Tree shaking

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Tree shaking is a term used to describe the removal of unused code (known as dead code) written in JavaScript.

It relies on the import and export statements in ES6 to detect if code modules are exported and imported for use between JavaScript files. 

In modern JavaScript applications, we use module bundlers (e.g., webpack or Rollup) to automatically remove dead code when bundling multiple JavaScript files into single files. This is important for preparing code that is production ready, for example with clean structures and minimal file size. 

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