typescript source code of reducer

import { Reducer } from "redux";
import { produce } from "immer";
import { ipcRenderer } from "electron";

import { WgConfigTypes, WgConfigState } from "../../../types/store";

const INITIAL_STATE: WgConfigState = {
  files: [],
  activeTunnelName: "",
};

const wgConfig: Reducer<WgConfigState> = (state = INITIAL_STATE, action) => {
  return produce(state, (draft) => {
    switch (action.type) {
      case WgConfigTypes.fetchFiles: {
        const { files } = action.payload;
        draft.files = files;
        ipcRenderer.send("WgConfigStateChange", draft.files.map(file => ({
          name: file.name,
          path: file.path,
          active: file.active,
        })));
        break;
      }

      case WgConfigTypes.addFile: {
        const { file } = action.payload;
        draft.files.push(file);
        ipcRenderer.send("WgConfigStateChange", draft.files.map(file => ({
          name: file.name,
          path: file.path,
          active: file.active,
        })));
        break;
      }

      case WgConfigTypes.deleteFile: {
        const { filename } = action.payload;
        draft.files = draft.files.filter((file) => file.name !== filename);
        ipcRenderer.send("WgConfigStateChange", draft.files.map(file => ({
          name: file.name,
          path: file.path,
          active: file.active,
        })));
        break;
      }

      case WgConfigTypes.updateStatus: {
        const { activeTunnelName } = action.payload;

        draft.activeTunnelName = activeTunnelName;
        draft.files = draft.files.map((file) => {
          file.active = file.name === activeTunnelName;

          if (file.active) {
            file.lastConnectAt = new Date().toISOString();
            localStorage.setItem(file.name, file.lastConnectAt);
          }

          return file;
        });
        ipcRenderer.send("WgConfigStateChange", draft.files.map(file => ({
          name: file.name,
          path: file.path,
          active: file.active,
        })));
        break;
      }

      default: {
        break;
      }
    }
  });
};

export default wgConfig;