sample.ts

import 'dotenv/config'
import { chromium } from 'playwright'
import fs from 'fs'
import { Keypair } from '@solana/web3.js'
import bs58 from 'bs58'

async function run() {
  const payer = Keypair.fromSecretKey(
    bs58.decode(process.env.PRIVATE_KEY_BASE58!)
  )
  const browser = await chromium.launch({ headless: true })
  const page = await browser.newPage()

  // Load local JS file
  let script = fs.readFileSync('./dist/bundle.js', 'utf8')
  script += `;(async () => {
  const payer = Keypair.fromSecretKey(
    bs58.decode("${process.env.PRIVATE_KEY_BASE58!}")
  );  
  const wallet = PhantomWalletMock.create('https://kora-8cwrc2-fast-mainnet.helius-rpc.com', payer, 'confirmed');
  await wallet.connect();
  localStorage.setItem("userID", payer.publicKey.toBase58());
  localStorage.setItem("wallet-immersive-mode", "false");
  localStorage.setItem("walletName", '"Phantom"');
  window.solana = wallet;  
})()`

  await page.goto(
    'https://jup.ag/limit?sell=EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v&buy=So11111111111111111111111111111111111111112'
  )

  await page.waitForLoadState('load')

  // Inject before any page scripts
  await page.evaluate(script)

  const response = await page.waitForResponse(
    'https://trigger.jup.ag/privy/wallets/' + payer.publicKey.toBase58()
  )
  const json = await response.json()
  console.log(json)

  browser.close()
}

run()