Introduction to Webpack Configs

An Introduction to Webpack Configs

An Introduction to Webpack Configs

In this post, we will give you information about An Introduction to Webpack Configs. Here we will give you detail about An Introduction to Webpack Configs And how to use it also give you a demo for it if it is necessary.

Webpack configs allow you to configure and extend Webpack’s basic functionality. A Webpack config is a JavaScript object that configures one of Webpack’s options. Most projects define their Webpack config in a top-level webpack.config.js file, although you can also pass the config as a parameter to Webpack’s Node.js API.

To understand Webpack configs, you need to understand what Webpack does. Webpack is first and foremost a bundler. Webpack’s base functionality is to take a JavaScript file, resolve any dependencies (require(), import, etc.), and output a bundled JavaScript file that
contains all those dependencies. You can then run the bundled file without having to load those dependencies again.

Do You Even Need a Webpack Config?

For basic use cases like bundling a Vue app or a
Lambda function with Webpack,
you might not even need a Webpack config. By default, Webpack
bundles the src/index.js file and writes the output to the
dist/main.js file.

Suppose you have the below file in src/index.js – it’s a
“Hello, World” app using Vue.

const Vue = require('vue');

const app = new Vue({
  template: '<h1>Hello, World</h1>'


If you run npm install vue webpack webpack-cli, and run ./node_modules/.bin/webpack, you’ll see the below output:

$ ./node_modules/.bin/webpack
Hash: f19bd04db784f5de4438
Version: webpack 4.42.0
Time: 1152ms
Built at: 03/02/2020 10:18:13 AM
  Asset      Size  Chunks             Chunk Names
main.js  68.9 KiB       0  [emitted]  main
Entrypoint main = main.js
[0] (webpack)/buildin/global.js 472 bytes {0} [built]
[1] ./src/index.js 116 bytes {0} [built]
    + 4 hidden modules

WARNING in configuration
The 'mode' option has not been set, webpack will fallback to 'production' for this value. Set 'mode' option to 'development' or 'production' to enable defaults for each environment.
You can also set it to 'none' to disable any default behavior. Learn more:

Webpack generated a bundled main.js file that you can then load in the browser:

    <script src="dist/main.js"></script>
    <div id="content"></div>

So you can get the core benefits of Webpack with zero configuration.
For many apps Webpack’s zero config option is enough. But one place
where it starts to break down is if you have multiple files that
you want to bundle – say you have one GitHub repo with multiple
Lambda functions. Here’s how you handle multiple files with a Webpack config.

Multiple Files

This section will use 3 Webpack options. 2 are for specifying which
files to bundle:

  • entry: what files to bundle
  • output: where to put the bundled files

There’s one more option, the target option, which tells Webpack
whether you’re bundling for the browser ('web') or Node ('node').
For Vue apps you will typically use 'web', but for Lambda you
should use 'node'.

Below is a Webpack file using those 3 options that bundles 2
files from the src directory and outputs them to the dist

module.exports = {
  // You need to list out every file you want to bundle in 'entry'
  entry: {
    express: '${process.cwd()}/src/express.js',
    mongoose: '${process.cwd()}/src/mongoose.js'
  output: {
    // Write to the '/dist' directory relative to the directory
    // where 'webpack' is running
    path: '${process.cwd()}/dist',
    // Webpack will bundle 'src/foo.js' into 'dist/foo.min.js'
    // because of '[name]'.
    filename: '[name].min.js'
  target: 'node'

Note that Webpack configs are JavaScript files, not JSON or YAML(Introduction to Webpack Configs).

Here’s the contents of the express.js and mongoose.js files:

// express.js
const pkg = require('express/package');

console.log('Express version', pkg.version);
// mongoose.js
const mongoose = require('mongoose');

console.log('Mongoose version', mongoose.version);

Webpack bundles Express and Mongoose with each function, so you can still run express.min.js and mongoose.min.js even if
you rm -rf ./node_modules.

More Sophisticated Configs for Introduction to Webpack Configs

If Webpack configs are this simple, why do developers complain about Webpack being hard? Because Webpack is also a common entry point for transpilers – Babel, TypeScript, JSX, etc. If you don’t need to transpile (and odds are you don’t), Webpack is easy. But once you introduce transpilers, things can get tricky.

Here’s the official guide for using Webpack to compile TypeScript. This section will provide an abridged version.

The key part of webpack.config.js for transpilers is the module.rules option. This is where you tell Webpack to use a special loader to compile a file before bundling. For TypeScript, you need the ts-loader npm module, in addition to the typescript npm module.

npm install typescript ts-loader

The module.rules option is an array of rules. The below webpack.config.js tells Webpack to use the ts-loader module to compile any files that end in ‘.ts’.

module.exports = {
  entry: './src/index.ts',
  module: {
    // Use 'ts-loader' on any file that ends in '.ts'
    rules: [
        test: /.ts$/,
        use: 'ts-loader',
        exclude: /node_modules/,
  // Bundle '.ts' files as well as '.js' files.
  resolve: {
    extensions: ['.ts', '.js'],
  output: {
    filename: 'main.js',
    path: '${process.cwd()}/dist',

Below is the index.ts file:

const str: string = 'Hello, World';


You also need to add a tsconfig.json file, otherwise TypeScript will error out. For the purposes of this tutorial, the below tsconfig.json is enough:


Running ./node_modules/.bin/webpack should give you the below output:

$ ./node_modules/.bin/webpack
Hash: 63b83086be302b9d23c8
Version: webpack 4.42.0
Time: 1301ms
Built at: 03/02/2020 10:51:14 AM
  Asset       Size  Chunks             Chunk Names
main.js  957 bytes       0  [emitted]  main
Entrypoint main = main.js
[0] ./src/index.ts 44 bytes {0} [built]

WARNING in configuration
The 'mode' option has not been set, webpack will fallback to 'production' for this value. Set 'mode' option to 'development' or 'production' to enable defaults for each environment.
You can also set it to 'none' to disable any default behavior. Learn more:

And then you can finally run node ./dist/main.js!

More Webpack Tutorials

  • Defining Plugins with Webpack
  • How to Use Webpack’s url-loader
  • How to Use Webpack’s Module Aliasing
  • Using Webpack CSS Loader
  • Using Webpack to Compile TypeScript
  • Webpack Externals
  • Analyze JavaScript Bundles with Webpack Bundle Analyzer

Webpack is a module bundler. Its main purpose is to bundle JavaScript files

for usage in a browser, yet it is also capable of transforming, bundling, or packaging just about any resource or asset.

Webpack takes modules with dependencies and generates static assets representing those modules.

These assets can be served by a web server or loaded directly into a browser.

Webpack is a popular choice for bundling JavaScript applications because it is:

  • Fast: Webpack can bundle large applications quickly.
  • Flexible: Webpack can be configured to do a wide variety of tasks.
  • Extensible: Webpack has a large community of developers who have created plugins that extend its functionality.

If you are developing a JavaScript application, Webpack is a good choice for bundling your code. It is fast, flexible, and extensible.

Here are some of the things that Webpack can do for Introduction to Webpack Configs:

  • Bundle JavaScript files into a single file for faster loading.
  • Optimize JavaScript code for better performance.
  • Minify JavaScript code to reduce its size.
  • Transpile JavaScript code to make it compatible with older browsers.
  • Inject CSS styles into HTML files.
  • Bundle image files into a single file for faster loading.
  • Optimize image files for better performance.
  • Minify image files to reduce their size.

Webpack is a powerful tool that can help you build better JavaScript applications. If you are not familiar with Webpack, there are many resources available online to help you get started.

Here are some of the resources that I recommend for Introduction to Webpack Configs:

  • Webpack documentation: The official documentation for Webpack is a great place to start learning about the tool.
  • Webpack tutorials: There are many tutorials available online that can teach you how to use Webpack.
  • Webpack plugins: There are a large number of plugins available for Webpack that can extend its functionality.
  • Webpack community: The Webpack community is very active and helpful. If you have any questions, you can ask them on the Webpack forum or in the Webpack Slack channel.

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