Hardhat reorg

reorg.js

import {getUnnamedAccounts, ethers} from 'hardhat';

async function main() {
  await network.provider.send('evm_setAutomine', [false]);
  let snapshot = null;
  async function mine() {
    let blockNumber = parseInt(await network.provider.send('eth_blockNumber'), 16);
    let block = await network.provider.send('eth_getBlockByNumber', [`0x${blockNumber.toString(16)}`, false]);

    console.log(`${blockNumber}: ${block?.hash}`);

    if (blockNumber % 10 == 3) {
      if (!snapshot) {
        console.log('Taking snapshot at block', blockNumber);
        snapshot = await network.provider.send('evm_snapshot', []);
        await network.provider.send('evm_mine');
      } else {
        console.log('Creating new path');
        snapshot = null;
        await network.provider.send('evm_mine');
      }
    } else if (blockNumber % 10 == 5 && snapshot) {
      console.log('Reverting to last snapshot');
      if (!(await network.provider.send('evm_revert', [snapshot]))) {
        throw new Error('Could not revert');
      }
    } else {
      await network.provider.send('evm_mine');
    }

    setTimeout(mine, 1000);
  }

  mine();
}

// We recommend this pattern to be able to use async/await everywhere
// and properly handle errors.
main().catch((error) => {
  console.error(error);
  process.exitCode = 1;
});