fix: bloated runtime

Author: alexander-akait

src/index.js

@@ -477,10 +477,15 @@ class MiniCssExtractPlugin {
               MODULE_TYPE,
               'mini-css',
               `${webpack.RuntimeGlobals.require}.miniCssF`,
-              (referencedChunk) =>
-                referencedChunk.canBeInitial()
+              (referencedChunk) => {
+                if (!referencedChunk.contentHash[MODULE_TYPE]) {
+                  return '';
+                }
+
+                return referencedChunk.canBeInitial()
                   ? this.options.filename
-                  : this.options.chunkFilename,
+                  : this.options.chunkFilename;
+              },
               true
             )
           );

test/cases/runtime/expected/webpack-5/runtime~main.js

@@ -101,7 +101,7 @@
 /******/ 		// This function allow to reference all chunks
 /******/ 		__webpack_require__.miniCssF = (chunkId) => {
 /******/ 			// return url for filenames based on template
-/******/ 			return "" + ({"0":"main","1":"runtime~main"}[chunkId] || chunkId) + "." + {"0":"a7263f8f763dcf4051bc"}[chunkId] + ".css";
+/******/ 			return "" + "main" + "." + "a7263f8f763dcf4051bc" + ".css";
 /******/ 		};
 /******/ 	})();
 /******/