Documentation on creating block widgets

Widget blocks are the same as standard post/page blocks, so if you follow the documentation about creating Gutenberg blocks, eg. https://developer.www.ads-software.com/block-editor/handbook/tutorials/create-block/, and then install a plugin containing a block created this way it should be available in both the post/page and widgets editors.

@glendaviesnz thanks, I’ll review. I only want to create widget though.. this particular item would have no use as a post/page block.

There is not any difference any more. Widget areas and sidebars simply display blocks now. That said, you could still create a traditional widget and insert it via the Legacy Widget block. This block was created for reverse compatibility. Blocks are the way to go going forward.