Highcharts module offline-exporting.js is not included

[WoozyG]

This isn't loaded as part of HighchartsScriptLoader, but should be, or at least should be an option. Until it is, how should I go about getting the proper version loaded, preferably in a way that doesn't break when the Highcharts version is bumped?

[johannesh2]

Thanks for the report. Adding to 4.1. In the meantime, maybe @alvarezguille can give you some way to load it.

[alvarezguille]

I did a small example of how to add one Highcharts extension some time ago, you can check it in
https://github.com/alvarezguille/charts-export-csv
Main steps are explained in readme
Regarding the version compatibility, I did a smoke test and the module for Highcharts 4.2.6 seems to work even with Highcharts latest version https://jsfiddle.net/alvarezg/vLjb5fa0/. Anyway once it's included in Vaadin Charts and released you should probably remove the resource loading from your project.
If you want to play safe you can check that the module is not there before loading, something similar to this snippet https://github.com/vaadin/charts/blob/master/addon/src/main/java/com/vaadin/addon/charts/client/HighchartsScriptLoader.java#L84-L89 but checking for Highcharts.CanVGRenderer