How to Add Dependency In Webpack?

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To add dependencies in webpack, you need to install them using npm or yarn. Once the dependencies are installed, you can import them in your JavaScript files using import or require statements.


To make webpack aware of the dependencies, you need to configure the module rules in your webpack configuration file. Define the rules for the specific file types that you want webpack to process and include the necessary loaders or plugins for handling those dependencies.


You can also use the webpack command line interface to add dependencies by specifying the module name and version in the command. This will automatically install the dependency and update your package.json file.


Overall, adding dependencies in webpack involves installing them, importing them in your code, and configuring webpack to process and bundle them correctly.

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How to specify dependencies in webpack bundle?

Dependencies in a webpack bundle can be specified in the webpack configuration file (usually named webpack.config.js) using the "externals" property.


For example, to specify that a dependency should be loaded externally, rather than bundled into the webpack output, you can configure the "externals" property like this:

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module.exports = {
  // other webpack configuration options
  
  externals: {
    lodash: 'lodash', // tells webpack to load lodash as an external dependency
    react: 'React', // tells webpack to load React as an external dependency
  }
};


In this example, when webpack encounters imports for lodash or react, it will not bundle these dependencies into the output, but instead expect them to be available in the global scope (e.g. from a CDN or script tag).


You can also specify dependencies that are available as CommonJS modules by providing a function that returns the name of the global variable that the module is available as:

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module.exports = {
  // other webpack configuration options
  
  externals: {
    lodash: {
      commonjs: 'lodash',
      root: '_'
    },
    react: {
      commonjs: 'react',
      root: 'React'
    }
  }
};


In this example, webpack will look for the commonjs module "lodash" and use the global variable "_" when it's available.


By specifying dependencies in the "externals" property of the webpack configuration file, you can control how webpack bundles your project and manage external dependencies more efficiently.


How to exclude certain dependencies from a webpack bundle?

To exclude certain dependencies from a webpack bundle, you can use the externals configuration option in your webpack configuration file.


Here's an example of how you can exclude lodash from being bundled:

  1. Install lodash as a separate dependency:
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npm install lodash --save


  1. In your webpack configuration file, add the following code:
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module.exports = {
  // Other webpack configuration options...
  
  externals: {
    lodash: '_',
  },
};


In this example, we are telling webpack not to bundle lodash and to instead use the global variable _ for the lodash module. This way, lodash will not be included in the webpack bundle and will need to be provided externally for the application to work properly.


You can use a similar approach to exclude other dependencies from being bundled by specifying their global variables in the externals configuration option.


What is a webpack loader and how to use it for handling dependencies?

A webpack loader is a module that is used to preprocess files before they are added to the bundle. Loaders allow you to handle different types of files in your project, such as CSS, HTML, JavaScript, and more.


To use a webpack loader for handling dependencies, you need to first install the loader you want to use in your project using npm. For example, if you want to use the css-loader to handle CSS dependencies, you can install it with the following command:

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npm install css-loader --save-dev


Once the loader is installed, you can configure it in your webpack configuration file (usually named webpack.config.js). In the configuration file, you can specify the loader to use for certain file types in the module.rules array. For example, to use the css-loader for handling CSS files, you can add the following rule:

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module.exports = {
  module: {
    rules: [
      {
        test: /\.css$/,
        use: ['css-loader']
      }
    ]
  }
}


This configuration tells webpack to use the css-loader for any files that end with .css. You can add more loaders and rules to handle different types of files in your project.


Once the loaders are configured, webpack will automatically process the files using the specified loaders before adding them to the bundle. This allows you to manage and handle dependencies in your project more efficiently.

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