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of 49Explain the core concepts of Webpack
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Webpack has four core concepts:
- Entry: The starting point where Webpack begins building the dependency graph
- Output: Where and how to emit the bundles
- Loaders: Transform files from different languages/formats into modules
- Plugins: Extend Webpack's functionality for optimization, asset management, etc.
module.exports = {
entry: './src/index.js',
output: {
path: path.resolve(__dirname, 'dist'),
filename: 'bundle.js'
},
module: {
rules: [{ test: /\.js$/, use: 'babel-loader' }]
},
plugins: [new HtmlWebpackPlugin()]
};
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Explain the basic structure of a Webpack configuration file
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A basic webpack.config.js structure:
const path = require('path');
module.exports = {
mode: 'development', // or 'production'
entry: './src/index.js',
output: {
path: path.resolve(__dirname, 'dist'),
filename: 'bundle.js'
},
module: {
rules: [
// Loader configurations
]
},
plugins: [
// Plugin instances
],
resolve: {
// Module resolution options
},
devServer: {
// Dev server configuration
}
};
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What are loaders and how do they work?
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Loaders transform files from different languages or formats into modules that Webpack can understand. They run during the build process and transform files on a per-file basis.
module.exports = {
module: {
rules: [
{
test: /\.css$/,
use: ['style-loader', 'css-loader']
},
{
test: /\.js$/,
exclude: /node_modules/,
use: {
loader: 'babel-loader',
options: {
presets: ['@babel/preset-env']
}
}
}
]
}
};
Loaders are processed right-to-left (or bottom-to-top) in the use array.
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Explain the difference between style-loader and css-loader
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css-loader:
- Interprets
@importandurl()likeimport/require() - Resolves CSS dependencies and returns CSS as a string
style-loader:
- Injects CSS into the DOM by adding
<style>tags - Usually used after css-loader in the chain
// This processes CSS files and injects them into the DOM
{
test: /\.css$/,
use: ['style-loader', 'css-loader']
}
For production, you might use MiniCssExtractPlugin.loader instead of style-loader to extract CSS into separate files.
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What are plugins and how do they differ from loaders?
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Plugins:
- Perform actions on the entire bundle or compilation
- Can modify the build process, add files, or optimize output
- Work at the bundle level
Loaders:
- Transform individual files during the build process
- Work at the file level
- Process files before they're added to the bundle
const HtmlWebpackPlugin = require('html-webpack-plugin');
module.exports = {
plugins: [
new HtmlWebpackPlugin({
template: './src/index.html'
})
]
};
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What is HtmlWebpackPlugin and why is it useful?
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HtmlWebpackPlugin automatically generates HTML files that include your Webpack bundles. It's useful because:
- Automatic injection: Automatically adds script and link tags for your bundles
- Template support: Can use HTML templates with variables
- Multiple pages: Can generate multiple HTML files
- Cache busting: Works with filename hashing for cache invalidation
new HtmlWebpackPlugin({
template: './src/index.html',
filename: 'index.html',
chunks: ['app'], // Only include specific chunks
minify: process.env.NODE_ENV === 'production'
})
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How do you configure webpack-dev-server?
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module.exports = {
devServer: {
static: './dist',
port: 3000,
open: true,
hot: true,
compress: true,
historyApiFallback: true, // For SPA routing
proxy: {
'/api': {
target: 'http://localhost:8080',
changeOrigin: true
}
}
}
};
Key options:
static: Serve static files from directoryhot: Enable HMRproxy: Proxy API requests to another serverhistoryApiFallback: Handle client-side routing
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What is the difference between Webpack and other bundlers like Rollup or Parcel?
How does Webpack's dependency graph work?
What are multiple entry points and when would you use them?
How do you configure different environments (development vs production)?
How do you handle different file types (images, fonts, etc.) in Webpack?
What is the purpose of babel-loader and how do you configure it?
Explain some commonly used Webpack plugins
How do you extract CSS into separate files?
What is code splitting and why is it important?
How do you implement dynamic imports for code splitting?
What is tree shaking and how does it work in Webpack?
What is Hot Module Replacement (HMR) and how does it work?
What are source maps and how do you configure them?
How do you handle environment variables in Webpack?
What are externals in Webpack and when do you use them?
What is the difference between chunk and bundle in Webpack?
How do you handle assets and public paths in Webpack?
How do you integrate Webpack with TypeScript?
How does persistent caching work in Webpack 5?
What are Asset Modules in Webpack 5?
How do you configure top-level await in Webpack 5?
What is the real content hash feature in Webpack 5?
How do you use Web Workers with Webpack 5?
How do you implement Webpack Bundle Analysis in Webpack 5?
Explain the SplitChunksPlugin and its configuration
How do you optimize bundle size in Webpack?
What is module federation in Webpack 5?
How does module resolution work in Webpack?
How do you create a custom Webpack loader?
How do you create a custom Webpack plugin?
How do you analyze and debug Webpack bundle performance?
What are some common Webpack performance optimization techniques?
What is Webpack's persistent caching and how do you use it?
How do you configure Webpack for different deployment environments?
What are some common Webpack errors and how do you debug them?
What is the purpose of the optimization property in Webpack configuration?
What is Module Federation in Webpack 5 and how do you use it?
What are Webpack 5's tree shaking improvements?
How do you configure Webpack 5 for microfrontends with shared dependencies?
What are Webpack 5's new JavaScript API improvements?
How do you implement advanced code splitting strategies in Webpack 5?
How do you debug and troubleshoot Webpack 5 builds effectively?
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Webpack cheatsheet
Webpack Interview Cheat Sheet
- Summary01
- Core Concepts02
- 📦 Basic Configuration03
- Loaders04
- Plugins05
- Optimization06
- Development Features07
- Performance Optimization08
- Environment Variables09
- Module Federation10
- Key Interview Concepts11
- Best Practices12
- + 6 more inside
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