From 3a8fdbb8ad7f5764440c8694dec27faf09b9eb81 Mon Sep 17 00:00:00 2001
From: Bryan English <bryan@bryanenglish.com>
Date: Mon, 26 Oct 2026 13:55:04 -0400
Subject: [PATCH] ci: add a prettier check

Prettier becomes a devDependency with a lockfile, so the check is
reproducible: npm ci installs the pinned version and
npm run format:check enforces it. Markdown stays outside Prettier's
scope through .prettierignore, since its prose and table reflow churns
docs without improving consistency. The check runs on the same
triggers as the test and benchmark jobs.

Signed-off-by: Bryan English <bryan@bryanenglish.com>
---
 .github/workflows/ci.yml | 10 ++++++++++
 .gitignore               |  1 +
 .prettierignore          |  1 +
 package-lock.json        | 35 +++++++++++++++++++++++++++++++++++
 package.json             |  6 +++++-
 5 files changed, 52 insertions(+), 1 deletion(-)
 create mode 100644 .gitignore
 create mode 100644 .prettierignore
 create mode 100644 package-lock.json

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 482af0b..554d479 100644
--- a/.github/workflows/ci.yml
+++ b/.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
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..c2658d7
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+node_modules/
diff --git a/.prettierignore b/.prettierignore
new file mode 100644
index 0000000..dd44972
--- /dev/null
+++ b/.prettierignore
@@ -0,0 +1 @@
+*.md
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..fa26e29
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,35 @@
+{
+  "name": "@nodejs/microtel",
+  "version": "0.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "@nodejs/microtel",
+      "version": "0.0.0",
+      "license": "MIT",
+      "devDependencies": {
+        "prettier": "3.9.10"
+      },
+      "engines": {
+        "node": ">=26.9.0"
+      }
+    },
+    "node_modules/prettier": {
+      "version": "3.9.10",
+      "resolved": "https://registry.npmjs.org/prettier/-/prettier-3.9.10.tgz",
+      "integrity": "sha512-skGHTH1Yb9QvaTC4hWnRTzEYtCpApF0UMBPz+t/0ZPzP8ihefo/btKd+QA7pUE0fEwA1SbS/NmhyEcstdXOIdA==",
+      "dev": true,
+      "license": "MIT",
+      "bin": {
+        "prettier": "bin/prettier.cjs"
+      },
+      "engines": {
+        "node": ">=14"
+      },
+      "funding": {
+        "url": "https://github.com/prettier/prettier?sponsor=1"
+      }
+    }
+  }
+}
diff --git a/package.json b/package.json
index 53dc02c..d15c0c0 100644
--- a/package.json
+++ b/package.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"
   }
 }