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

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

import { Area } from "../class/export";
import { SELECT_AREA, SET_FLOOR_STYLES } from "../constants";
export default function (state, action) {
  switch (action.type) {
    case SELECT_AREA:
      return Area.select(state, action.layerID, action.areaID).updatedState;
    case SET_FLOOR_STYLES:
      return Area.setFloorStyles(state, action.texture).updatedState;
    default:
      return state;
  }
}