main.js

chrome.runtime.onMessage.addListener(function (request, sender, sendResponse) {
  if (request.action == "saveClassData") {
    chrome.storage.local.set(
      {
        classData: request.classData,
      },
      function () {
        sendResponse({ status: "success: ", data: request.data });
      }
    );
  } else if (request.action == "getClassData") {
    chrome.storage.local.get(["classData"], function (result) {
      if (result.classData == undefined) {
        result.classData = {};
      }
      sendResponse(result);
    });
  } else if (request.action == "saveFolderData") {
    chrome.storage.local.set(
      {
        folderData: request.folderData,
      },
      function () {
        sendResponse({ status: "success: ", data: request.data });
      }
    );
  } else if (request.action == "getFolderData") {
    chrome.storage.local.get(["folderData"], function (result) {
      if (result.folderData == undefined) {
        result.folderData = { folders: {}, folderActiveClasses: {} };
      }

      sendResponse(result);
    });
  } else if (request.action == "getLastSelectedFolder") {
    chrome.storage.local.get(["lastSelectedFolder"], function (result) {
      if (result.lastSelectedFolder == undefined) {
        result.lastSelectedFolder = "__All Classes__";
      }

      sendResponse(result);
    });
  } else if (request.action == "setLastSelectedFolder") {
    chrome.storage.local.set(
      { lastSelectedFolder: request.data.lastSelectedFolder },
      function () {
        sendResponse({ status: "success" });
      }
    );
  } else if (request.action == "console_log") {
    console.log(request.data);
  }

  return true;
});