React Native’s New Code Splitting Techniques
1 ) Introduction to Code Splitting in React Native
Code splitting is essential in React Native apps to enhance performance by loading code only when needed.
Parsing and running JavaScript consumes memory and time, so deferring non essential code helps improve app startup speed and overall efficiency.
2 ) Recommended Techniques for Optimizing JavaScript Loading
Use Hermes Engine: React Native’s default JavaScript engine Hermes compiles JavaScript to bytecode ahead of time. The bytecode is loaded on demand, reducing parsing time and memory usage.
Lazy loading Large Components: Utilize React’s `lazy` and `Suspense` APIs to defer loading components until they are actually needed. This is especially useful for screen level components, preventing unnecessary code loading on app startup.
Avoid Module Side Effects: Components and their modules should not have side effects such as global variable modifications or external subscriptions. Side effects can compromise the benefits of lazy loading by executing code prematurely.
3 ) Advanced Code Splitting Strategies
Inline require calls: Instead of static imports, use `require()` function calls inside event handlers or callback functions to load code only when required. This manual deferral can be useful for rarely used or very large dependencies.
Example: Loading an expensive component only after a user interaction triggers `require()`.
Automatic Inline Requires with React Native CLI: The React Native CLI can automatically inline `require` calls (not static imports) to lazy load code both in your app and third party modules, further optimizing resource usage and startup times.
4 ) Platform Specific Code Splitting
React Native supports platform specific modules via file extensions (`.ios.js`, `.android.js`) allowing you to split the codebase for different platforms, reducing irrelevant code loading.
Additionally, the built in `Platform` module helps implement conditional code paths or styling depending on OS, enabling more granular and efficient code usage.
Summary:
React Native’s new code splitting techniques focus on deferring JavaScript execution to improve performance and reduce app load times. Recommended approaches include using Hermes for bytecode compilation, lazy loading components with React’s API, avoiding side effects in modules, and leveraging platform specific files. Advanced developers can manually inline require calls or rely on React Native CLI optimizations to further enhance code loading efficiency in complex applications.
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