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metamask-extension/app/scripts/migrations/006.js

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/*
This migration moves KeyringController.selectedAddress to PreferencesController.selectedAddress
*/
import { cloneDeep } from 'lodash';
const version = 6;
export default {
version,
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migrate(originalVersionedData) {
const versionedData = cloneDeep(originalVersionedData);
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);
},
};
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function migrateState(state) {
const keyringSubstate = state.KeyringController;
// add new state
const newState = {
...state,
PreferencesController: {
selectedAddress: keyringSubstate.selectedAccount,
},
};
// rm old state
delete newState.KeyringController.selectedAccount;
return newState;
}