Deep dive into the new Firebase JS SDK design
Blog post from Firebase
Firebase’s JavaScript SDK is transitioning from its long-standing namespace-based API to a modular design intended to reduce bundle sizes through tree shaking, while acknowledging that the change breaks patterns that have remained stable for roughly five years. Earlier versions relied on side-effect imports that augmented a shared `firebase` namespace, making services and their methods easy to discover but requiring bundlers to include potentially unused functionality. Version 9 instead exports individual functions, such as `initializeApp`, `getAuth`, and `onAuthStateChanged`, allowing bundlers to exclude unused code and making service creation and usage more explicit. To ease migration, Firebase provides a compatibility library that preserves the version 8 API while using version 9 internally, enabling old and new APIs to operate together during incremental upgrades. Once applications fully adopt modular imports, they can remove compatibility dependencies and receive the intended tree-shaking and performance benefits.
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