code: function inject (taskKey) {
      var taskName = task[taskKey]
  
      try {
        var e = eval(taskName) // eslint-disable-line
  
        if (typeof e === 'function') {
          funcs[taskName] = e
        } else {
          funcs[taskName] = function () { return e }
        }
      } catch (err) {
        var msg = 'Task not compiled: ' + taskName + ' [' + taskKey + ']' + err
        throw new Error(msg)
      }
    }
docs: Evaluate a single task and inject it.
  
  @param {String} taskKey