look into AmCharts v4

[tomwayson]

https://www.amcharts.com/docs/v4/getting-started/migrating-from-v3/

[tomwayson]

according to @benstoltz v4 charts are accessible by default

[benstoltz]

@tomwayson So I looked into this quite thoroughly. My tldr (in the auspices of accessibility are:)

The timeline for V3 is looking like this:
Updates: End of 2019.
Support: End of 2020.

So not immediately zomg, but we should be working towards this.
Considerations:

• We want to keep our spec the same
• overrides will break (probably)
• from the perspective of the hub, not load both amcharts 3 and 4 at the same time, BUT it is a possibility.

overall things to keep in mind in terms of internals we'd have to change:

• Serial and XY have merged into XYCHART which now supports any number of axes, and of any types or combinations.
• Graphs have become series. This may make things easier for us.
• pie charts might be easier to work with. You can even have nested pie charts like https://codepen.io/team/amcharts/pen/PQrvJr
• anything can be animated
• properties become 'states'. IE instead of a hover property you have a hover state which can override any and all props for the elme
• data has changed a bit to support real time data / effectively data can be added incrementally
• V3 === script files / global variables. V4 === modules that can be imported.