// next version number const version = 0 /* description of migration and what it does */ import clone from 'clone' export default { version, migrate: async function (originalVersionedData) { const versionedData = clone(originalVersionedData) versionedData.meta.version = version const state = versionedData.data const newState = transformState(state) versionedData.data = newState return versionedData }, } function transformState (state) { const newState = state // transform state here return newState }