The latest @foldkit Blocks + Effect Layers preview is ready. I’ll keep refining it as feedback comes in. What’s new: - Simpler root setup: compose your application from Blocks, then pass the root ApplicationBlock to Program.make. - Cleaner child OutMessage policies with better inference. - Better support for optional children with keyed identities. - Separate guides for migrating from stable and upgrading an earlier preview. Installation instructions and copyable migration prompts are in the PR description. github.com/foldkit/foldkit/p…

Goal is to get the preview release I’ve been teasing out tomorrow (Saturday). Posting for accountability :) The new APIs will be good. The docs (for the preview release) will be unreviewed slop. Better to get it out though! Quick overview: The architecture will stay the same. The way you compose the pieces (Model, Message, update, view, Commands, Subscriptions, etc.) will change. The new Block primitive replaces Submodel. Think of a Block as a mini Foldkit program. Parent Blocks bind child Blocks and define how they connect, like a socket and plug. This streamlines a lot of the boilerplate you see in larger Foldkit applications. Block provides more explicit structure for how your application fits together, which feels very “Foldkit” to me! Type inference is a lot better. Instead of repeatedly annotating Model and Message types, you define a Block in one place with its Model and Message Schemas, then use that to create the other pieces of the Block (update, view, etc.). It reads quite nicely! Sharing the counter example here to give you a sense of the new APIs. This doesn’t show off all the cool new Block stuff, but it does (I hope) show how things have been streamlined. There’s a lot more, but this message is already long and it’s nearly 2 AM, so I’ll leave it there for now. Thanks!