fix: prefetch and preload runtime generation (#1116)

Author: alexander-akait

src/index.js

@@ -1123,7 +1123,7 @@ class MiniCssExtractPlugin {
                 ])
               : "// no hmr",
             "",
-            withPrefetch && hasCssMatcher !== false
+            withPrefetch && withLoading && hasCssMatcher !== false
               ? `${
                   RuntimeGlobals.prefetchChunkHandlers
                 }.miniCss = ${runtimeTemplate.basicFunction("chunkId", [
@@ -1159,7 +1159,7 @@ class MiniCssExtractPlugin {
                 ])};`
               : "// no prefetching",
             "",
-            withPreload && hasCssMatcher !== false
+            withPreload && withLoading && hasCssMatcher !== false
               ? `${
                   RuntimeGlobals.preloadChunkHandlers
                 }.miniCss = ${runtimeTemplate.basicFunction("chunkId", [

test/cases/prefetch-preload-hmr/a.css

@@ -0,0 +1,3 @@
+.a {
+  color: red;
+}

test/cases/prefetch-preload-hmr/b.js

@@ -0,0 +1,4 @@
+.a {
+  color: red;
+}
+

test/cases/prefetch-preload-hmr/expected/main.css

@@ -0,0 +1,3 @@
+import "./a.css";
+
+import(/* webpackPrefetch: true */ "./b");

test/cases/prefetch-preload-hmr/index.js

@@ -0,0 +1,21 @@
+import webpack from "webpack";
+
+import Self from "../../../src";
+
+module.exports = {
+  entry: "./index.js",
+  module: {
+    rules: [
+      {
+        test: /\.css$/,
+        use: [Self.loader, "css-loader"],
+      },
+    ],
+  },
+  plugins: [
+    new Self({
+      filename: "[name].css",
+    }),
+    new webpack.HotModuleReplacementPlugin(),
+  ],
+};