Fix examples check hang (#7998)

.changeset/gentle-deers-yawn.md

@@ -0,0 +1,5 @@
+---
+'astro': patch
+---
+
+Call `astro sync` once before calling `astro check`

package.json

@@ -76,6 +76,7 @@
     "astro-benchmark": "workspace:*"
   },
   "devDependencies": {
+    "@astrojs/check": "^0.1.0",
     "@changesets/changelog-github": "^0.4.8",
     "@changesets/cli": "^2.26.1",
     "@types/node": "^18.16.18",

packages/astro/src/cli/check/index.ts

@@ -1,7 +1,7 @@
 import path from 'node:path';
 import type { Arguments } from 'yargs-parser';
 import { error, info } from '../../core/logger/core.js';
-import { createLoggingFromFlags } from '../flags.js';
+import { createLoggingFromFlags, flagsToAstroInlineConfig } from '../flags.js';
 import { getPackage } from '../install-package.js';
 
 export async function check(flags: Arguments) {
@@ -24,6 +24,16 @@ export async function check(flags: Arguments) {
 		return;
 	}
 
+	// Run sync before check to make sure types are generated.
+	// NOTE: In the future, `@astrojs/check` can expose a `before lint` hook so that this works during `astro check --watch` too.
+	// For now, we run this once as usually `astro check --watch` is ran alongside `astro dev` which also calls `astro sync`.
+	const { sync } = await import('../../core/sync/index.js');
+	const inlineConfig = flagsToAstroInlineConfig(flags);
+	const exitCode = await sync(inlineConfig);
+	if (exitCode !== 0) {
+		process.exit(exitCode);
+	}
+
 	const { check: checker, parseArgsAsCheckConfig } = checkPackage;
 
 	const config = parseArgsAsCheckConfig(process.argv);