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FlashList (Shopify)¶
FlashList is Shopify's open-source high-performance list component for React Native (github.com/shopify/flash-list). It is the canonical Shopify-owned third-party library consumed deeply within the Shopify mobile app itself, and is the reference example of a library that chose to support both React Native architectures from the same package version.
v2 — rebuilt on the New Architecture¶
Per Shopify's 2025 migration write-up (see sources/2025-09-12-shopify-migrating-to-react-natives-new-architecture): FlashList v2 was rebuilt from scratch on React Native's new architecture, leveraging measure-before-paint — Fabric's synchronous layout — to eliminate visual jumps and speed up screen loads for complex lists. FlashList v2's alpha intentionally ships dual-architecture support in the same package, so downstream consumers don't have to manage conditional version pinning.
Shopify's stated rationale for dual-arch support in FlashList v2: "Provide a version that supports both architectures. Managing conditional versioning isn't trivial — dual support significantly eases migration burden."
Why the v2 rewrite matters¶
Large React Native apps depend on list performance as the single biggest scroll-smoothness lever. FlashList's v1 was written against the old architecture's async rendering; v2's rewrite is an example of a third-party library doing a substantial engineering investment to track React Native's architecture shift and provide a clean migration path for consumers.
Per Shopify: the FlashList v2 post (linked from the migration writeup) "provides practical code examples on how to optimize rendering performance on the New Architecture."
Seen in¶
- sources/2025-09-12-shopify-migrating-to-react-natives-new-architecture — FlashList v2 cited as (a) the canonical dual-architecture support example, (b) the library whose rewrite validates measure-before-paint as a usable capability in React Native Fabric, and (c) the vehicle for Shopify's open-source contribution back to the community.
Stub¶
This page only covers what's said about FlashList in the Shopify-migration source. Deeper internals (v1 vs v2 data structures, viewport calculation, recycling strategy, benchmark numbers) would be covered by a dedicated FlashList post if ingested.
Related¶
- systems/react-native — the framework FlashList is built for.
- concepts/dual-architecture-compatibility — FlashList v2 is the canonical dual-architecture library example.
- patterns/upstream-fixes-to-community — Shopify's pattern of shipping improvements back to the community; FlashList is Shopify-owned but open-source.
- companies/shopify — company page.