metamask-extension/app/scripts/first-time-state.js

/**
 * @typedef {Object} FirstTimeState
 * @property {Object} config Initial configuration parameters
 * @property {Object} NetworkController Network controller state
 */

/**
 * @type {FirstTimeState}
 */
const initialState = {
  config: {},
  PreferencesController: {
    frequentRpcListDetail: [],
  },
};

export default initialState;