Add Global CSS test

src/__tests__/__apps__/_shared-ui/styles/global.css

@@ -0,0 +1,4 @@
+body {
+  background-color: black;
+  color: white;
+}

src/__tests__/__apps__/basic/pages/_app.jsx

@@ -0,0 +1,5 @@
+import 'shared-ui/styles/global.css';
+
+export default function MyApp({ Component, pageProps }) {
+  return <Component {...pageProps} />;
+}

src/next-transpile-modules.js

@@ -82,7 +82,7 @@ const withTm = (transpileModules = []) => (nextConfig = {}) => {
         include: includes
       });
 
-      // Support CSS modules in node_modules
+      // Support CSS modules + global in node_modules
       // TODO ask Next.js maintainer to expose the css-loader via defaultLoaders
       const nextCssLoaders = config.module.rules.find((rule) => typeof rule.oneOf === 'object');
 
@@ -107,8 +107,6 @@ const withTm = (transpileModules = []) => (nextConfig = {}) => {
         }
       }
 
-      // .css (global CSS)
-
       // Overload the Webpack config if it was already overloaded
       if (typeof nextConfig.webpack === 'function') {
         return nextConfig.webpack(config, options);