Node.js v6.2.0类的扩展不是一个函数的错误？ [英] Node.js v6.2.0 class extends is not a function error?

问题描述

所以我试图在节点js中扩展一个类，并且编译器继续返回以下错误：

So I'm trying to extend a class in node js and the compiler keeps returning the following error:

TypeError: Class extends value #<Object> is not a function or null

我检查了我是正确导出类，我是，任何想法？我会在下面发布我的代码：

I checked that I was exporting the class correctly and I am, any ideas? I'll post my code below:

var VenueViews = require('../views/venue'); // If I remove this the error will dissapear (as expected)
class Venue {
  constructor(data) {
    this.setDataHere = data;
  }

  main () {
   var View = new VenueViews(); // This doesn't run
  }


}

module.exports = Venue;

/views/venue.js：

/views/venue.js:

var Venue = require('../handlers/venue');
console.log  (Venue) // This returns {} ???

class VenueViews extends Venue {
  constructor() {
    super();
  }
}

module.exports = VenueViews;

我知道节点支持这些 es6功能 ，所以我不确定为什么他们不工作？

I know that node supports these es6 features, so I'm unsure why they aren't working?

我不确定如果这是假设发生，但是当我记录我的场馆需要它返回一个空对象 {} 。 p>

I'm not sure if this is suppose to happen but, when I log my Venue require it returns an empty object {}.

console.log  (Venue) // This returns {} ???

推荐答案

原来我在我的代码，其中我是将扩展的类导入到本身正在扩展的类中（扭曲者：P）。

So it turns out I had a circular reference in my code, where I was importing the class that was extending, into the class that itself was extending (tongue twister :P).

明显的修复是简单地删除 extends 引用，找到另一种做我想要实现的方式。在我的情况下，它将 Venue 类属性传递到 VenueViews 构造函数。

The obvious fix was to simply remove the extends reference and find another way of doing what I was trying to achieve. In my case it was passing the Venue class properties down into the VenueViews constructor.

例如 var x = VenueViews（this）

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