tornado-core/migrations/2_deploy_mimc.js

const path = require('path');

const mimcGenContract = require('circomlib/src/mimcsponge_gencontract.js');
const Artifactor = require('truffle-artifactor');

const SEED = 'mimcsponge';


module.exports = function(deployer) {
  return deployer.then( async () =>  {
    const contractsDir = path.join(__dirname, '..', 'build/contracts');
    let artifactor = new Artifactor(contractsDir);
    let mimcContractName = 'MiMC';
    await artifactor.save({
      contractName: mimcContractName,
      abi: mimcGenContract.abi,
      unlinked_binary: mimcGenContract.createCode(SEED, 220),
    })
    .then(async () => {
      const MiMC = artifacts.require(mimcContractName);
      await deployer.deploy(MiMC);
    });
  });
};