Ethers + accessList estimation

sendTx.js

async function sendTx(contract, method, params = []) {
  console.log(`Sending tx for contracts "${contract.address}" with method name "${method}" and params: "${params}"`);
  const gasEstimation = await contract.estimateGas[method](...params);
  const unsignedTx = await contract.populateTransaction[method](...params);

  const payload = {};

  const { accessList, gasUsed: gasUsedHex } = await ethers.provider.send("eth_createAccessList", [unsignedTx]);
  const gasUsed = ethers.BigNumber.from(gasUsedHex);
  if (gasUsed >= gasEstimation) {
    payload.gasLimit = gasEstimation;
    console.log(`Using accessList failed to estimate, skipping it (gasLimit: "${payload.gasLimit}")`);
  } else {
    payload.gasLimit = gasUsed;
    payload.accessList = accessList;
    console.log(`Using accessList as it give gas save (saved: "${gasEstimation.sub(payload.gasLimit).toString()}", gasLimit: "${payload.gasLimit}")`);
  }
  const receipt = await contract[method](...params, payload).then(tx => tx.wait());
  console.log(`Transaction "${receipt.transactionHash}" completed (gas used: ${receipt.gasUsed})`);
  return receipt;
}