@gospime/autoloader/src/index.js

Utility of target modules autoloading

const Path = require('path');
const rdir = require('require-dir');

module.exports = (path, handler) => {
  if (typeof handler !== 'function') {
    throw new TypeError('Invalid handler');
  }

  const basename = Path.basename(path);
  if (!basename) throw new Error(`Invalid basename: '${basename}'`);
  //console.log(basename);

  // take only first level folder or the file `index.js`
  const pattern = `${basename}\\/[-\.\\w]+(\\/index\\.js|$)`;
  //console.log(pattern);

  const regex = new RegExp(pattern, 'i');

  const options = {
    recurse: true,
    filter: function (path) {
      //console.log(path, pattern, regex.test(path));
      return regex.test(path); // file ignoring
    }
  };

  const set = rdir(path, options);
  //console.log(set);

  const wrapper = ([key, item]) => {
    if (
      item &&
      typeof item === 'object' &&
      Object.prototype.hasOwnProperty.call(item, 'index')
    ) {
      let fn;
      const _module = item.index;
      if (typeof _module === 'function') {
        fn = _module;
      } else if (
        _module &&
        typeof _module === 'object' &&
        Object.prototype.hasOwnProperty.call(_module, 'default')
      ) {
        fn = _module.default;
      }

      //console.log(key, fn);
      if (fn) handler(fn);
    }
  };

  Object.entries(set).forEach(wrapper);
};