We are almost done with the first pass drafting Parsoid's extension API ( Parsoid/Extension_API ). All the extensions that live in the Parsoid codebase now exclusively use this API and are disentangled from rest of Parsoid's internals. This work informs the draft Parsoid Extension API. Subbu presented at Enterprise MediaWiki Conference last week to get early feedback ( EMWCon_Spring_2020/Program has slides & video links). In a couple weeks, after some refinement and tweaking, will broadcast this more broadly. The goal is to get a more complete working version of this Parsoid Extension API in the next couple months and have extensions deployed on the Wikimedia cluster to be compatible with Parsoid.