From 00f99abc430d22c252a247ad63b25e2962d9102e Mon Sep 17 00:00:00 2001
From: Nitin Kumar <snitin315@gmail.com>
Date: Mon, 5 Oct 2020 19:42:36 +0530
Subject: [PATCH] fix: log warning if --config-name is used without multiple
 configs

---
 packages/webpack-cli/lib/groups/ConfigGroup.js | 3 +++
 test/config-name/config-name.test.js           | 6 ++++++
 test/config-name/single-config.js              | 8 ++++++++
 3 files changed, 17 insertions(+)
 create mode 100644 test/config-name/single-config.js

diff --git a/packages/webpack-cli/lib/groups/ConfigGroup.js b/packages/webpack-cli/lib/groups/ConfigGroup.js
index 9d4bffd759a..057f38307bf 100644
--- a/packages/webpack-cli/lib/groups/ConfigGroup.js
+++ b/packages/webpack-cli/lib/groups/ConfigGroup.js
@@ -178,6 +178,9 @@ const finalize = async (moduleObj, args) => {
             newOptionsObject['options'] = {};
             return newOptionsObject;
         }
+        if (configName) {
+            logger.warn('Multiple configurations not found. Please use "--config-name" with multiple configurations.');
+        }
         newOptionsObject['options'] = configOptions;
     }
 
diff --git a/test/config-name/config-name.test.js b/test/config-name/config-name.test.js
index dfc9c8ba805..40cf10af51e 100644
--- a/test/config-name/config-name.test.js
+++ b/test/config-name/config-name.test.js
@@ -43,4 +43,10 @@ describe('--config-name flag', () => {
         expect(stderr).toContain('Configuration with name "test" was not found.');
         expect(stdout).toBeFalsy();
     });
+
+    it('should log warning if multiple configurations are not found', () => {
+        const { stderr, stdout } = run(__dirname, ['--config-name', 'test', '-c', 'single-config.js'], false);
+        expect(stderr).toContain('Multiple configurations not found. Please use "--config-name" with multiple configurations');
+        expect(stdout).toContain('dist-single.js');
+    });
 });
diff --git a/test/config-name/single-config.js b/test/config-name/single-config.js
new file mode 100644
index 00000000000..e5fff043bc6
--- /dev/null
+++ b/test/config-name/single-config.js
@@ -0,0 +1,8 @@
+module.exports = {
+    output: {
+        filename: './dist-single.js',
+    },
+    name: 'first',
+    entry: './src/first.js',
+    mode: 'development',
+};