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I was trying to implement a method for signing an eip-1559 transaction using @ethereumjs/tx package. While following the steps mentioned in their documentation , I am encountering an error when trying to initialize the class Common of the @ethereumjs/common package.

Method :

const { FeeMarketEIP1559Transaction } = require('@ethereumjs/tx');
const Common = require('@ethereumjs/common');
const { Chain, Hardfork } = require('@ethereumjs/common');

async function signTx(to, from, value, gasLimit, nonce) {
    const privateKey = 'private_key'

    const rawTx = { to, from, value, gasLimit, data: '0x00', nonce }

    const pkey = Buffer.from(privateKey, 'hex'); 

    const common =  new Common({ chain: Chain.Ropsten, hardfork: Hardfork.London });

    const tx = FeeMarketEIP1559Transaction.fromTxData(rawTx, { common })

    tx.sign(pkey);

    const signedTx = `0x${tx.serialize().toString('hex')}`;

    return signedTx;
}

Error : UnhandledPromiseRejectionWarning: TypeError: Common is not a constructor

Package versions :

  • @ethereumjs/common : 2.4.0
  • @ethereumjs/tx: 3.3.0

Any help on this would be highly appreciated..

2 Answers 2

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This issue has been resolved.

@ethereumjs/common should be imported as default like below.

const Common = require('@ethereumjs/common').default;

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  • This is for CommonJs, how to use the lib in ES?
    – Gutyn
    Commented Oct 11, 2021 at 22:13
  • @Gutyn Can you please elaborate ? Commented Oct 27, 2021 at 20:07
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If you are using import statement a workaround looks like this :

import {default as common} from '@ethereumjs/common';
const Common = common.default

const c = new Common({ chain: Chain.Mainnet, hardfork: Hardfork.London })

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