Rushlight

Judgement

What it is

Building block

What it does

Client and server packages that add real-time collaborative editing with live cursors to CodeMirror 6, using a stateless backend, Redis and your own database.

Adopt it when

You are adding collaborative code or Markdown editing to a web app and want server-resolved operational transformation without a cloud service.

Watch out

The author describes it as an experiment, it is on version 0.1, and it has seen little activity since mid-2025.

Ready for

Experimental

Runs as

Library

Built with

TypeScript, CodeMirror, Redis and PostgreSQL

How established

Established: started 3 years ago, latest release v0.1.2.

What the license allows

You can build it into a product you sell, as long as you keep its copyright notice.

Judged on 2026-11-06 from the project's README and GitHub data. The license and age lines are worked out directly.

Built from

Follow it down: Rushlight → TypeScript → Go → runs on a microchip

How compilers were built, back to punched paper tape

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