Technical Definition
Tree shaking removes unused code from JavaScript bundles during build. Identifies and eliminates dead code that's never called. Requires ES modules (import/export syntax). Supported by webpack, Rollup, and modern bundlers. Results in smaller bundles and faster performance.
Simple Explanation (ELI13)
Tree shaking automatically removes code you don't actually use from your JavaScript files. If you import a library but only use one function, tree shaking removes the rest. It makes your files smaller without you having to manually clean them up.
Related Terms
JavaScript, Bundle Size, Performance, Build Tools
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