peritext
liveblocks
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peritext | liveblocks | |
---|---|---|
20 | 22 | |
615 | 3,042 | |
2.6% | 3.9% | |
0.0 | 9.6 | |
over 1 year ago | 2 days ago | |
TypeScript | TypeScript | |
MIT License | Apache License 2.0 |
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
peritext
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Cola: A text CRDT for real-time collaborative editing
This doesn’t appear to support rich text formatting ranges like bold, italic, etc - unless I’m missing something in the API. AFAIK Peritext is still the state of the art in rich text CRDT algorithms https://www.inkandswitch.com/peritext/
I’d love to see this build the rich text stuff from the Peritext algorithm.
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The Cloud Is a Prison. Can the Local-First Software Movement Set Us Free?
The work Ink & Switch (unaffiliated) do has been an inspiration to my with regard to local-first and decentralized software: https://www.inkandswitch.com
They have a quasi-manifesto on local-first (https://www.inkandswitch.com/local-first/) and have published the best rich text CRDT around, Peritext: https://www.inkandswitch.com/peritext/
Lots of interesting work happening in this space.
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Figma Is a File Editor
Take a look at https://automerge.org/ and the stack those folks are building. You're exactly right that it's a difficult balance (specifically the trick is proving commutativity for the domain-specific data of your application). But automerge (and then https://github.com/inkandswitch/peritext) show it's at least possible. Good stuff.
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Ask HN: What is new in Algorithms / Data Structures these days?
Yes - The BFT problem only matters when you have Byzantine actors. But I think users deserve and expect the system to be reasonably well behaved and predictable in all situations. Anything publically writable, for example, needs BFT resilience. Or any video game.
As for the prosemirror problem, I assume you’re talking about weird merges from users putting markdown in a text crdt? You’re totally right - this is a problem. Text CRDTs treat documents as a simple sequence of characters. And that confuses a lot of structured formats. For example, if two users concurrently bold the same word, the system should see that users agree that it should be bolded. But if that “bold” intent is translated into “insert double asterisks here and here”, you end up with 4 asterisks before and after the text, and that confused markdown parsers. The problem is that a text crdt doesn’t understand markdown.
JSON editing has similar problems. I’ve heard of plenty of people over the years putting json text into a text crdt, only to find that when concurrent edits happen, the json grows parse errors. Eg if two users concurrently insert “a” and “b” into an empty list. The result is [“a””b”] which can’t be parsed.
The answer to both of these problems is to use CRDTs which understand the shape of your data structure. Eg, use a json OT/crdt system for json data (like sharedb or automerge). Likewise, if the user is editing rich text in prosemirror then you want a rich text crdt like peritext. Rich text CRDTs add the concept of annotations - so if two users bold overlapping regions of text, the crdt understands that the result should be that the entire region is bolded. And that can be translated back to markdown if you want.
The ink & switch people did a great write up of how this sort of crdt works here: https://www.inkandswitch.com/peritext/
- Edge cases in collaborative rich text editing (2021)
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You might not need a CRDT
> I'm looking out for practical CRDT ideas that works well with richtext.
Have you seen Peritext from Ink & Switch? https://www.inkandswitch.com/peritext/ It's relatively new, but is a CRDT aimed at rich text!
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CRDTs make multiplayer text editing part of Zed's DNA
To put it in a different perspective, plain text editing has well-solved CRDT patterns. But, semantic data-structures like rich-text or syntax trees is what's tricky and has unsolved challenges.
Peritext[1] is the only one that came close to solving rich-text, but even that one left out important aspect of rich-text editing like handling list & table operations as "work to be done later".
For people interested on why it's difficult to build CRDTs for richtext, here's a piece I wrote a year back: https://writer.zohopublic.com/writer/published/grcwy5c699d67...
Related HN discussion: https://news.ycombinator.com/item?id=29433896
[1] https://github.com/inkandswitch/peritext
- Peritext – A CRDT for Rich-Text Collaboration
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Evan Wallace CRDT Algorithms
Anyone unsure of what a CRDT is, this is the perfect intro: https://www.inkandswitch.com/peritext/
The two most widely used CRDT implementations (combining JSON like general purpose types and rich text editing types) are:
- Automerge https://github.com/automerge/automerge
- Yjs https://github.com/yjs/yjs
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Is Svelte capable of a Google Docs & Sheets clone?
Svelte is, but that is your smallest problem. You want to look into CRDTs (conflict-free replicated data types) to offer true (offline) collaboration. A popular JS library to solve this complex problem is called [automerge](Conflict-free replicated data type). A rather recent development in that area specifically for text-based content is Peritext. Also check out this interactive tutorial about CRDTs.
liveblocks
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Edit This Blog Post
Absolutely! The real complexity comes from conflict resolution. If someone edits the top, and someone else edits the bottom, which version do you go with? What if they're editing the same area? Entire companies exist to provide elegant solutions to this[0], so it's no simple task.
0: https://liveblocks.io/
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Show HN: I created a Chrome extension to add realtime features to any website
I can imagine, browser extensions are a pain in the butt. Are you planning to open source the code? Did you build everything by yourself or on top of https://liveblocks.io/?
- Ask HN: What's the best “dark mode” themed website and app you have come across?
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How would I adjust this gradient animation?
For the following example, I want the gradient color to flow from "Hello World" to the "Circle", so they are synchros and match the colors. I created this snippet but I'm having trouble with the rest. https://play.tailwindcss.com/accHTivCcx. Another example would be the https://liveblocks.io/'s title, which flows through the colors in the gradient. How would I achieve this?
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Liveblocks vs Firebase?
Does anyone have any opinions about using Liveblocks for a live collaboration application as opposed to just using Firebase?
- Collaborative experiences in days, not months
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Is a Multiplayer Game Possible with NextJS + Vercel?
liveblocks is great for multiplayer state sync. i was able to make my canvas redux app collaborative in a couple of hours https://liveblocks.io
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CRDTs make multiplayer text editing part of Zed's DNA
Very cool use case for CRDTs! I've seen a bunch of different use cases from other products like https://liveblocks.io/ and https://electric-sql.com/. It's interesting how CRDTs are now taking hold so much for all these collaborative syncing scenarios. Wonder what's driving the proliferation now given they've been around for awhile?
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Ask HN: Building a multiplayer, offline-capable app in 2022 (like Figma, Linear)
Hi Tim,
I'm a bit biased but https://liveblocks.io is great for that :)
If you know how to use React, that's pretty much all you need to know. It also includes some nice hooks to enable things like multiplayer undo/redo and live cursors.
The team even put a couple of interactive blog posts about that that you might find interesting:
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The new wave of JavaScript web frameworks
True! I would also include https://liveblocks.io to that list of services that help developers make multiplayer experiences.
Interesting to see more players in this space to help more and more developers do this.
What are some alternatives?
automerge - A JSON-like data structure (a CRDT) that can be modified concurrently by different users, and merged again automatically.
yjs - Shared data types for building collaborative software
y-crdt - Rust port of Yjs
Socket.io - Realtime application framework (Node.JS server)
dokieli - :bulb: dokieli is a clientside editor for decentralised article publishing, annotations and social interactions
core - Renderer for TLDraw and maybe you, too.
threlte - 3D framework for Svelte
sharedb - Realtime database backend based on Operational Transformation (OT)
automerge-rs - Rust implementation of automerge [Moved to: https://github.com/automerge/automerge]
perfect-freehand - Draw perfect pressure-sensitive freehand lines.