From c47150c42c980b297c747a17d79bd6722a65fb84 Mon Sep 17 00:00:00 2001
From: Tobias Koppers <tobias.koppers@googlemail.com>
Date: Tue, 17 Apr 2018 11:39:25 +0200
Subject: [PATCH] Clone optimization config in Defaulter

#6565
---
 lib/WebpackOptionsDefaulter.js           | 1 +
 test/cases/chunks/runtime/test.filter.js | 4 ++++
 2 files changed, 5 insertions(+)
 create mode 100644 test/cases/chunks/runtime/test.filter.js

diff --git a/lib/WebpackOptionsDefaulter.js b/lib/WebpackOptionsDefaulter.js
index 1cd910011..d9e6e36c9 100644
--- a/lib/WebpackOptionsDefaulter.js
+++ b/lib/WebpackOptionsDefaulter.js
@@ -193,6 +193,7 @@ class WebpackOptionsDefaulter extends OptionsDefaulter {
 			options => (isProductionLikeMode(options) ? "warning" : false)
 		);
 
+		this.set("optimization", "call", value => Object.assign({}, value));
 		this.set("optimization.removeAvailableModules", true);
 		this.set("optimization.removeEmptyChunks", true);
 		this.set("optimization.mergeDuplicateChunks", true);
diff --git a/test/cases/chunks/runtime/test.filter.js b/test/cases/chunks/runtime/test.filter.js
new file mode 100644
index 000000000..3ed2e8ae9
--- /dev/null
+++ b/test/cases/chunks/runtime/test.filter.js
@@ -0,0 +1,4 @@
+module.exports = function(config) {
+	// This test can't run in development mode as it depends on the flagIncludedChunks optimization
+	return config.mode !== "development";
+};