Undo Is a Stack of Your Own Mistakes
Ctrl+Z is trivial in a single user app. Add one collaborator and the obvious implementation starts erasing other people's work.
#frontend
6 posts
The Server Forgets Everything and That's Fine
Rooms live in memory and get thrown away. The client is the persistence layer, which changes what reconnecting means.
Cursors Are Not Part of the Document
Presence looks like the easiest feature in a collaborative app. It has the tightest constraints of anything in the system.
Real-Time Collaboration Is Not Just Sending Updates
Two people editing the same canvas is not a networking problem. It's an agreement problem.
Why Freehand Drawing Becomes a Bottleneck
Freehand input looks simple, but the amount of data it generates can quickly overwhelm your rendering system.
Inside the Rendering Engine of a Canvas App
Rendering isn’t just about drawing shapes. It’s about controlling how much work happens per frame.