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Bundler tree-shaking (and when it lies)

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DEFINITION

A bundler (esbuild, Rollup, Webpack, Turbopack) statically drops unused exports. It works when modules are ESM, exports are unreferenced, and side-effect annotations are correct (`sideEffects: false` in package.json). It lies when you consume CJS, use dynamic `require` / `import`, or the library leans on `import './polyfill'` patterns. Most 'I expected this bundle to be smaller' moments are this · inspect with `webpack-bundle-analyzer` or `source-map-explorer`.

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