Docs: Add Using bundlers to bundle CKEditor 5 document.

docs/getting-started/setup/using-bundlers.md

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+---
+category: setup
+meta-title: Using bundlers | CKEditor 5 documentation
+menu-title: Using bundlers
+order: 130
+modified_at: 2024-08-30
+---
+
+# Using bundlers to bundle the editor.
+
+This guide will show you how to configure popular bundlers like **Vite**, **esbuild**, **Rollup**, and **webpack** to build applications using CKEditor 5. Showing how to set up or use these bundlers is not the goal of this guide.
+
+Note that CKEditor 5 ships plain ES2022 JavaScript modules and CSS files. Therefore, with recent enough bundlers, you should be able to use CKEditor 5 without any additional configuration. Or – in the case of Rollup and webpack – only with a standard set of plugins.
+
+## Bundling CKEditor 5 with Vite
+
+There is no need for any special configuration to bundle CKEditor 5 with recent versions of Vite. Follow the {@link getting-started/quick-start#installing-ckeditor-5-using-npm npm installation guide} to learn more.
+
+## Bundling CKEditor 5 with esbuild
+
+Similarly, you need no special configuration to bundle CKEditor 5 with recent versions of esbuild. Follow the {@link getting-started/quick-start#installing-ckeditor-5-using-npm npm installation guide} to learn more.
+
+## Bundling CKEditor 5 with Rollup
+
+To bundle CKEditor 5 with Rollup, you need to install the following plugins:
+
+1. `@rollup/plugin-commonjs` – to convert CommonJS modules to ES6.
+2. `@rollup/plugin-node-resolve` – to allow Rollup to resolve dependencies.
+3. `@rollup/plugin-json` – to allow Rollup to handle JSON files.
+4. `rollup-plugin-import-css` or `rollup-plugin-styles` – to allow Rollup to handle CSS files.
+5. `@rollup/plugin-terser` – to minify the output.
+
+Here is an example `rollup.config.js` file:
+
+```js
+// rollup.config.js
+import { defineConfig } from 'rollup';
+import commonjs from '@rollup/plugin-commonjs';
+import { nodeResolve } from '@rollup/plugin-node-resolve';
+import json from '@rollup/plugin-json';
+import css from 'rollup-plugin-import-css';
+import terser from '@rollup/plugin-terser';
+
+const sourceMap = true; // Change depending on your needs.
+const minify = true; // Change depending on your needs.
+
+export default defineConfig( {
+	// Other options are omitted for better readability.
+	plugins: [
+		commonjs( {
+			sourceMap,
+			defaultIsModuleExports: true
+		} ),
+		nodeResolve( {
+			browser: true,
+			preferBuiltins: false
+		} ),
+		json(),
+		css( {
+			minify
+		} ),
+		minify && terser( {
+			sourceMap
+		} )
+	]
+} );
+```
+
+## Bundling CKEditor 5 with webpack
+
+To bundle CKEditor 5 with webpack, you need to install the following plugins:
+
+1. `mini-css-extract-plugin` – to extract CSS to a separate file.
+2. `css-minimizer-webpack-plugin` – to minify CSS.
+3. `terser-webpack-plugin` – to minify JavaScript.
+
+Here is an example `webpack.config.js` file:
+
+```js
+// webpack.config.js
+const path = require( 'path' );
+const TerserPlugin = require( 'terser-webpack-plugin' );
+const CssMinimizerPlugin = require( 'css-minimizer-webpack-plugin' );
+const MiniCssExtractPlugin = require( 'mini-css-extract-plugin' );
+
+const sourceMap = true; // Change depending on your needs.
+const minify = true; // Change depending on your needs.
+
+module.exports = {
+	// Other options are omitted for better readability.
+	optimization: {
+		minimize: minify,
+		minimizer: [
+			new TerserPlugin(),
+			new CssMinimizerPlugin()
+		]
+	},
+	plugins: [
+		new MiniCssExtractPlugin()
+	],
+	module: {
+		rules: [
+			{
+				test: /\.css$/i,
+				use: [
+					MiniCssExtractPlugin.loader,
+					'css-loader'
+				]
+			}
+		]
+	}
+};
+```
+
+Some setups and meta-frameworks based on webpack (such as Next.js), may use a `babel-loader` to transpile JavaScript to a lower version. If the version of `babel-loader`, `@babel/core`, and `@babel/preset-env` are recent enough, you should be able to use CKEditor 5 without any additional configuration. However, projects using older versions of these packages may encounter the `Module parse failed: Unexpected token` error. It is caused by some ES2022 features that CKEditor 5 uses, such as native class properties. You need to add the [`@babel/plugin-proposal-class-properties`](https://babeljs.io/docs/babel-plugin-transform-class-properties) plugin to your Babel configuration to address this issue.
+
+However, to avoid similar issues when CKEditor 5 starts using other modern features in the future, we recommend updating `babel-loader`, `@babel/core`, and `@babel/preset-env` to the latest possible versions.