feat: run examples as an external test

Author: gamemaker1

.github/workflows/ci.yaml

@@ -42,9 +42,29 @@ jobs:
         run: |
           npm ci
           npm run test:lib
+  test-examples:
+    name: Test (Examples)
+    strategy:
+      matrix:
+        node-version: [lts/*]
+        os: [ubuntu-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - name: Checkout the repository
+        uses: actions/checkout@v3
+      - name: Use Node ${{ matrix.node-version }}
+        uses: actions/setup-node@v3
+        with:
+          node-version: ${{ matrix.node-version }}
+      - name: Run tests
+        run: |
+          npm ci
+          cd examples/
+          npm ci
+          npm test
   publish:
     name: Publish
-    needs: [lint, test-library]
+    needs: [lint, test-library, test-examples]
     if: startsWith(github.ref, 'refs/tags/v')
     runs-on: ubuntu-latest
     steps:

examples/.npmrc

@@ -0,0 +1,6 @@
+# .npmrc
+# Configuration for npm and pnpm
+
+# Uses the exact version instead of any within-patch-range version of an
+# installed package
+save-exact=true

examples/combined-fetch.js

@@ -0,0 +1,48 @@
+// /examples/draft-7-fetch.example.ts
+// Use `fetch`, and parse the `RateLimit` header from the IETF spec's 7th draft.
+
+// Note that example has a server and client together - normally they'd be in
+// separate files, likely on separate devices.
+
+// ---
+// `server.ts`
+// ----
+
+import { default as express } from 'express'
+import { rateLimit } from 'express-rate-limit'
+
+// Create a rate-limited server.
+const app = express()
+app.use(
+	rateLimit({
+		max: 5,
+		windowMs: 60 * 1000, // 1 minute windows.
+		legacyHeader: false, // Disable the `X-RateLimit-*` headers.
+		standardHeaders: 'draft-7', // Use the combined `RateLimit` header.
+	}),
+)
+
+// Register routes, and start the server.
+app.get('/', (req, res) => res.send('Hallo there!'))
+const { port, server } = await new Promise((resolve) => {
+	const server = app.listen(0, () =>
+		resolve({ port: server.address().port, server }),
+	)
+})
+
+// ---
+// `client.ts`
+// ---
+
+import { parseRateLimit } from 'ratelimit-header-parser'
+
+// Fetch a response from the server.
+const response = await fetch(`http://localhost:${port}`)
+
+console.log('`RateLimit` header content:', response.headers.get('RateLimit'))
+// > `RateLimit` header content: limit=5, remaining=4, reset=60
+console.log('parsed rate limit info:', parseRateLimit(response))
+// > parsed rate limit info: { limit: 5, used: 1, remaining: 4, reset: 2023-08-25T04:41:31.546Z }
+
+// Cleanup the server.
+server.close()

examples/draft-7-fetch.example.ts

@@ -1,3 +1,6 @@
+// /examples/github-fetch.example.ts
+// Uses `fetch` to hit the Github API.
+
 import { parseRateLimit } from 'ratelimit-header-parser'
 
 const response = await fetch(