Version Packages #95

	name: Benchmark
	permissions:
	contents: read

	on:
	pull_request:
	branches:
	- main

	# Only the latest commit on a PR needs benchmarking.
	concurrency:
	group: benchmark-${{ github.event.pull_request.number }}
	cancel-in-progress: true

	jobs:
	benchmark:
	runs-on: ubuntu-latest

	steps:
	- name: Checkout (full history for the base ref)
	uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
	with:
	fetch-depth: 0

	- name: Use Node.js 22.x
	uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0
	with:
	node-version: 22.x

	- uses: oven-sh/setup-bun@0c5077e51419868618aeaa5fe8019c62421857d6 # v2.2.0
	name: Install Bun
	with:
	bun-version: 1.4.0

	# Build + pack the PR (head) build under test.
	- name: Build and pack head
	run: \|
	bun install
	bun run build --filter ultracite
	cd packages/cli
	npm pack --loglevel=error
	mv ultracite-*.tgz "$GITHUB_WORKSPACE/head.tgz"

	# Build + pack the PR's base (main) build in a worktree, on the same
	# runner, so the comparison cancels out machine speed.
	- name: Build and pack base
	run: \|
	git worktree add /tmp/ultracite-base ${{ github.event.pull_request.base.sha }}
	cd /tmp/ultracite-base
	bun install
	bun run build --filter ultracite
	cd packages/cli
	npm pack --loglevel=error
	mv ultracite-*.tgz "$GITHUB_WORKSPACE/base.tgz"

	# Interleaved head-vs-base benchmark. Fails the job on a statistically
	# significant regression (see benchmark/README.md for the gate).
	- name: Run benchmark
	run: bun ./benchmark/index.ts --base base.tgz --head head.tgz

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