Run benchmarks using tinybench and CodSpeed (#404)

.github/workflows/test.yml

@@ -64,3 +64,20 @@ jobs:
         uses: codecov/[email protected]
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
+
+  benchmark:
+    name: Benchmark
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Use Node.js
+        uses: actions/setup-node@v4
+        with:
+          cache: "npm"
+      - name: Install dependencies
+        run: npm install --ignore-scripts --no-audit --no-fund
+      - name: Run benchmarks
+        uses: CodSpeedHQ/action@v2
+        with:
+          token: ${{ secrets.CODSPEED_TOKEN }}
+          run: npm run benchmark

benchmark/benchmark.js

@@ -0,0 +1,26 @@
+import { Bench } from "tinybench"
+import { withCodSpeed } from "@codspeed/tinybench-plugin"
+import * as fs from "fs"
+import { analyze } from '../src/index.js'
+
+let filelist = fs.readdirSync('./src/__fixtures__')
+let files = filelist
+  .filter(filename => filename.endsWith('.css'))
+  .filter(filename => filename.includes('css-tricks'))
+  .reduce((acc, filename) => {
+    let css = fs.readFileSync(`./src/__fixtures__/${filename}`, 'utf8')
+    acc.set(filename, css)
+    return acc
+  }, new Map())
+
+let bench = withCodSpeed(new Bench())
+
+for (let [filename, css] of files) {
+  let byte_size = (Buffer.byteLength(css) / 1024).toFixed(1)
+  bench.add(`${filename} (${byte_size}kB)`, () => analyze(css))
+}
+
+await bench.warmup()
+await bench.run()
+
+console.table(bench.table())