metamask-extension/app/scripts/migrations/027.js

// next version number
/*

normalizes txParams on unconfirmed txs

*/
import { cloneDeep } from 'lodash'

const version = 27

export default {
  version,

  async migrate (originalVersionedData) {
    const versionedData = cloneDeep(originalVersionedData)
    versionedData.meta.version = version
    const state = versionedData.data
    const newState = transformState(state)
    versionedData.data = newState
    return versionedData
  },
}

function transformState (state) {
  const newState = state

  if (newState.TransactionController) {
    if (newState.TransactionController.transactions) {
      const { transactions } = newState.TransactionController
      newState.TransactionController.transactions = transactions.filter((txMeta) => txMeta.status !== 'rejected')
    }
  }

  return newState
}