swc

Autonomously optimize code for performance using CodSpeed benchmarks, flamegraph analysis, and iterative improvement. Use this skill whenever the user wants to make code faster, reduce CPU usage, optimize memory, improve throughput, find performance bottlenecks, or asks to 'optimize', 'speed up', 'make faster', 'reduce latency', 'improve performance', or points at a CodSpeed benchmark result wanting improvements. Also trigger when the user mentions a slow function, a regression, or wants to understand where time is spent in their code.

Set up performance benchmarks and CodSpeed harness for a project. Use this skill whenever the user wants to create benchmarks, add performance tests, set up CodSpeed, configure codspeed.yml, integrate a benchmarking framework (criterion, divan, pytest-benchmark, vitest bench, go test -bench, google benchmark), or when the user says 'add benchmarks', 'set up perf tests', 'create a benchmark', 'benchmark this', or wants to measure performance of their code for the first time. Also trigger when the optimize skill needs benchmarks that don't exist yet.

One-shot repair workflow for SWC pull requests. Use when asked to repair a PR by resolving merge conflicts, applying unresolved actionable reviews from chatgpt-codex-connector[bot], resolving those review threads, fixing failing CI, committing the repair work in coherent chunks, and pushing once at the end.

Create SWC changeset files for pull requests. Use when asked to add a changeset, prepare release notes, decide patch/minor/major bumps, or enumerate changed Rust crates for an SWC PR; the skill requires every publishable Rust crate with a breaking change or a runtime dependency breaking change to be listed as major, every other changed publishable Rust crate to be listed as patch or minor, and swc_core to be listed as at least patch for Rust crate changes.