openzeppelin-contracts/test/helpers/create2.js

function computeCreate2Address(saltHex, bytecode, deployer) {
  return web3.utils.toChecksumAddress(
    `0x${web3.utils
      .sha3(`0x${['ff', deployer, saltHex, web3.utils.soliditySha3(bytecode)].map(x => x.replace(/0x/, '')).join('')}`)
      .slice(-40)}`,
  );
}

module.exports = {
  computeCreate2Address,
};