respond-framework/dist/createModule/hydrateModules.js

create as fast you think

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;
exports.mergePrevState = mergePrevState;
var _getSessionState = require("./helpers/getSessionState.js");
var _reduce = require("./plugins/reduce.js");
var _reserved = require("./reserved.js");
const hydrateModules = (state, system) => {
  const {
    replayState,
    baseState
  } = system;
  const {
    status
  } = replayState;
  switch (status) {
    case 'replay':
    case 'reload':
      {
        hydrate(state, baseState); // baseState is standard server hydration if available + replayTools
        (0, _reduce.default)(state, state.events.init());
      }
    case 'hmr':
      {
        hydrate(state, baseState); // baseState is HMR prevState + replayTools, as last event will be replayed on top of it
        break;
      }
    case 'session':
      {
        const [curr, prev] = (0, _getSessionState.getSessionState)(state.respond); // we couldn't getSessionState at the beginning in getSystemState, as we must wait until all models/events are created for reviver to function correctly here
        hydrate(state, curr);
        mergePrevState(state, prev);
        break;
      }
  }
};
var _default = exports.default = hydrateModules;
const hydrate = (state, baseState = {}) => {
  state.moduleKeys.forEach(k => {
    // depth-first
    if (!baseState[k]) return;
    hydrate(state[k], baseState[k]);
    delete baseState[k]; // delete to prevent overwriting child modules..
  });
  Object.assign(state, baseState); // ...so parent receives shallow merge of everything except already assign child modules
};
function mergePrevState(state, prev = {}, parent = {}) {
  state.moduleKeys.forEach(k => mergePrevState(state[k], prev[k], prev));
  const proto = Object.getPrototypeOf(state);
  proto.prevState = Object.assign(Object.create(proto), prev, {
    [_reserved._parent]: parent
  }); // need to create new object because snapshot has Object.preventExtensions
}