feat: app-css-loader & suppress env warning in ng projects

packages/webpack5/src/loaders/app-css-loader/index.ts

@@ -0,0 +1,25 @@
+import { dedent } from 'ts-dedent';
+
+/**
+ * This loader tries to load an `app.scss` or and `app.css` relative to the main entry
+ */
+export default function loader(content: string, map: any) {
+	const callback = this.async();
+	const resolve = this.getResolve({
+		extensions: ['.scss', '.css'],
+	});
+
+	resolve(this.context, './app', (err, res) => {
+		if (err || !res) {
+			return callback(null, content, map);
+		}
+
+		const code = dedent`
+			// Added by app-css-loader
+			import "${res}";
+			${content}
+		`;
+
+		callback(null, code, map);
+	});
+}