fix: only output when any chunk is fulfilled

src/index.js

@@ -514,8 +514,11 @@ class MiniCssExtractPlugin {
                     return [
                       ` * ${m.readableIdentifier(requestShortener)}`,
                       `   - couldn't fulfill desired order of chunk group(s) ${failedChunkGroups}`,
-                      `   - while fulfilling desired order of chunk group(s) ${goodChunkGroups}`,
-                    ].join('\n');
+                      goodChunkGroups &&
+                        `   - while fulfilling desired order of chunk group(s) ${goodChunkGroups}`,
+                    ]
+                      .filter(Boolean)
+                      .join('\n');
                   }),
                 ].join('\n')
               )

test/cases/ignoreOrderFalseWithoutGoodChunks/e1.css

@@ -0,0 +1,3 @@
+body {
+  content: 'e1';
+}

test/cases/ignoreOrderFalseWithoutGoodChunks/e2.css

@@ -0,0 +1,3 @@
+body {
+  content: 'e2';
+}

test/cases/ignoreOrderFalseWithoutGoodChunks/e3.css

@@ -0,0 +1,3 @@
+body {
+  content: 'e3';
+}

test/cases/ignoreOrderFalseWithoutGoodChunks/e4.css

@@ -0,0 +1,3 @@
+body {
+  content: 'e4';
+}

test/cases/ignoreOrderFalseWithoutGoodChunks/expected/styles.css

@@ -0,0 +1,16 @@
+body {
+  content: 'e1';
+}
+
+body {
+  content: 'e4';
+}
+
+body {
+  content: 'e2';
+}
+
+body {
+  content: 'e3';
+}
+

test/cases/ignoreOrderFalseWithoutGoodChunks/index.js

@@ -0,0 +1 @@
+import './e1.css';

test/cases/ignoreOrderFalseWithoutGoodChunks/index2.js

@@ -0,0 +1,2 @@
+import './e2.css';
+import './e1.css';

test/cases/ignoreOrderFalseWithoutGoodChunks/index3.js

@@ -0,0 +1,3 @@
+import './e3.css';
+import './e4.css';
+import './e2.css';

test/cases/ignoreOrderFalseWithoutGoodChunks/index4.js

@@ -0,0 +1,3 @@
+import './e4.css';
+import './e2.css';
+import './e3.css';

test/cases/ignoreOrderFalseWithoutGoodChunks/warnings.js

@@ -0,0 +1,27 @@
+const cssLoaderPath = require.resolve('css-loader').replace(/\\/g, '/');
+
+module.exports = [
+  '',
+  'WARNING in chunk styles [mini-css-extract-plugin]',
+  'Conflicting order. Following module has been added:',
+  ` * css ${cssLoaderPath}!./e1.css`,
+  'despite it was not able to fulfill desired ordering with these modules:',
+  ` * css ${cssLoaderPath}!./e2.css`,
+  "   - couldn't fulfill desired order of chunk group(s) entry2",
+  '',
+  'WARNING in chunk styles [mini-css-extract-plugin]',
+  'Conflicting order. Following module has been added:',
+  ` * css ${cssLoaderPath}!./e4.css`,
+  'despite it was not able to fulfill desired ordering with these modules:',
+  ` * css ${cssLoaderPath}!./e3.css`,
+  "   - couldn't fulfill desired order of chunk group(s) entry3",
+  '   - while fulfilling desired order of chunk group(s) entry4',
+  '',
+  'WARNING in chunk styles [mini-css-extract-plugin]',
+  'Conflicting order. Following module has been added:',
+  ` * css ${cssLoaderPath}!./e2.css`,
+  'despite it was not able to fulfill desired ordering with these modules:',
+  ` * css ${cssLoaderPath}!./e3.css`,
+  "   - couldn't fulfill desired order of chunk group(s) entry3",
+  '   - while fulfilling desired order of chunk group(s) entry4',
+].join('\n');

test/cases/ignoreOrderFalseWithoutGoodChunks/webpack.config.js

@@ -0,0 +1,35 @@
+import Self from '../../../src';
+
+module.exports = {
+  entry: {
+    entry1: './index.js',
+    entry2: './index2.js',
+    entry3: './index3.js',
+    entry4: './index4.js',
+  },
+  module: {
+    rules: [
+      {
+        test: /\.css$/,
+        use: [Self.loader, 'css-loader'],
+      },
+    ],
+  },
+  optimization: {
+    splitChunks: {
+      cacheGroups: {
+        styles: {
+          name: 'styles',
+          chunks: 'all',
+          test: /\.css$/,
+          enforce: true,
+        },
+      },
+    },
+  },
+  plugins: [
+    new Self({
+      ignoreOrder: false,
+    }),
+  ],
+};