How do I add Handlebar helpers?

[sebastiangraz]

Hi, thanks for this boilerplate. I found great use for it.
This isn't necessarily a bug, I'm just trying to figure out how I can add custom .hbs helpers such as this one (http://doginthehat.com.au/2012/02/comparison-block-helper-for-handlebars-templates/)

Do I create a new .js file within scripts and import it to main.js? Or do I need to fiddle with webpack.config?

Best Regards