Does tree shaking work with CommonJS?

No, it works best with ES modules.

Tree Shaking in Web - Learn WEB-PERFORMANCE-OPTIMIZATION | Revochamp

Name: Tree Shaking in Web
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Author: Revochamp

What is Tree Shaking?

Tree shaking is a technique used to remove unused code from JavaScript bundles, reducing file size and improving performance.

Why Tree Shaking Matters

Large JavaScript bundles slow down websites. Tree shaking ensures only the necessary code is included, improving load speed and efficiency.

Basic Example

JavaScriptRead-only

// utils.js
export function add(a, b) { return a + b; }
export function multiply(a, b) { return a * b; }

// main.js
import { add } from './utils.js';
console.log(add(2, 3));

// utils.js
export function add(a, b) { return a + b; }
export function multiply(a, b) { return a * b; }

// main.js
import { add } from './utils.js';
console.log(add(2, 3));

How Tree Shaking Works

Uses ES Modules (import/export)
Removes unused exports
Works during build process (Webpack, Rollup)

Requirements for Tree Shaking

Use ES6 modules (import/export)
Use a bundler like Webpack or Rollup
Avoid side effects in modules

Benefits of Tree Shaking

Reduced bundle size
Faster load times
Improved performance
Efficient code delivery

Best Practices

Use ES module syntax
Avoid importing entire libraries
Use modular libraries (e.g., lodash-es)
Configure bundler properly

Common Mistakes

Using CommonJS instead of ES modules
Importing full libraries unnecessarily
Ignoring side effects in modules
Not configuring bundler for production

Conclusion

Tree shaking is a powerful optimization technique that removes unused code and improves web performance by reducing bundle size.

What is Tree Shaking?

Tree shaking is a technique used to remove unused code from JavaScript bundles, reducing file size and improving performance.

Why Tree Shaking Matters

Large JavaScript bundles slow down websites. Tree shaking ensures only the necessary code is included, improving load speed and efficiency.

Basic Example

JavaScriptRead-only

// utils.js
export function add(a, b) { return a + b; }
export function multiply(a, b) { return a * b; }

// main.js
import { add } from './utils.js';
console.log(add(2, 3));

// utils.js
export function add(a, b) { return a + b; }
export function multiply(a, b) { return a * b; }

// main.js
import { add } from './utils.js';
console.log(add(2, 3));

How Tree Shaking Works

Uses ES Modules (import/export)
Removes unused exports
Works during build process (Webpack, Rollup)

Requirements for Tree Shaking

Use ES6 modules (import/export)
Use a bundler like Webpack or Rollup
Avoid side effects in modules

Benefits of Tree Shaking

Reduced bundle size
Faster load times
Improved performance
Efficient code delivery

Best Practices

Use ES module syntax
Avoid importing entire libraries
Use modular libraries (e.g., lodash-es)
Configure bundler properly

Common Mistakes

Using CommonJS instead of ES modules
Importing full libraries unnecessarily
Ignoring side effects in modules
Not configuring bundler for production

Conclusion

Tree shaking is a powerful optimization technique that removes unused code and improves web performance by reducing bundle size.

Tree Shaking in Web

Tree Shaking in Web

What is Tree Shaking?

Why Tree Shaking Matters

Basic Example

How Tree Shaking Works

Requirements for Tree Shaking

Benefits of Tree Shaking

Best Practices

Common Mistakes

Conclusion

Try it yourself

Test Your Knowledge

Frequently Asked Questions

Need help?

Tree Shaking in Web

Tree Shaking in Web

What is Tree Shaking?

Why Tree Shaking Matters

Basic Example

How Tree Shaking Works

Requirements for Tree Shaking

Benefits of Tree Shaking

Best Practices

Common Mistakes

Conclusion

Try it yourself

Test Your Knowledge

Frequently Asked Questions

Need help?