code: function inject (taskKey) {
      var taskName = task[taskKey]
  
      // Do not overwrite a function if already defined.
      // For example, console.log cannot be used as is, it must binded to console.
      if (typeof funcs[taskName] === 'function') return
  
      // Skip also reserved keywords.
      if (reservedKeys.indexOf(taskName) > -1) return
  
      var globalValue = walkGlobal(taskName)
  
      if (no(globalValue)) return
  
      if (typeof globalValue === 'function') {
        funcs[taskName] = globalValue
      } else {
        funcs[taskName] = function () {
          return globalValue
        }
      }
    }
docs: Inject task