code: function parser (name) {
    var mod = parsers[name]
  
    if (mod !== undefined) {
      return mod.parse
    }
  
    // this uses a switch for static require analysis
    switch (name) {
      case 'qs':
        mod = require('qs')
        break
      case 'querystring':
        mod = require('querystring')
        break
    }
  
    // store to prevent invoking require()
    parsers[name] = mod
  
    return mod.parse
  }
docs: Get parser for module name dynamically.
  
  @param {string} name
  @return {function}
  @api private