const version = 9 /* This migration breaks out the CurrencyController substate */ const merge = require('deep-extend') module.exports = { version, migrate: function (versionedData) { versionedData.meta.version = version try { const state = versionedData.data const newState = transformState(state) versionedData.data = newState } catch (err) { console.warn(`MetaMask Migration #${version}` + err.stack) } return Promise.resolve(versionedData) }, } function transformState (state) { const newState = merge({}, state, { CurrencyController: { currentCurrency: state.currentFiat || 'USD', conversionRate: state.conversionRate, conversionDate: state.conversionDate, }, }) delete newState.currentFiat delete newState.conversionRate delete newState.conversionDate return newState }