Jsdom: Implement DOM selection apis

[tolmasky]

https://developer.mozilla.org/en-US/docs/Web/API/Window.getSelection

Even a nonfunctioning shim would go a long way. Currently I just do the following:

window.document.getSelection = function() { return { addRange: function() {}, removeAllRanges:function() { } } };

Just to avoid "cannot call undefined" when running getSelection().

[domenic]

We're not really in the business of nonfunctioning shims, but you're welcome to add that to your own jsdom windows.

[avk]

Any ideas on how to bake this into how Jest uses jsdom?

[domenic]

Not sure myself; @Sebmaster is a bit more familiar with jest, but I think the Jest issue tracker will be your best bet.

[avk]

@domenic thanks, got the shim I needed by adding a version of @tolmasky's code in a Jest helper:

// spec/javascripts/helpers/jest-env.js
// window.getSelection isn't in jsdom
// https://github.com/tmpvar/jsdom/issues/937
window.getSelection = function() { 
  return { 
    addRange: function() {}, 
    removeAllRanges:function() {} 
  };
};

and linking to the above file via Jest's config.setupEnvScriptFile.