text: const _SingleBar = require('./lib/single-bar')
  const _MultiBar = require('./lib/multi-bar')
  const _Presets = require('./presets/index')
  
  // sub-module access
  module.exports = {
    Bar: _SingleBar,
    SingleBar: _SingleBar,
    MultiBar: _MultiBar,
    Presets: _Presets
  }
  