Hooks: Introduces the experimental Hooks feature, allowing you to use state and lifecycle features without writing a class. This enhances your ability to manage component state and side effects in a more functional way.
Improvements
Performance: Enables hooks in the www build, ensuring that the dispatcher and implementation are included in the bundle, which improves the overall functionality of your applications.
Debugging: Adds a Debug Tools Package for introspection of hooks, allowing you to easily inspect the state of primitive and custom hooks within your components.
Fixes
Fix crash during server render in React 16.6.0, ensuring that applications run smoothly without unexpected crashes when using certain runtimes.
Fixes issues with lazy loading components, ensuring that defaultProps work correctly and that components render as expected without errors.
Others
Enhance error handling by recovering from errors with a boundary during the completion phase, improving the robustness of your applications.
Update warning messages for common pitfalls in using hooks, helping developers avoid mistakes and improve code quality.