lkt/swap2.mjs

import base, { ChainId } from "iziswap-sdk/lib/base/index.js";
import Web3 from "web3";
import { BigNumber } from "bignumber.js";
import quoter from "iziswap-sdk/lib/quoter/index.js";
import swap from "iziswap-sdk/lib/swap/index.js";
import token from "iziswap-sdk/lib/base/token/index.js";
import { Wallet, Provider } from "zksync-web3";

const rpc = "https://zksync2-testnet.zksync.dev/";
const privateKey = "0xd768b0b3f8dedcb465ad680268453391f7da6ec4e1942a13fdfcdea8773aab3e";
const quoterAddress = "0xE93D1d35a63f7C6b51ef46a27434375761a7Db28";
const swapAddress = "0x3040EE148D09e5B92956a64CDC78b49f48C0cDdc";
const fromTokenAddress = "0x0faF6df7054946141266420b43783387A78d82A9";
const swapAmount = 100;

const chain = base.initialChainTable[ChainId.ZkSyncAlphaTest];
console.log("rpc: ", rpc);
const web3 = new Web3(new Web3.providers.HttpProvider(rpc));
const account = web3.eth.accounts.privateKeyToAccount(privateKey);
console.log("address: ", account.address);

const fromToken = await token.fetchToken(fromTokenAddress, chain, web3);
console.log("fromToken: ", fromToken);
const toToken = base.getGasToken(base.ChainId.ZkSyncAlphaTest);
console.log("toToken: ", toToken);

const quoterContract = quoter.getQuoterContract(quoterAddress, web3);

const payAmount = new BigNumber(swapAmount).times(10 ** fromToken.decimal);
const fee = 2000; // 2000 means 0.2%
const params = {
    // pay testA to buy testB
    tokenChain: [fromToken, toToken],
    feeChain: [fee],
    inputAmount: payAmount.toFixed(0),
};

const { outputAmount } = await quoter.quoterSwapChainWithExactInput(quoterContract, params);

const receiveAmount = outputAmount;
const receiveAmountDecimal = token.amount2Decimal(new BigNumber(receiveAmount), toToken);

console.log(fromToken.symbol + " to pay: ", swapAmount);
console.log(toToken.symbol + " to acquire: ", receiveAmountDecimal);

const swapContract = swap.getSwapContract(swapAddress, web3);

const swapParams = {
    ...params,
    // slippery is 1.5%
    minOutputAmount: new BigNumber(receiveAmount).times(0.985).toFixed(0),
    strictERC20Token: false,
};

const { swapCalling, options } = swap.getSwapChainWithExactInputCall(swapContract, account.address, chain, swapParams);
const gasLimit = await swapCalling.estimateGas(options);
console.log("gas limit: ", gasLimit);
const provider = new Provider(rpc);
const wallet = new Wallet(privateKey).connect(provider);
const tx = await wallet.sendTransaction({
    value: Web3.utils.numberToHex(options.value),
    data: swapCalling.arguments[0][0],
    to: swapAddress,
    gasLimit,
});
console.log(JSON.stringify(tx, null, 4));