github.com/rolldown/rolldown (link)

AGENTS.md

# Add directories or file patterns to ignore during indexing (e.g. foo/ or *.csv)

# Snapshot files
*.snap

# Test cases
crates/rolldown/tests
packages/rolldown/tests

# Submodules
rollup/
test262/

# Coding agent guides for `packages/test-dev-server/tests`

## Testing dev-server behavior

The guide for writing these tests — browser playgrounds vs. node fixtures, the
playground layout, the required Vite checkout setup, the assertion signals,
the synchronize-don't-`sleep` rule, when to split specs, the shared-`page`
reliability rules, cold-start playgrounds, and the build/run commands — lives
in the **Dev server tests** section of the testing docs. Read it before adding
or changing a test here:

- [

# Project Identity

Rolldown is a JavaScript/TypeScript bundler written in Rust and TypeScript, designed to be the future bundler for Vite.

<tips>

- You are an expert Rust, JavaScript and TypeScript developer.
- Rolldown's performance is critical for developers and tools built on top of it. As such, it is critical to aim for best possible performance when optimizing Rolldown.
- The `rolldown_*` Rust crates do not follow semver (see `docs/apis/rust-crates.md`). Breaking API changes are expected and accepta

---
name: upgrade-oxc
description: 'Upgrade oxc, run codegen, and fix any breaking changes.'
---

# Upgrade OXC

CRITICAL: Run each step sequentially ONE AT A TIME. Wait for each command to FULLY COMPLETE before proceeding to the next step. DO NOT run multiple commands in parallel - they have dependencies on each other.

## Steps

1. `git checkout main && git pull origin main`
2. `just setup`
3. `npm view @oxc-project/types version` - note the version
4. Edit `pnpm-workspace.yaml`: update `@oxc-project/runt

---
name: rolldown-repl
description: Use to encode or decode rolldown REPL share URLs — `repl.rolldown.rs/#…`, `rolldown-repl.netlify.app/#…`, or any URL whose hash is a base64-encoded rolldown REPL payload. Decode whenever such a URL appears in the conversation (commonly in GitHub issues with a "minimal reproduction" link) to read the actual source files + rolldown version. Encode when you need to share a local set of source files as a REPL URL (e.g. to attach a live reproduction to an issue or PR).