kitchen-simulator/es/reducers/scene-reducer.js

It is a kitchen simulator (self-contained micro-frontend).

import { Layer } from "../class/export";
import { history } from "../utils/export";
import { ADD_LAYER, SELECT_LAYER, SET_LAYER_PROPERTIES, REMOVE_LAYER, UPDATE_MOVING_STATE } from "../constants";
export default function (state, action) {
  var saveHistory = function saveHistory() {
    return state = state.merge({
      sceneHistory: history.historyPush(state.sceneHistory, state.scene)
    });
  };
  switch (action.type) {
    case ADD_LAYER:
      saveHistory();
      return Layer.create(state, action.name, action.altitude).updatedState;
    case SELECT_LAYER:
      saveHistory();
      return Layer.select(state, action.layerID).updatedState;
    case SET_LAYER_PROPERTIES:
      saveHistory();
      return Layer.setProperties(state, action.layerID, action.properties).updatedState;
    case REMOVE_LAYER:
      saveHistory();
      return Layer.remove(state, action.layerID).updatedState;
    case UPDATE_MOVING_STATE:
      return Layer.updateMovingState(state, action.showflag).updatedState;
    default:
      return state;
  }
}