rtk-ai/rtk

bug: rtk proxy bun run lint reorders output line vs raw command

Open

#187 opened on Feb 18, 2026

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Description

Summary

rtk proxy bun run lint preserves exit code and total size, but changes line ordering versus raw command output.

In repro below, Bun command echo line ($ eslint ...) moves from first line to near the end.

Environment

  • rtk: 0.20.0
  • bun: 1.3.9
  • project: ~/Projects/pricedrop/apps/pricedrop
  • checked on: 18 February 2026

Reproduction

cd ~/Projects/pricedrop/apps/pricedrop
bun run lint > /tmp/raw.log 2>&1
rtk proxy bun run lint > /tmp/proxy.log 2>&1

Both commands return exit 1 and same size (641 lines, 49523 bytes), but:

diff -u /tmp/raw.log /tmp/proxy.log | sed -n "1,20p"

shows first-line removal:

- $ eslint entrypoints src test *.mjs *.ts --ignore-pattern .output

and tail shows this line near the end in proxy output.

Expected

rtk proxy should keep raw output order (strict fidelity mode).

Actual

One Bun metadata line is reordered.

Impact

Low severity, but breaks strict byte or line-order parity assumptions for machine checks on proxy output.

Contributor guide

Tech stack
rust
Domain
cli
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Rust basicsCLI output buffering
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
75
Research direction
Investigate the output handling in the proxy module (likely src/proxy.rs or similar). Look at how the command output is captured and forwarded. The issue suggests that Bun's echo line (`$ eslint ...`) is being reordered. Check if there is any buffering or interleaving of stdout and stderr. Review comments in the issue for any maintainer hints about the expected behavior.