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metamask-extension/app/scripts/migrations/009.js

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/*
This migration breaks out the CurrencyController substate
*/
import { cloneDeep, merge } from 'lodash'
const version = 9
export default {
version,
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migrate(originalVersionedData) {
const versionedData = cloneDeep(originalVersionedData)
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)
},
}
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function transformState(state) {
const newState = merge({}, state, {
CurrencyController: {
currentCurrency: state.currentFiat || state.fiatCurrency || 'USD',
conversionRate: state.conversionRate,
conversionDate: state.conversionDate,
},
})
delete newState.currentFiat
delete newState.fiatCurrency
delete newState.conversionRate
delete newState.conversionDate
return newState
}