custom-chain-id-tx.ts

import { LegacyTransaction } from '../dist/cjs'
import { toBytes } from '@ethereumjs/util'
import { Common, Hardfork } from '@ethereumjs/common'

const txData = toBytes(
  '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'
)

const common = Common.custom({ chainId: 3 })
common.setHardfork(Hardfork.Petersburg)
const tx = LegacyTransaction.fromSerializedTx(txData, { common })

if (
  tx.isValid() &&
  tx.getSenderAddress().toString() === '0x9dfd2d2b2ed960923f7bf2e8883d73f213f3b24b'
) {
  console.log('Correctly created the tx')
} else {
  console.error('Invalid tx')
}