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Learn ECMAScript

You're reading from   Learn ECMAScript Discover the latest ECMAScript features in order to write cleaner code and learn the fundamentals of JavaScript

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Product type Paperback
Published in Feb 2018
Publisher
ISBN-13 9781788620062
Length 298 pages
Edition 2nd Edition
Languages
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Authors (2):
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Narayan Prusty Narayan Prusty
Author Profile Icon Narayan Prusty
Narayan Prusty
MEHUL MOHAN MEHUL MOHAN
Author Profile Icon MEHUL MOHAN
MEHUL MOHAN
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Toc

Table of Contents (14) Chapters Close

Preface 1. Getting Started with ECMAScript FREE CHAPTER 2. Knowing Your Library 3. Using Iterators 4. Asynchronous Programming 5. Modular Programming 6. Implementing the Reflect API 7. Proxies 8. Classes 9. JavaScript on the Web 10. Storage APIs in JavaScript 11. Web and Service Workers 12. Shared Memory and Atomics 13. Other Books You May Enjoy

Tree shaking

Tree shaking is basically a term used by module bundlers such as WebPack and Rollup to convey that the import-export module syntax can be used for dead-code elimination.

Essentially, the new module loader system enables these module bundlers to do something known as tree shaking, where they shake the tree to get rid of the dead leaves.

Your JavaScript is a tree. The modules you import represent the living leaves of your tree. The dead (unused) code is represented by the brown, dead leaves of the tree. To remove dead leaves, the bundler has to shake the tree and let them fall. 

How tree shaking is performed

Tree shaking, used by a module bundler, eliminates unused code in the following manner:

  1. Firstly, the...
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