require.context polyfill

README.md

This script is based on this StackOverflow answer, with some modifications to fix its issues.

require-context-polyfill.js

// Original by Edmundo Santos at https://stackoverflow.com/a/42191018
// Modified by Doma (https://github.com/SevenOutman)

// This condition actually should detect if it's an Node environment
if (typeof require.context === 'undefined') {
  const fs = require('fs');
  const path = require('path');

  require.context = (base = '.', scanSubDirectories = false, regularExpression = /\.js$/) => {
    const context = path.resolve(__dirname, base);
    const files = {};

    function readDirectory(directory) {
      fs.readdirSync(directory).forEach((file) => {
        const fullPath = path.resolve(directory, file);

        if (fs.statSync(fullPath).isDirectory()) {
          if (scanSubDirectories) readDirectory(fullPath);

          return;
        }

        if (!regularExpression.test(fullPath)) return;

        files['./' + path.relative(context, fullPath)] = true;
      });
    }

    readDirectory(context);

    function Module(file) {
      return require(path.resolve(context, file));
    }

    Module.keys = () => Object.keys(files);

    return Module;
  };
}