v2 changes

Here’s what we’re going to do for v2, targeting a release in January or February 2020:

• switch to native-promise-only and officially drop support for IE9 and IE10
• stop exporting D3
• stop exporting Plotly.plot
• drop area, contourgl and pointcloud traces
• drop support for polar plots in scatter (aka “micropolar”?) i.e. scatter.r and scatter.t and layout.angularaxis and layout.radialaxis and anything else related (cc @alexcjohnson anything else I missed?)

For reference, the primary trigger for version 2.0 is the native-promise-only change, with which we fully drop support for IE 9/10, even though that support has been eroding severely over the last couple of years. This change is driven by a desire to remove function constructors from as many of our bundles as possible for security reasons, as tracked in #897. Since we’re doing a v2, we’re trying to shed as much deprecated stuff as we can without being otherwise too-disruptive.

[archmoj]

Just wondering if #5230 will make it in 2.0?

I think new features like that could possibly be added in a minor afterwards e.g. v2.x.0

[archmoj]

Ah ok so in your message above, it’s Plotly.Plots.purge that is going away, and that’s an alias to Plotly.purge?

No it is not an alias. Plotly.purge() performs other operations in addition to calling Plotly.Plots.purge() https://github.com/plotly/plotly.js/blob/59390cbabf7d48c19179f68daf13e7d8af32f329/src/plot_api/plot_api.js#L3598-L3620