metamask-extension/app/scripts/controllers/transactions/enums.js

const TRANSACTION_TYPE_CANCEL = 'cancel'
const TRANSACTION_TYPE_RETRY = 'retry'
const TRANSACTION_TYPE_STANDARD = 'standard'

const TRANSACTION_STATUS_APPROVED = 'approved'
const TRANSACTION_STATUS_CONFIRMED = 'confirmed'

export {
  TRANSACTION_TYPE_CANCEL,
  TRANSACTION_TYPE_RETRY,
  TRANSACTION_TYPE_STANDARD,
  TRANSACTION_STATUS_APPROVED,
  TRANSACTION_STATUS_CONFIRMED,
}