check for window object

[felixzapata]

It checks the window object to avoid an undefined error when you use from a Node application.

[dylanb]

Felix, can you explain the scenario under which you would use the library without a window object?

[felixzapata]

I am trying to make a gulp plugin to use the axel core in a project instead of with the tests. This way you can check the rules meanwhile you are developing some templates.

If I use your library inside of my plugin (work in progress) when I launch my tests i have errors because the window object is not defined.

My gulp plugin should read the source files from a source and pass to your library.

Regards.

[dylanb]

The way the rules engine works is it evaluates the HTML code using the DOM APIs. None of the rules will work if there is no DOM. If there is a DOM, it must have CSS enabled for certain of the rules to work, I think what you are trying to do is not within the scope of what this library was designed to do.

[felixzapata]

I try to load the source file and parse it as a DOM to pass to your function. This way I think is more easy to use during the development instead to configure the test.

[dylanb]

@felixzapata Instead of making this change, users who are doing what you are doing should add the following to their code base prior to calling the axe-core library

global.window = {};
global.window.addEventListener = function () {};

Then add the following to the end of the axe.js or the axe.min.js file

if (typeof module !== 'undefined') {
    module.exports = this.axe;
}

Now you can require it as follows:

var axe = require('./node_modules/axe-core/axe.js');

Note: the code was not intended to be run outside a browser, so we cannot guarantee the accuracy of the results if used this way.

[felixzapata]

Well, thanks.. I will try to make some attempt.