waitForTransaction.js

  const sleep = (milliseconds) => { return new Promise(resolve => setTimeout(resolve, milliseconds)) }

  const waitUntilTransactionIsConfirmed = hash => new Promise(async (succ, err) => {
    while(true) {
      const transaction = await web3.eth.getTransactionReceipt(hash)
      if (transaction) {
        console.log('transaction status: ', transaction);
        return (transaction.status ? succ : err)(transaction)
      }
      await sleep(1000) // 1 second
    }
  })