Remove index and datasetIndex from Element #6687
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Only review the last commit. The other commits are from #6576, which this depends on. I will rebase it after that PR is committed.
From a developer's point of view, the new APIs are purely more powerful since the interaction methods now return the
datasetIndex
andindex
as well. Previously these were private variables insideElement
Right now
Element
holds a few things that it doesn't really need to. This has a memory impact since anElement
is created for every data point and held throughout the life of the chart. Chart.js has relatively high memory requirements compared to some other libraries and I think we can improve our standing on this front.This alone probably doesn't have that large of an impact on performance, but there are additional performance improvements this will unblock that should be very impactful especially in the case that animations are disabled.