Introducing the new Firebase JS SDK

Firebase has released beta JavaScript SDK libraries designed to reduce web bundle sizes significantly, in some cases by up to 80%, without removing existing features. The redesign replaces namespace-based and side-effect imports with explicit modular imports and separate package entry points, allowing bundlers such as webpack and Rollup to tree-shake unused code. The change introduces a breaking API update, though a compatibility library permits gradual migration by supporting legacy-style and modular APIs together until developers can fully switch. The update also introduces Firestore Lite, a REST-based package for smaller create, read, update, and delete workloads that omits realtime streaming and advanced offline capabilities, potentially reducing Firestore size by 84% for one-time reads. Firebase/Auth may be up to 72% lighter under the new approach, while framework integrations including AngularFire, ReactFire, and RxFire are planned or nearing compatibility. The SDK is available through npm’s beta tag, with a future main release expected and upgrade documentation available.

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