diff --git a/.changeset/brown-jeans-cover.md b/.changeset/brown-jeans-cover.md
new file mode 100644
index 000000000000..dafd96712ec0
--- /dev/null
+++ b/.changeset/brown-jeans-cover.md
@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+Return the copied files from the adapter's copy\_ utils.
diff --git a/packages/kit/src/core/adapt/utils.js b/packages/kit/src/core/adapt/utils.js
index 12623819b611..764f84309ac0 100644
--- a/packages/kit/src/core/adapt/utils.js
+++ b/packages/kit/src/core/adapt/utils.js
@@ -19,15 +19,15 @@ export function get_utils({ cwd, config, build_data, log }) {
 		copy,
 
 		copy_client_files(dest) {
-			copy(`${cwd}/${SVELTE_KIT}/output/client`, dest, (file) => file[0] !== '.');
+			return copy(`${cwd}/${SVELTE_KIT}/output/client`, dest, (file) => file[0] !== '.');
 		},
 
 		copy_server_files(dest) {
-			copy(`${cwd}/${SVELTE_KIT}/output/server`, dest, (file) => file[0] !== '.');
+			return copy(`${cwd}/${SVELTE_KIT}/output/server`, dest, (file) => file[0] !== '.');
 		},
 
 		copy_static_files(dest) {
-			copy(config.kit.files.assets, dest);
+			return copy(config.kit.files.assets, dest);
 		},
 
 		async prerender({ all = false, dest, fallback }) {
diff --git a/packages/kit/types/config.d.ts b/packages/kit/types/config.d.ts
index 3e509fa0981d..5d2214d0eacb 100644
--- a/packages/kit/types/config.d.ts
+++ b/packages/kit/types/config.d.ts
@@ -6,10 +6,27 @@ export interface AdapterUtils {
 	log: Logger;
 	rimraf(dir: string): void;
 	mkdirp(dir: string): void;
-	copy_client_files(dest: string): void;
-	copy_server_files(dest: string): void;
-	copy_static_files(dest: string): void;
-	copy(from: string, to: string, filter?: (basename: string) => boolean): void;
+	/**
+	 * @param dest the destination folder to which files should be copied
+	 * @returns an array of paths corresponding to the files that have been created by the copy
+	 */
+	copy_client_files(dest: string): string[];
+	/**
+	 * @param dest the destination folder to which files should be copied
+	 * @returns an array of paths corresponding to the files that have been created by the copy
+	 */
+	copy_server_files(dest: string): string[];
+	/**
+	 * @param dest the destination folder to which files should be copied
+	 * @returns an array of paths corresponding to the files that have been created by the copy
+	 */
+	copy_static_files(dest: string): string[];
+	/**
+	 * @param from the source folder from which files should be copied
+	 * @param to the destination folder to which files should be copied
+	 * @returns an array of paths corresponding to the files that have been created by the copy
+	 */
+	copy(from: string, to: string, filter?: (basename: string) => boolean): string[];
 	prerender(options: { all?: boolean; dest: string; fallback?: string }): Promise<void>;
 }