balancerv2.ts

const BigNumber = require('bignumber.js');
import { JsonRpcProvider } from '@ethersproject/providers';
import {
    SOR as SOR2,
    SwapTypes,
    DisabledOptions,
    SwapOptions,
    PoolFilter,
    fetchSubgraphPools
} from '@balancer-labs/sor2';

const provider = new JsonRpcProvider(
    `https://mainnet.infura.io/v3/${process.env.INFURA}`
);
const DAI = '0x6B175474E89094C44Da98b954EedeAC495271d0F';
const USDC = '0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48';
const amountIn = new BigNumber('1');
const tokenIn = USDC;
const tokenOut = DAI;
const gasPrice = new BigNumber('30000000000'); // You can set gas price to whatever the current price is.
const swapCost = new BigNumber('100000'); // A pool swap costs approx 100000 gas
// URL for pools data
const poolsUrl = `https://storageapi.fleek.co/balancer-bucket/balancer-exchange/pools`

async function swapExactIn() {
    const network = await provider.getNetwork()
    const chainId = network.chainId
    const maxPools = 100

    const disableOptions: DisabledOptions = {
        isOverRide: false,
        disabledTokens: []
    }
    const poolsSourceV2 = `https://storageapi.fleek.co/johngrantuk-team-bucket/poolsV2.json`
    const subgraphPoolsV2 = `https://api.thegraph.com/subgraphs/name/balancer-labs/balancer-v2`
    const sor2 = new SOR2(
        provider,
        gasPrice,
        maxPools,
        chainId,
        poolsSourceV2,
        swapCost,
        disableOptions
    )
    const subgraphPools = await fetchSubgraphPools(subgraphPoolsV2)
    console.log('Fetch pool result: ', await sor2.fetchPools(true, subgraphPools))
    const swapOptions: SwapOptions = {
        poolTypeFilter: PoolFilter.All,
        timestamp: Math.floor(Date.now() / 1000)
    }
    await sor2.setCostOutputToken(
        tokenOut,
        6,
        swapCost
      )
    const swapInfo2 = await sor2.getSwaps(
        tokenIn,
        tokenOut,
        SwapTypes.SwapExactIn,
        amountIn,
        swapOptions
    )

    console.log(swapInfo2)
}

swapExactIn();