Escaping htmlwidgets purgatory -- general debugging guides?

The htmlwidgets package is basically magic. There exists, however, a purgatory-like state where nothing is rendered and there are no error messages. I had a functioning widget hours ago, but what I thought amounted to some minor changes has derailed the entire project. Is there a guide to debugging htmlwidgets? I'm aware of Dean Attali's and John Coene's guides, but are there resources on debugging?

My issue was resolved by Winston's comments here.

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