metamask-extension/app/scripts/migrations/051.js

import { cloneDeep } from 'lodash'
import { NETWORK_TYPE_TO_ID_MAP } from '../controllers/network/enums'

const version = 51

/**
 * Set the chainId in the Network Controller provider data for all infura networks
 */
export default {
  version,
  async migrate(originalVersionedData) {
    const versionedData = cloneDeep(originalVersionedData)
    versionedData.meta.version = version
    const state = versionedData.data
    versionedData.data = transformState(state)
    return versionedData
  },
}

function transformState(state) {
  const { chainId, type } = state?.NetworkController?.provider || {}
  const enumChainId = NETWORK_TYPE_TO_ID_MAP[type]?.chainId

  if (enumChainId && chainId !== enumChainId) {
    state.NetworkController.provider.chainId = enumChainId
  }
  return state
}