New Architecture, Fabric, TurboModules & Hermes

Evaluate New Architecture, Fabric, TurboModules & Hermes on release devices through startup, JS/UI frame rate, memory, networking, crash recovery, permissions, signing, and store requirements—not only a debug build. Recheck New Architecture and dependency compatibility on every upgrade.

Build a Complete Mental Model

Apply It in Production React Native

Test an original New Architecture, Fabric, TurboModules & Hermes example on Android and iOS with small and large screens, font scaling, dark mode, keyboard and screen reader use, slow/offline networking, denied permissions, and background/foreground transitions. Use DevTools, tests, and a release build where relevant.

After This Lesson

Explain the shared-code and platform boundary
Build an example with loading, error, and accessibility states
Verify one Android/iOS behavior with a test or profiler

text

React state update
  → React render
  → Fabric Shadow Tree (C++)
  → Commit + Yoga layout
  → Native view mount

JavaScript engine: Hermes V1
Native interface: JSI + TurboModules
Typed bindings: Codegen

You should see

A clear model of render, commit, mount, and JavaScript/native boundaries.

Try It Yourself

Platform and Lifecycle Warning

Assuming one simulator's happy path proves every real-device, release-build, permission, accessibility, offline, and lifecycle path.

About the New Architecture — React Native

What you'll walk away with

Build a Complete Mental Model

Apply It in Production React Native

After This Lesson