How to Optimize NPM Package Bundles: Tree‑Shaking, Babel, and Side‑Effects Explained

This article analyzes the challenges of packaging JavaScript libraries for npm, compares CommonJS, UMD, and ESModule outputs, demonstrates how Webpack’s tree‑shaking and sideEffects settings affect bundle size, and provides practical Babel configuration tips to achieve lean, reusable packages.

Tree Shakingbabelbundle

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How to Optimize NPM Package Bundles: Tree‑Shaking, Babel, and Side‑Effects Explained

Meituan Technology Team

Nov 3, 2015 · Mobile Development

Understanding Cold and Hot Signals in ReactiveCocoa (RAC)

Understanding ReactiveCocoa’s cold and hot signals reveals that each subscription to a cold fetchData signal triggers a separate network request, causing duplicated calls, while converting the signal to hot with shareReplay or publish ensures a single request is shared across UI bindings and error handling.

ColdSignalHotSignalObjective‑C

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Understanding Cold and Hot Signals in ReactiveCocoa (RAC)