February 2018
Intermediate to advanced
298 pages
8h 22m
English
Content preview from Learn ECMAScript - Second Edition
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How tree shaking is performed
Tree shaking, used by a module bundler, eliminates unused code in the following manner:
- Firstly, the bundler will combine all of the imported module files (like a good bundler). Here, exports that are not imported in any file are not exported at all.
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After that, the bundler minifies the bundle and simultaneously removes dead code. Thus, variables/functions that are not exported or used inside their respective module files are not present in the compressed bundle file. This way, tree shaking is performed.
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