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bundling multiple js files

in react using webpack every js files is bundle into a single bundle.js , for my normal html , css, js application for example , i am having 6 libraries. for an example consider
i am using jquery and bootstrap min versions. so if i reference two files the request will be two. so how can i make it into a single file. So there will be a single request.
like when i checked the file size is about in kb's and the request is processed within less that 1 or 2 seconds , like the chrome dev tools shows the time for to load also it parrallely loads the two files.
But how can i bundle the two librarys using webpack and get a single file that i can refer in my application.
i am a beginner to webpack

You need to import them in your entry point file and Webpack will handle the bundling. As you have worked with React, I assume you have basic command line skills.
You can read the Getting Started guide which bundles Lodash like how you are trying to bundle jQuery and Bootstrap.
First of install, ensure that you are installing jQuery, Bootstrap, and any other libraries using npm (or yarn, if you prefer):
# Install Webpack as a dev dependency
npm install webpack webpack-cli --save-dev
# Install dependencies (I've added Popper.js as Bootstrap requires it)
npm install jquery bootstrap popper.js
Create a folder called src and a file inside there called index.js. This is your entry point and Webpack will look for this file unless configured differently. Import the libraries like this:
import $ from 'jquery'
import 'bootstrap'
// Do something with jQuery
$(document).ready(() => console.log('Hello world!'))
Then run Webpack using npx:
npx webpack
A file named main.js should be created in a folder called dist that contains the bundled code. This is your output file. You can use a <script> tag in your HTML file to load this JavaScript:
<!-- assuming your index.html is in the dist folder -->
<script src='main.js'></script>
Once you get here, you can explore more advanced things like importing Bootstrap components individually, minifying code, multiple bundles, transpiling TypeScript, etc.
You will likely need to add a Webpack configuration file very soon as there is only so much that can be done using zero-config mode.

Good practice is to keep two sepearate bundles for the application logic and external libraries and in webpack this can be achieved by the following code,
app.js - appliation index file,
vendors.js - import all external libraries in this file
entry: {
app: './src/app.js',
vendors: './src/vendors.js'
}
To get a single file, import vendors.js file inside app.js file and give entry key in webpack as
entry: './src/app.js'

Let us assume that you have the files in src directory. You can merge multiple files by specifying them in webpack.config.js to have a single named file as an output. I hope this is what you are looking for.
const path = require('path');
module.exports = {
entry: {
'bundle.js': [
path.resolve(__dirname, 'src/file1.js'),
path.resolve(__dirname, 'src/file2.js')
]
},
output: {
filename: 'bundle.js',
path: path.resolve(__dirname, 'dist'),
},
module: {
rules: [{
exclude: /node_modules/
}]
}
};
As above, the two files "file1.js" and "file2.js" will be combined into a single file "bundle.js" and stored in "dist" directory.
You can also exclude node_modules by specifying a rule in module object of webpack configuration.

Webpack Exclude folder

I'm shoving a rather large app through Webpack, which pulls from two library folders: thirdparty and node_modules. I've setup my rule for js files as such:
{
test: /\.js$/,
loader: 'babel-loader',
include: [
/src\/js\/client/
],
exclude: [
/node_modules/,
/thirdparty/
]
}
My hope was that webpack wouldn't parse any folders under either of those two directories, but I'm getting errors for libraries that are. For instance:
WARNING in ./~/durandal/js/system.js
51:8-15 Critical dependency: require function is used in a way in which dependencies cannot be statically extracted
WARNING in ./~/durandal/js/system.js
52:8-15 Critical dependency: require function is used in a way in which dependencies cannot be statically extracted
ERROR in ./~/durandal/js/system.js
Cannot statically analyse 'require(..., ...)' in line 278
# ./src/js/client/lib/durandal/overrides/views.js 2:0-37
# ./src/js/client/index.js
Am I misunderstanding the functionality of include/exclude, or is this a bug with Webpack?

The rules do not decide which files are being parsed by webpack, but instead they are only applied to the files which are included and also satisfy the condition. Even if you had no rule at all, webpack would still parse the same files since you imported them somewhere.
You can exclude modules from being bundled with the externals option. These externals will have to be present at runtime in some way (for example loaded in a <script> tag).
If you just want webpack not to parse the files, but still include them, you can configure module.noParse. But as the documentation says, they should not contain any imports.

Define css files within webpack.config.js

I am building something like a static website generator that uses webpack to build the project and create a bundle with it.
In this project, a user is able to specify custom css files. I want those css files to be bundled with the final result. The issue is, that I do not have the paths to those css files available during development, so I can't do import 'some-asset-file-provided-by-the-user.css' in the javascript code that is going to be bundled. But I have them available when calling webpack.compile(config).
I am looking for a way to inject those css files into the bundle. So far I tried various ways, such as:
const stylesheet = 'some-asset-file-provided-by-the-user.css'
require(stylesheet)
Which did not work, probably because webpack is not able to deal with this "dynamic" require. Then I used the webpack define plugin for this
/* webpack.config.js */
new webpack.DefinePlugin({
stylesheet: 'some-asset-file-provided-by-the-user.css'
}),
/* app.js */
require(stylesheet) // should be replaced by the webpack define plugin with 'some-asset-file-provided-by-the-user.css'
which also did not work. I also tried to find a way to do something like this:
{
test: /\.css$/,
loader: ExtractTextPlugin.extract(Object.assign({
fallback: 'style-loader',
use: [
{
loader: 'css-loader',
options: {
useFiles: ['file-a.css', 'file-b.css']
}
}
]
}, extractTextPluginOptions))
// Note: this won't work without `new ExtractTextPlugin()` in `plugins`.
},
which also failed because apparently neither style-loader nor css-loader support this type of interaction.
How can I solve this? I am open to writing a plugin for this, but I'd rather use something existing.

The simplest way to include the CSS is by adding it to your entry point. To make this easier, you should use an array as entry point even if it's just a single file, so you can simply push the CSS.
For example:
entry: {
app: ['./src/index.js'],
// Other entries
},
In your compile script you add it to entry.app before passing it to webpack.
config.entry.app.push('./user.css');
const compiler = webpack(config);

Load requirejs module's css dependency with webpack

I am using webpack and I need to include some libraries built for requirejs.
Everything worked fine until one of the library declared a css dependency:
define(["css!./stylesheet.css"], function(){ \* module *\ });
Webpack has a css loader too, however it does not load them automatically as requirejs's one does. One must pipe the css loader to the style loader to do so:
require("style!css!./stylesheet.css");
Is there any way to make the prior working? For example, can I overwrite the css loader for this particular library so that it is piped with the style loader ?

I found a nice solution using postLoaders.
Adding
postLoaders: [
{ test: /\.css$/, loader: 'style', include: path.join(__dirname, "pathTo/theLib") }
]
into the module property of the webpack config did the trick.

Importing CSS files in Isomorphic React Components

I have a React application with Components written in ES6 - transpiled via Babel and Webpack.
In some places I would like to include specific CSS files with specific Components, as suggested in react webpack cookbook
However, if in any Component file I require a static CSS asset, eg:
import '../assets/css/style.css';
Then the compilation fails with an error:
SyntaxError: <PROJECT>/assets/css/style.css: Unexpected character '#' (3:0)
at Parser.pp.raise (<PROJECT>\node_modules\babel-core\lib\acorn\src\location.js:73:13)
at Parser.pp.getTokenFromCode (<PROJECT>\node_modules\babel-core\lib\acorn\src\tokenize.js:423:8)
at Parser.pp.readToken (<PROJECT>\node_modules\babel-core\lib\acorn\src\tokenize.js:106:15)
at Parser.<anonymous> (<PROJECT>\node_modules\babel-core\node_modules\acorn-jsx\inject.js:650:22)
at Parser.readToken (<PROJECT>\node_modules\babel-core\lib\acorn\plugins\flow.js:694:22)
at Parser.pp.nextToken (<PROJECT>\node_modules\babel-core\lib\acorn\src\tokenize.js:98:71)
at Object.parse (<PROJECT>\node_modules\babel-core\lib\acorn\src\index.js:105:5)
at exports.default (<PROJECT>\node_modules\babel-core\lib\babel\helpers\parse.js:47:19)
at File.parse (<PROJECT>\node_modules\babel-core\lib\babel\transformation\file\index.js:529:46)
at File.addCode (<PROJECT>\node_modules\babel-core\lib\babel\transformation\file\index.js:611:24)
It seems that if I try and require a CSS file in a Component file, then the Babel loader will interpret that as another source and try to transpile the CSS into Javascript.
Is this expected? Is there a way to achieve this - allowing transpiled files to explicitly reference static assets that are not to be transpiled?
I have specified loaders for both .js/jsx and CSS assets as follows:
module: {
loaders: [
{ test: /\.css$/, loader: "style-loader!css-loader" },
{ test: /\.(js|jsx)$/, exclude: /node_modules/, loader: 'babel'}
]
}
View the full webpack config file
FULL DETAILS BELOW:
webpack.common.js - A base webpack config I use, so I can share properties between dev and production.
Gruntfile.js - Gruntfile used for development. As you can see it requires the webpack config above and adds some development properties to it. Could this be causing the problem?
Html.jsx - My HTML jsx component that tries to import/require the CSS. This is an isomorphic app (using Fluxbile), hence needing to have the actual HTML as a rendered component. Using the require statement seen in this file, in any part of my application, gives the error described.
It seems to be something to do with grunt. If I just compile with webpack --config webpack.common.js then I get no errors.
Short answer: It's a node runtime error. Trying to load CSS on the server in isomorphic apps is not a good idea.

You can't require css in the component that you are rendering on the server. One way to deal with it is to check if it's a browser before requiring css.
if (process.env.BROWSER) {
require("./style.css");
}
In order to make it possible you should set process.env.BROWSER to false (or delete it) on the server
server.js
delete process.env.BROWSER;
...
// other server stuff
and set it to true for the browser. You do it with webpack's DefinePlugin in the config -
webpack.config.js
plugins: [
...
new webpack.DefinePlugin({
"process.env": {
BROWSER: JSON.stringify(true)
}
})
]
You can see this in action in gpbl's Isomorphic500 app.

If you're building an isomorphic app with ES6 and want to include CSS when rendering on the server (important so basic styles can be sent down to the client in the first HTTP response) check out the #withStyles ES7 decorator used in React Starter Kit.
This little beauty helps ensure users see your content with styles when the page is first rendered. Here's an example isomorphic app I'm building leveraging this technique. Just search the codebase for #withStyles to see how it's used. It goes a little something like this:
import React, { Component, PropTypes } from 'react';
import styles from './ScheduleList.css';
import withStyles from '../../decorators/withStyles';
#withStyles(styles)
class ScheduleList extends Component {

We had a similar problem with our isomorphic app (and a lot of other problems, you can find details here). As for the problem with CSS import, at first, we were using process.env.BROWSER. Later we've switched to babel-plugin-transform-require-ignore. It works perfectly with babel6.
All you need is to have the following section in your .babelrc
"env": {
"node": {
"plugins": [
[
"babel-plugin-transform-require-ignore", { "extensions": [".less", ".css"] }
]
]
}
}
After that run your app with BABEL_ENV='node'. Like that:
BABEL_ENV='node' node app.js.
Here is an example of how a production config can look like.

You can also try this
https://github.com/halt-hammerzeit/webpack-isomorphic-tools
or this
https://github.com/halt-hammerzeit/webpack-react-redux-isomorphic-render-example

I used this babel plugin with success to solve a similar issue with less, svg and images. But it should work with any non js assets.
It rewrites all assets imports into variables, so as long as you run the compiled code just on the server and have a bundle built with webpack for the client, it should be fine.
The only drawback is that it onlyworks with named imports, so you'll have to:
import styles from './styles.css';
in order to make it work.

Make sure you are using the loaders in your webpack config:
module: {
loaders: [
{ test: /\.jsx$/, exclude: /node_modules/, loader: "babel" },
{ test: /\.css$/, loader: "style!css" }
]
}

You probably have an error in your Webpack config where you're using the babel-loader for all files, and not just .js files. You want to use a css loader for .css files.
But you shouldn't use import for loading any other module than Javascript modules, because once imports are implemented in browsers, you will only be able to import Javascript files. Use require instead in cases where you need Webpack specific functionality.
ORIGINAL POST
Webpack uses require and Babel lets you use import from ES6 which mostly do the same thing (and Babel transpiles the import to a require statement), but they are not interchangable. Webpacks require function lets you specify more than just a module name, it lets you specify loaders as well, which you cannot do with ES6 imports. So if you want to load a CSS file, you should use require instead of import.
The reason is that Babel is just a transpiler for what's coming in ES6, and ES6 will not allow you to import CSS files. So Babel won't allow you to do that either.

I've finally realised that this error is not originating at the compile stage, but rather at runtime. Because this is an ismorphic app, the components and any dependencies they have will first be parsed on the server (ie, in node). It is this that is causing the error.
Thanks for all the suggestions, I will post more if/when I figure out how to have per-component stylesheets in an isomorphic application.

I also met the same problem when I want to do the server-side render.
So I write a postcss plugin, postcss-hash-classname.
You don't require css directly.
You require your css classname js file.
Because all you require is js file, you can do the server-side render as usual.
Besides, this plugin also use your classname and file path to generate unique hash to solve css scope problem.
You can try it!

Solved With This...
https://github.com/michalkvasnicak/babel-plugin-css-modules-transform
$ npm install --save-dev babel-plugin-css-modules-transform
Include plugin in .babelrc
{
"plugins": ["css-modules-transform"]
}
And Import Css..... Like This Anywhere You Want
const styles = require('./test.css');
OR
import css from './styles.css'
Also See This... Apart From Css Files........................................................ .
https://www.npmjs.com/package/babel-plugin-transform-assets