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The issue at hand is that the library does not provide any meaningful way to jump in with a module loader and properly first fully load the dependency ChartJS before carrying on with the execution.
It would be the best if the library could wrap its code in a UMD compatible format to satisfy the most common formats at once, amongst those RequireJS, which is used for the Aurelia CLI.
I see you’ve created a Github Issue, including the libraries author as well. Good work, I’ve created a small PR to add the missing feature, which then also makes the example work, without throwing the missing helper error.
Source:stackexchange.com