load files from directory and subdirectiry in nodejs

getFileName.js

module.exports = (filePath) => {
  const dirPathArr = filePath.split('/');
  const targerFile = dirPathArr[dirPathArr.length - 1];
  const dotIndex = targerFile.indexOf('.');
  return targerFile.slice(0, dotIndex > -1 ? dotIndex : targerFile.length);
}

index.js

// index where is requery module

module.exports = require('../utils/loadModules')(__dirname);

loadModules.js

// ../utils/loadModules.js

const fs = require('fs');
const path = require('path');

const getFileName = require('./getFileName');

const defaultFilter = ['index'];

function loadModule (modulePath, filter) {
  const files = fs.readdirSync(modulePath);
  const modules = {};
  if (filter === undefined) {
    filter = defaultFilter;
  }
  const ignoredFileNames = new Set(filter);
  files.forEach((file, fileIndex) => {
    const filePath = path.join(modulePath, file);
    const fileName = getFileName(filePath);
    if (fs.statSync(filePath).isDirectory()) {
      modules[fileName] = loadModule({ modulePath: filePath });
    } else {
      if (!ignoredFileNames.has(fileName)) {
        modules[fileName] = require(path.join(modulePath, fileName));
      }
    }
  });
  return modules;
};

module.exports = loadModule;