const version = 6 /* This migration moves KeyringController.selectedAddress to PreferencesController.selectedAddress */ const extend = require('xtend') module.exports = { version, migrate: function (versionedData) { versionedData.meta.version = version try { const state = versionedData.data const newState = migrateState(state) versionedData.data = newState } catch (err) { console.warn(`MetaMask Migration #${version}` + err.stack) } return Promise.resolve(versionedData) }, } function migrateState (state) { const keyringSubstate = state.KeyringController // add new state const newState = extend(state, { PreferencesController: { selectedAddress: keyringSubstate.selectedAccount, }, }) // rm old state delete newState.KeyringController.selectedAccount return newState }