fix: derive Renovate example exclusions from metadata

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Author: yamcodes

.github/renovate.json

@@ -54,19 +54,23 @@
 		},
 		// By Package Manager
 		{
-			// Disable the whole sync-generated example tree so new examples are covered
-			// automatically without updating this list every time.
+			// Generated from apps/playgrounds/*/package.json arkenvExamples metadata.
 			"description": "Disable sync-generated example apps",
-			"matchFileNames": ["examples/**"],
-			"enabled": false
-		},
-		{
-			"description": "Allow hand-maintained examples to keep updating via the pnpm group",
 			"matchFileNames": [
-				"examples/with-zod/**",
-				"examples/with-valibot/**"
+			// BEGIN GENERATED SYNC EXAMPLES
+				"examples/basic/**",
+				"examples/basic-js/**",
+				"examples/with-bun/**",
+				"examples/with-bun-react/**",
+				"examples/with-nextjs/**",
+				"examples/with-nextjs-strict/**",
+				"examples/with-nuxt/**",
+				"examples/with-solid-start/**",
+				"examples/with-standard-schema/**",
+				"examples/with-vite-react/**"
+			// END GENERATED SYNC EXAMPLES
 			],
-			"enabled": true
+			"enabled": false
 		},
 		{
 			// Group pnpm workspace updates (minor/patch) across selected dirs

scripts/sync-examples.js

@@ -17,6 +17,7 @@ import { existsSync, readdirSync, readFileSync } from "node:fs";
 import { basename, join } from "node:path";
 import { argv } from "node:process";
 import { PLAYGROUNDS_DIR } from "./sync-lib/constants.js";
+import { syncRenovateConfig } from "./sync-lib/renovate.js";
 import { syncPlayground } from "./sync-lib/sync.js";
 import { parseCatalog } from "./sync-lib/workspace.js";
 
@@ -39,6 +40,7 @@ function main() {
 		.map((d) => join(PLAYGROUNDS_DIR, d.name));
 
 	let hasChanges = false;
+	const generatedExampleNames = [];
 
 	for (const playgroundPath of playgroundDirs) {
 		const pkgPath = join(playgroundPath, "package.json");
@@ -65,6 +67,7 @@ function main() {
 				continue;
 			}
 
+			generatedExampleNames.push(exampleConfig.name);
 			const changes = syncPlayground(
 				playgroundPath,
 				exampleConfig,
@@ -82,6 +85,11 @@ function main() {
 		}
 	}
 
+	if (syncRenovateConfig(generatedExampleNames, checkOnly)) {
+		hasChanges = true;
+		console.log("\n  ✗ Renovate config is out of sync with playground metadata.");
+	}
+
 	if (checkOnly) {
 		if (hasChanges) {
 			console.log("\n❌ Examples are out of sync with playgrounds.");

scripts/sync-lib/renovate.js

@@ -0,0 +1,50 @@
+import { readFileSync, writeFileSync } from "node:fs";
+import { join } from "node:path";
+import { ROOT_DIR } from "./constants.js";
+
+const RENOVATE_CONFIG_PATH = join(ROOT_DIR, ".github", "renovate.json");
+const START_MARKER = "// BEGIN GENERATED SYNC EXAMPLES";
+const END_MARKER = "// END GENERATED SYNC EXAMPLES";
+
+function generatedMatchFileNames(exampleNames) {
+	return [
+		`\t\t\t${START_MARKER}`,
+		...exampleNames.flatMap((name, index) => [
+			`\t\t\t\t"examples/${name}/**"${index === exampleNames.length - 1 ? "" : ","}`,
+		]),
+		`\t\t\t${END_MARKER}`,
+	].join("\n");
+}
+
+/**
+ * Keep Renovate's generated-example exclusion in sync with playground metadata.
+ */
+export function syncRenovateConfig(exampleNames, checkOnly = false) {
+	const content = readFileSync(RENOVATE_CONFIG_PATH, "utf8");
+	const markerStart = content.indexOf(START_MARKER);
+	const start = content.lastIndexOf("\n", markerStart) + 1;
+	const end = content.indexOf(END_MARKER);
+
+	if (markerStart === -1 || end === -1 || end < start) {
+		throw new Error(
+			`Renovate config must contain ${START_MARKER} and ${END_MARKER}`,
+		);
+	}
+
+	const generated = generatedMatchFileNames([...new Set(exampleNames)].sort());
+	const current = content.slice(start, end + END_MARKER.length);
+	const updated =
+		content.slice(0, start) +
+		generated +
+		content.slice(end + END_MARKER.length);
+
+	if (checkOnly) {
+		return current !== generated;
+	}
+
+	if (current !== generated) {
+		writeFileSync(RENOVATE_CONFIG_PATH, updated);
+	}
+
+	return false;
+}