Upgrade viz.js v2.0.0

[fmannhardt]

Viz.js has been recently released as v2.0.0:
https://github.com/mdaines/viz.js/releases/tag/v2.0.0
There are some breaking changes, for example, Viz is now a class instead of a function. This leads to issues when using two htmlwidgets that use different versions of viz.js (in this case my fmannhardt/processanimateR package on the same page resulting in the JS error:

TypeError: Cannot call a class as a function

Not sure how to solve this in general, but one solution would be to update of DiagrammeR to 2.0.0 also. Might also lead to other improvements.

[SKuehnel]

I have exactly the problem described by fmannhardt when rendering a graph in a shiny app. On the user interface side I use grVizOutput, server side renderGrViz and the render_graph function to render a dgr_graph object. While rendering in the R-Viewer works with render_graph, the Shiny App displays the error "TypeError: Cannot call a class as a function". I already tried a lot and unfortunately can't find a solution.

Do you have any hints or a workaround for the problem? I would be very grateful.

Greetings, Stephan.