ci: add a prettier check (#6)

Signed-off-by: Bryan English <bryan@bryanenglish.com>

Author: bengl

.github/workflows/ci.yml

@@ -32,3 +32,13 @@ jobs:
         with:
           node-version: latest
       - run: npm run bench
+
+  prettier:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v7
+      - uses: actions/setup-node@v7
+        with:
+          node-version: latest
+      - run: npm ci
+      - run: npm run format:check

.gitignore

@@ -0,0 +1 @@
+node_modules/

.prettierignore

@@ -0,0 +1 @@
+*.md

package-lock.json

@@ -27,6 +27,10 @@
   },
   "scripts": {
     "test": "node --test 'test/test-*.js'",
-    "bench": "node --experimental-bench --bench 'benchmark/*.bench.js'"
+    "bench": "node --experimental-bench --bench 'benchmark/*.bench.js'",
+    "format:check": "prettier --check ."
+  },
+  "devDependencies": {
+    "prettier": "3.9.10"
   }
 }