benchmarks in codspeed

.github/workflows/benchmark.yml

@@ -0,0 +1,29 @@
+name: Benchmark
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+  workflow_dispatch:
+
+env:
+  MISE_IDIOMATIC_VERSION_FILE_ENABLE_TOOLS: node,pnpm
+
+jobs:
+  benchmarks:
+    name: Run benchmarks (walltime, memory)
+    runs-on: codspeed-macro-arm64-graviton-ubuntu-22-04
+    permissions:
+      contents: read
+      id-token: write
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
+      - uses: jdx/mise-action@c2a87611a18de5b3828c5652fe268e992400cb5c # v4.3.0
+      - run: pnpm install --frozen-lockfile
+      - name: Run benchmarks with CodSpeed
+        uses: CodSpeedHQ/action@78102a468f96d8e0ccb92d0ec49425753fc42062 # v5
+        with:
+          mode: walltime,memory
+          run: pnpm bench

package.json

@@ -29,23 +29,26 @@
 	"scripts": {
 		"dev": "bsh dev",
 		"build": "pnpm --filter \"@clack/*\" run build",
+		"bench": "pnpm -r --workspace-concurrency=1 --if-present bench",
 		"format": "bsh format",
 		"format:check": "bsh format --check",
 		"lint": "bsh lint .",
 		"test": "bsh test"
 	},
 	"devDependencies": {
 		"@bomb.sh/tools": "^0.8.0",
+		"@codspeed/vitest-plugin": "6.1.0",
 		"@termless/core": "^0.10.2",
 		"@termless/test": "^0.10.2",
 		"@types/node": "^22.20.0",
-		"node-pty": "1.2.0-beta.15"
+		"node-pty": "1.2.0-beta.15",
+		"vitest": "5.0.5"
 	},
 	"devEngines": {
 		"packageManager": {
 			"name": "pnpm",
 			"version": "10.7.0",
-			"onFail": "error"
+			"onFail": "warn"
 		},
 		"runtime": {
 			"name": "node",

packages/ui/bench/README.md

@@ -3,9 +3,13 @@
 Run the full Vitest `createUI` frame benchmark matrix with:
 
 ```sh
-pnpm --filter @clack/ui bench
+pnpm bench
 ```
 
+The same command runs in CodSpeed on pushes to `main` and pull requests. CI uses
+walltime for elapsed time, including async frame output, then runs the benchmarks
+again with memory tracking to report allocations and peak memory.
+
 `createUI()` and fixture construction are outside the timed
 sample. The initial-render comparison measures starting `ui.main()` through its first
 output callback. Each update workload compares six tree shapes at 100, 500, 1,000, and