openzeppelin-contracts/test/helpers/enums.js

function Enum(...options) {
  return Object.fromEntries(options.map((key, i) => [key, web3.utils.toBN(i)]));
}

module.exports = {
  Enum,
  ProposalState: Enum('Pending', 'Active', 'Canceled', 'Defeated', 'Succeeded', 'Queued', 'Expired', 'Executed'),
  VoteType: Enum('Against', 'For', 'Abstain'),
  Rounding: Enum('Down', 'Up', 'Zero'),
  OperationState: Enum('Unset', 'Pending', 'Ready', 'Done'),
};