Closure Compiler警告“坏类型注释。未知类型...“当Ecmascript 6类扩展时

问题描述

我收到一个警告，每个Ecmascript 6类继承自另一个类当使用Closure Compiler编译时：

我已经尽可能多地仍然会收到警告：

  /src/main/js/com/tm/dev/Dog.js：警告 - 错误类型注释。未知类型模块$$ src $ main $ js $ com $ tm $ dev $ Animal.default 
  

编译代码运行正常。

Animal.js：

 导出默认类{
 constructor（）{
 this.legs = []; 
} 
 addLeg（legId）{
 this.legs.push（legId）; 
} 
} 
  

Dog.js：

  import Animal从'./Animal'; 
 
导出默认类extends Animal {
 constructor（）{
 super（）; 
 [1,2,3,4] .forEach（leg => this.addLeg（leg））; 
 console.log（'Legs：'+ this.legs.toString（））; 
} 
} 
  

解决方案

A提示是在警告消息中，但如果您不熟悉。

(The following is untested.)

Closure Compiler is reporting that in Dog.js it does not recognise the "type" Animal. This is because you are exporting an unnamed class expression: export default class.

So you could give your class a name (export default class Animal) and Closure Compiler may recognise the token Animal when it is consumed in Dog.js.

And you can also give your class a JSDoc that marks it as a @constructor:

/**
 * Animal.
 * @constructor
 */
export default class Animal {}

这篇关于Closure Compiler警告“坏类型注释。未知类型...“当Ecmascript 6类扩展时的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！