node/lib/internal/module.js

'use strict';

module.exports = { makeRequireFunction, stripBOM };

// Invoke with makeRequireFunction.call(module) where |module| is the
// Module object to use as the context for the require() function.
function makeRequireFunction() {
  const Module = this.constructor;
  const self = this;

  function require(path) {
    return self.require(path);
  }

  require.resolve = function(request) {
    return Module._resolveFilename(request, self);
  };

  require.main = process.mainModule;

  // Enable support to add extra extension types.
  require.extensions = Module._extensions;

  require.cache = Module._cache;

  return require;
}

/**
 * Remove byte order marker. This catches EF BB BF (the UTF-8 BOM)
 * because the buffer-to-string conversion in `fs.readFileSync()`
 * translates it to FEFF, the UTF-16 BOM.
 */
function stripBOM(content) {
  if (content.charCodeAt(0) === 0xFEFF) {
    content = content.slice(1);
  }
  return content;
}