From 5ff9a1486f321122595d94cf9159aebff994c721 Mon Sep 17 00:00:00 2001
From: Tobias Koppers <tobias.koppers@googlemail.com>
Date: Mon, 22 Feb 2021 09:03:03 +0100
Subject: [PATCH 1/2] add test case

---
 test/Defaults.unittest.js | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/test/Defaults.unittest.js b/test/Defaults.unittest.js
index 166dedd11b0..ba1c3f6b033 100644
--- a/test/Defaults.unittest.js
+++ b/test/Defaults.unittest.js
@@ -1703,4 +1703,24 @@ describe("Defaults", () => {
 			process.chdir(cwd);
 		}
 	);
+
+	test(
+		"array defaults",
+		{
+			output: {
+				enabledChunkLoadingTypes: ["require", "..."],
+				enabledWasmLoadingTypes: ["...", "async-node"]
+			}
+		},
+		e =>
+			e.toMatchInlineSnapshot(`
+			- Expected
+			+ Received
+
+			@@ ... @@
+			+       "require",
+			@@ ... @@
+			+       "async-node",
+		`)
+	);
 });

From e63e73371324bee6bc45d40c0dd37726f064ab7b Mon Sep 17 00:00:00 2001
From: Tobias Koppers <tobias.koppers@googlemail.com>
Date: Mon, 22 Feb 2021 09:03:12 +0100
Subject: [PATCH 2/2] fix array expansion when using "..."

---
 lib/config/defaults.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/config/defaults.js b/lib/config/defaults.js
index d45303d81e5..451626f6884 100644
--- a/lib/config/defaults.js
+++ b/lib/config/defaults.js
@@ -95,7 +95,7 @@ const A = (obj, prop, factory) => {
 			const item = value[i];
 			if (item === "...") {
 				if (newArray === undefined) {
-					newArray = i > 0 ? value.slice(0, i - 1) : [];
+					newArray = value.slice(0, i);
 					obj[prop] = /** @type {T[P]} */ (/** @type {unknown} */ (newArray));
 				}
 				const items = /** @type {any[]} */ (/** @type {unknown} */ (factory()));