docs: function BrowserifySingleFile (filename, opts) {
    if (!(this instanceof BrowserifySingleFile))
      return new BrowserifySingleFile(filename, opts);
  
    events.EventEmitter.call(this);
  
    this.filename = filename;
    this._source = fs.createReadStream(filename);
    this._next = this._source;
  
    // emulate browserify's API a little bit
    this._extensions = Object.keys(require.extensions);
    this._entries = [ filename ];
  }