javascript 如何监视默认导出的函数
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How to spy on a default exported function
提问by reza
sinon.spy takes 2 parameters, object and function name.
sinon.spy 有两个参数，对象和函数名。
I have a module as listed below:
我有一个如下所列的模块：
module.exports = function xyz() { }
module.exports = function xyz() { }
How do I define a spy for xyz? I don't have object name to use.
我如何定义间谍xyz？我没有要使用的对象名称。
Thoughts?
想法？
回答by Benjamin Hughes
The above actually doesn't work if you're using the ES6 modules import functionality, If you are I've discovered you can actually spy on the defaults like so.
如果您使用 ES6 模块导入功能，上述实际上不起作用，如果您是，我发现您实际上可以像这样监视默认值。
// your file
export default function () {console.log('something here');}
// your test
import * as someFunction from './someFunction';
spyOn(someFunction, 'default')
As stated in http://2ality.com/2014/09/es6-modules-final.html
如http://2ality.com/2014/09/es6-modules-final.html 所述
The default export is actually just a named export with the special name default
默认导出实际上只是一个带有特殊名称 default 的命名导出
So the import * as someFunction gives you access to the whole module.exports object allowing you to spy on the default.
因此 import * as someFunction 使您可以访问整个 module.exports 对象，从而允许您监视默认值。
