code: function (fn) {
      let args = Array.prototype.slice.call(arguments, 0)
      let debugFn = args[ 0 ]
      if (
        global.DEBUG && typeof global.DEBUG === 'string' &&
        (
          global.DEBUG === '*' ||
          global.DEBUG.split('|').map(a => a.toLowerCase()).indexOf(debugFn.toLowerCase()) !== -1
        )
      ) {
        console.log.apply(console, args)
      }
    }
docs: Utils