime() / 1000) + 1000,
    {nonce : nonce}
)).wait()
nonce += 1
console.log('Buyer approve TEST ...')
let nonceBuyer = await buyer.getTransactionCount()
await (await test.connect(buyer).approve(config.get('AMMRouterAddress'), ethers.constants.MaxInt256, {nonce: nonceBuyer})).wait()
nonceBuyer += 1
console.log('swapExactTokensForTokens Buyer swap TEST BUSD ...')
await (await amm.connect(buyer).swapExactTokensForTokens(
    ethers.utils.parseUnits('10', 18),
    ethers.utils.parseUnits('0', 18),
    [ test.address, busd.address ],
    buyer.address,
    Math.floor(new Date().getTime() / 1000) + 1000,
    {nonce : nonceBuyer}
)).wait()
nonceBuyer += 1
nonce += 1