On: Show HN: CodeTracer – A time-traveling debugger implemented in Nim and Rust

[pzo]

I love it, I always wished for something like that. Will try to later test with python. Wish there was also for JS/TS. As for rr debugger did it got by now any support for MacOS or Windows or Android? I'm also wondering how heavy are those recording for typical apps.

This would be also great for LLM to give some context via MCP server or even let LLM pick what variables history wanna see instead of giving full recording file.

Also nice would be some recording filtering that you wanna e.g. pick few variables and display history during whole execution maybe with some specific formating and maybe even for some numeric variables or like tensors, images, etc pass to rerun for visual debugging so you can see plot it

[alehander42 → pzo]

Thank you!

The Python initial prototype is not yet finished. It's easy to play with, so anyone interested can actually work on it! Currently, in the experimental tracers, Ruby is usable for smaller programs, so one can try Ruby immediately.

I do plan on improving some of the prototypes, and on adding additional ones: for Lua, but JavaScript: e.g. v8 is also a good target. Scripting language users that find it useful, are welcome to discuss/chat with us, or even directly contribute or propose support for new languages.

A form of record filtering is planned indeed.

We have experimented with automatic chart visualizations of some things, we've planned custom visual representation as well, great to see interest in those

[anougaret → pzo]

I just released a JS/TS/Python time travel debugger that overlays variable values on top of vscode. It's just a npm or pip install and VsCode extension so it might be easier to use for you: https://github.com/dedale-dev/ariana I'm also planning to add MCP integration today actually!

[vlovich123 → pzo]

> Wish there was also for JS/TS.

There’s Replay for browsers and Wallaby for Node.