[fix] clear adapter-static output (#2260)

Author: ignatiusmb

.changeset/large-horses-flash.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/adapter-static': patch
+---
+
+Clear output before adapting

packages/adapter-static/index.js

@@ -1,16 +1,12 @@
-/**
- * @param {{
- *   pages?: string;
- *   assets?: string;
- *   fallback?: string;
- * }} [opts]
- */
+/** @type {import('.')} */
 export default function ({ pages = 'build', assets = pages, fallback } = {}) {
-	/** @type {import('@sveltejs/kit').Adapter} */
-	const adapter = {
+	return {
 		name: '@sveltejs/adapter-static',
 
 		async adapt({ utils }) {
+			utils.rimraf(assets);
+			utils.rimraf(pages);
+
 			utils.copy_static_files(assets);
 			utils.copy_client_files(assets);
 
@@ -21,6 +17,4 @@ export default function ({ pages = 'build', assets = pages, fallback } = {}) {
 			});
 		}
 	};
-
-	return adapter;
 }