fix: "chunks" directory appears in build output, if custom modules ar…

…e imported in Astro files (#4868)

.changeset/yellow-donuts-destroy.md

@@ -0,0 +1,5 @@
+---
+'astro': patch
+---
+
+remove all the ssr generated folders in static build if only empty

packages/astro/src/core/build/static-build.ts

@@ -1,5 +1,6 @@
 import glob from 'fast-glob';
 import fs from 'fs';
+import path from 'path';
 import { bgGreen, bgMagenta, black, dim } from 'kleur/colors';
 import { fileURLToPath } from 'url';
 import * as vite from 'vite';
@@ -246,12 +247,34 @@ async function cleanSsrOutput(opts: StaticBuildOptions) {
 	const files = await glob('**/*.mjs', {
 		cwd: fileURLToPath(out),
 	});
-	await Promise.all(
-		files.map(async (filename) => {
-			const url = new URL(filename, out);
-			await fs.promises.rm(url);
-		})
-	);
+	if (files.length) {
+		// Remove all the SSR generated .mjs files
+		await Promise.all(
+			files.map(async (filename) => {
+				const url = new URL(filename, out);
+				await fs.promises.rm(url);
+			})
+		);
+		// Map directories heads from the .mjs files
+		const directories: Set<string> = new Set();
+		files.forEach((i) => {
+			const splitFilePath = i.split(path.sep);
+			// If the path is more than just a .mjs filename itself
+			if (splitFilePath.length > 1) {
+				directories.add(splitFilePath[0]);
+			}
+		});
+		// Attempt to remove only those folders which are empty
+		await Promise.all(
+			Array.from(directories).map(async (filename) => {
+				const url = new URL(filename, out);
+				const folder = await fs.promises.readdir(url);
+				if (!folder.length) {
+					await fs.promises.rmdir(url, { recursive: true });
+				}
+			})
+		);
+	}
 	// Clean out directly if the outDir is outside of root
 	if (out.toString() !== opts.settings.config.outDir.toString()) {
 		// Copy assets before cleaning directory if outside root