Plugin not working #19

I'm not clear on how this plugin even works. I've installed it, run the postinstall (which by the way adds the asset folders back to my root directory when I've changed that in the settings config) and I add a sass file next to the button.mustache but then I get an error:

plugin-node-tab: There was an error parsing sibling JSON for 00-atoms/buttons/button.mustache
{ Error: ENOENT: no such file or directory, stat '/edition-node-gulp/src/_patterns/00-atoms/buttons/button.js'
    at Object.fs.statSync (fs.js:898:18)

Not only does it not show .js files in the settings docs, but it also shows as everything else as optional.

Also, I'm not even clear what this plugin is doing? Is it adding a tab above the top black navigation?