sendSignedTransaction.ts

const sendSignedTransaction = async (
  privateKey: string,
  provider: string,
  tx: any,
  contractAddress: string) => {

  const web3 = new Web3(provider);
  const client = privateKeyToAddress(provider, privateKey);
  const networkId = await web3.eth.net.getId();
  const nonce = await web3.eth.getTransactionCount(client)
  const gas = (await tx.estimateGas({ from: client, nonce }));
  const gasPrice = await web3.eth.getGasPrice();
  const data = tx.encodeABI()


  const signedTx = await web3.eth.accounts.signTransaction({
    to: contractAddress,
    data,
    gas,
    gasPrice,
    nonce,
    chainId: networkId
  }, privateKey)

  // @ts-ignore
  const receipt = await web3.eth.sendSignedTransaction(signedTx.rawTransaction);

  return receipt;
}


export default sendSignedTransaction;