fix: log error if --config-name is used without multiple configs (#1874)

Author: snitin315

packages/webpack-cli/lib/groups/ConfigGroup.js

@@ -163,21 +163,27 @@ const finalize = async (moduleObj, args) => {
         const newOptions = configOptions(formattedEnv, args);
         // When config function returns a promise, resolve it, if not it's resolved by default
         newOptionsObject['options'] = await Promise.resolve(newOptions);
-    } else if (Array.isArray(configOptions) && configName) {
-        // In case of exporting multiple configurations, If you pass a name to --config-name flag,
-        // webpack will only build that specific configuration.
-        const namedOptions = configOptions.filter((opt) => configName.includes(opt.name));
-        if (namedOptions.length === 0) {
-            logger.error(`Configuration with name "${configName}" was not found.`);
-            process.exit(2);
+    } else if (configName) {
+        if (Array.isArray(configOptions) && configOptions.length > 1) {
+            // In case of exporting multiple configurations, If you pass a name to --config-name flag,
+            // webpack will only build that specific configuration.
+            const namedOptions = configOptions.filter((opt) => configName.includes(opt.name));
+            if (namedOptions.length === 0) {
+                logger.error(`Configuration with name "${configName}" was not found.`);
+                process.exit(2);
+            } else {
+                newOptionsObject['options'] = namedOptions;
+            }
         } else {
-            newOptionsObject['options'] = namedOptions;
+            logger.error('Multiple configurations not found. Please use "--config-name" with multiple configurations.');
+            process.exit(2);
         }
     } else {
         if (Array.isArray(configOptions) && !configOptions.length) {
             newOptionsObject['options'] = {};
             return newOptionsObject;
         }
+
         newOptionsObject['options'] = configOptions;
     }
 

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 error 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).toBeFalsy();
+    });
 });

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',
+};