How to use the web-ext-native-msg.getFileTimestamp function in web-ext-native-msg

const exportEditorConfig = async (data, editorConfigPath) => {
  if (!isString(data)) {
    throw new TypeError(`Expected String but got ${getType(data)}.`);
  }
  let func;
  data = data && JSON.parse(data);
  if (isObjectNotEmpty(data)) {
    const {editorPath} = data;
    const editorName = await getFileNameFromFilePath(editorPath);
    const executable = isExecutable(editorPath);
    const timestamp = await getFileTimestamp(editorConfigPath);
    const reg =
      new RegExp(`\\$(?:${TMP_FILE_PLACEHOLDER}|{${TMP_FILE_PLACEHOLDER}})`);
    const keys = Object.keys(editorConfig);
    for (const key of keys) {
      const value = data[key];
      if (key === "editorPath") {
        editorConfig[key] = value;
      }
      if (key === "cmdArgs") {
        editorConfig[key] = new CmdArgs(value).toArray();
        editorConfig.hasPlaceholder = reg.test(value);
      }
    }
    const msg = {
      [EDITOR_CONFIG_RES]: {
        editorName, executable,

const getTmpFileFromFileData = async (fileData = {}) => {
  const {dataId, dir, host, tabId, windowId} = fileData;
  const func = [];
  let msg;
  if (dataId && dir && host && tabId && windowId && fileMap[dir]) {
    const fileId = [windowId, tabId, host, dataId].join("_");
    if (fileMap[dir].has(fileId)) {
      const {filePath} = fileMap[dir].get(fileId);
      if (isFile(filePath)) {
        const value = await readFile(filePath, {encoding: CHAR, flag: "r"});
        const timestamp = await getFileTimestamp(filePath);
        const data = fileData;
        data.timestamp = timestamp;
        msg = {
          [TMP_FILE_RES]: {data, value},
        };
        func.push(writeStdout(msg));
      } else {
        fileMap[dir].delete(fileId);
      }
    }
  }
  if (!msg) {
    const data = fileData;
    data.timestamp = FILE_NOT_FOUND_TIMESTAMP;
    msg = {
      [TMP_FILE_DATA_REMOVE]: {data},

const createTmpFileResMsg = async key => {
  let func;
  if (isString(key) && isFile(key)) {
    const fileId = await getFileIdFromFilePath(key);
    if (fileId) {
      const obj = fileMap[TMP_FILES].get(fileId);
      if (obj) {
        const {data} = obj;
        if (data) {
          const value =
            await readFile(key, {encoding: CHAR, flag: "r"}) || "";
          data.timestamp = await getFileTimestamp(key);
          func = writeStdout({
            [TMP_FILE_RES]: {
              data, value,
            },
          });
        }
      }
    }
  }
  return func || null;
};