Figma Components

It's good practice to make a plugin's UI consistent, to the degree that it is possible, with the rest of the Figma UI. This almost always leads to a better experience for users.

We don't have an official set of reusable components yet. However, here are two things that might help you:

Tom Lowry's Figma UI JS/CSS files

UI2, a snapshot of Figma's internal design system