refactor: improve css2json and apply-css loaders

optimize vendor chunks

packages/webpack5/src/configuration/base.ts

@@ -8,12 +8,11 @@ import {
 	getPlatform,
 } from '../helpers/project';
 
-import TransformNativeClass from '../transformers/NativeClass';
-
 import { CleanWebpackPlugin } from 'clean-webpack-plugin';
 import { DefinePlugin } from 'webpack';
 import { WatchStateLoggerPlugin } from '../plugins/WatchStateLoggerPlugin';
 import TerserPlugin from 'terser-webpack-plugin';
+import { BundleAnalyzerPlugin } from 'webpack-bundle-analyzer';
 
 export default function (config: Config, env: IWebpackEnv): Config {
 	const entryPath = getEntryPath();
@@ -56,6 +55,22 @@ export default function (config: Config, env: IWebpackEnv): Config {
 		},
 	]);
 
+	config.optimization.splitChunks({
+		cacheGroups: {
+			defaultVendor: {
+				test: /[\\/]node_modules[\\/]/,
+				priority: -10,
+				name: 'vendor',
+				chunks: 'all',
+				// test: (module) => {
+				// 	const moduleName = module.nameForCondition ? module.nameForCondition() : '';
+				// 	return /[\\/]node_modules[\\/]/.test(moduleName);
+				// },
+				// enforce: true
+			},
+		},
+	});
+
 	// look for loaders in
 	//  - node_modules/@nativescript/webpack/dist/loaders
 	//  - node_modules
@@ -107,7 +122,7 @@ export default function (config: Config, env: IWebpackEnv): Config {
 			},
 			getCustomTransformers() {
 				return {
-					before: [TransformNativeClass],
+					before: [require('../transformers/NativeClass')],
 				};
 			},
 		});
@@ -127,8 +142,8 @@ export default function (config: Config, env: IWebpackEnv): Config {
 		.use('apply-css-loader')
 		.loader('apply-css-loader')
 		.end()
-		.use('css-loader')
-		.loader('css-loader');
+		.use('css2json-loader')
+		.loader('css2json-loader');
 
 	// set up scss
 	config.module
@@ -168,6 +183,8 @@ export default function (config: Config, env: IWebpackEnv): Config {
 	// 	},
 	// ]);
 
+	config.plugin('BundleAnalyzerPlugin').use(BundleAnalyzerPlugin);
+
 	// add the WatchStateLogger plugin used to notify the CLI of build state
 	config.plugin('WatchStateLoggerPlugin').use(WatchStateLoggerPlugin);
 

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

@@ -1,35 +1,34 @@
 import { dedent } from 'ts-dedent';
 
 const cssLoaderWarning = dedent`
-	The apply-css-loader requires the file to be pre-processed by css-loader.
-	Make sure css-loader is applied before apply-css-loader.
+	The apply-css-loader requires the file to be pre-processed by either css-loader or css2json-loader.
+	Make sure the appropriate loader is applied before apply-css-loader.
 `;
 
-function hasCssLoader(loaders: any[], loaderIndex: number) {
-	return loaders
-		?.slice(loaderIndex)
-		.some(({ path }) => path.includes('css-loader'));
-}
-
 export default function loader(content, map) {
-	// if (this.request.match(/\/app\.(css|scss|less|sass)$/)) {
-	// 	return content;
-	// }
+	const hasLoader = (loader: string) => {
+		return this.loaders
+			?.slice(this.loaderIndex)
+			.some(({ path }) => path.includes(loader));
+	};
 
-	// Emit a warning if the file was not processed by the css-loader.
-	if (!hasCssLoader(this.loaders, this.loaderIndex)) {
-		this.emitWarning(new Error(cssLoaderWarning));
-	}
-
-	content = dedent`
-		/* CSS START */
+	if (hasLoader('apply-css-loader')) {
+		// add a tag to the applied css
+		const tag =
+			this.mode === 'development'
+				? `, ${JSON.stringify(this.resourcePath)}`
+				: '';
+		content = dedent`
 		${content}
-		/* CSS END */
-
-		/* APPLY CSS */
+		const { addTaggedAdditionalCSS } = require("@nativescript/core/ui/styling/style-scope");
+		addTaggedAdditionalCSS(___CSS2JSON_LOADER_EXPORT___${tag})
+		`;
+	} else if (hasLoader('css-loader')) {
+		content = dedent`
+		${content}
+		// apply css
 		const { Application } = require("@nativescript/core");
 		require("@nativescript/core/ui/styling/style-scope");
-
 		if (___CSS_LOADER_EXPORT___ && typeof ___CSS_LOADER_EXPORT___.forEach === "function") {
 			___CSS_LOADER_EXPORT___.forEach(cssExport => {
 				if (cssExport.length > 1 && cssExport[1]) {
@@ -39,6 +38,9 @@ export default function loader(content, map) {
 			});
 		}
 	`;
+	} else {
+		this.emitWarning(new Error(cssLoaderWarning));
+	}
 
 	this.callback(null, content, map);
 }

packages/webpack5/src/loaders/css2json-loader/index.ts

@@ -1,5 +1,6 @@
 import { parse, Import, Stylesheet } from 'css';
 import { urlToRequest } from 'loader-utils';
+import { dedent } from 'ts-dedent';
 
 const betweenQuotesPattern = /('|")(.*?)\1/;
 const unpackUrlPattern = /url\(([^\)]+)\)/;
@@ -33,9 +34,17 @@ export default function loader(content: string, map: any) {
 
 	// map.mappings = map.mappings.replace(/;{2,}/, '')
 
+	const code = dedent`
+	/* CSS2JSON */
+	${dependencies.join('\n')}
+
+	const ___CSS2JSON_LOADER_EXPORT___ = ${str}
+
+	export default ___CSS2JSON_LOADER_EXPORT___
+	`;
 	this.callback(
 		null,
-		`${dependencies.join('\n')}module.exports = ${str};`,
+		code, //`${dependencies.join('\n')}module.exports = ${str};`,
 		null
 	);
 }