feat: noSync flag for astro check (#11482)

.changeset/grumpy-dolphins-jump.md

@@ -0,0 +1,5 @@
+---
+'astro': minor
+---
+
+Adds a `--noSync` parameter to the `astro check` command to skip the type-gen step. This can be useful when running `astro check` inside packages that have Astro components, but are not Astro projects

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

@@ -24,14 +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 { default: sync } = await import('../../core/sync/index.js');
-	try {
-		await sync({ inlineConfig: flagsToAstroInlineConfig(flags) });
-	} catch (_) {
-		return process.exit(1);
+	if (!flags.noSync && !flags.help) {
+		// 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 { default: sync } = await import('../../core/sync/index.js');
+		try {
+			await sync({ inlineConfig: flagsToAstroInlineConfig(flags) });
+		} catch (_) {
+			return process.exit(1);
+		}
 	}
 
 	const { check: checker, parseArgsAsCheckConfig } = checkPackage;