fix: merge userConfig inside getViteConfig

.changeset/tidy-days-decide.md

@@ -0,0 +1,5 @@
+---
+'astro': patch
+---
+
+Fixes an issue where the function `getViteConfig` wasn't returning the correct merged Astro configuration

packages/astro/src/config/index.ts

@@ -34,7 +34,7 @@ export function getViteConfig(inlineConfig: UserConfig, inlineAstroConfig: Astro
 			dest: nodeLogDestination,
 			level: 'info',
 		});
-		const { astroConfig: config } = await resolveConfig(inlineAstroConfig, cmd);
+		const { astroConfig: config, userConfig } = await resolveConfig(inlineAstroConfig, cmd);
 		let settings = await createSettings(config, inlineConfig.root);
 		settings = await runHookConfigSetup({ settings, command: cmd, logger });
 		const viteConfig = await createVite(
@@ -48,6 +48,6 @@ export function getViteConfig(inlineConfig: UserConfig, inlineAstroConfig: Astro
 			{ settings, logger, mode }
 		);
 		await runHookConfigDone({ settings, logger });
-		return mergeConfig(viteConfig, inlineConfig);
+		return mergeConfig(viteConfig, userConfig);
 	};
 }

packages/astro/src/core/config/config.ts

@@ -199,5 +199,5 @@ export async function resolveConfig(
 	const mergedConfig = mergeConfig(userConfig, inlineUserConfig);
 	const astroConfig = await validateConfig(mergedConfig, root, command);
 
-	return { userConfig, astroConfig };
+	return { userConfig: mergedConfig, astroConfig };
 }