Redux 4.1.0 converts error messages from strings to error code indexesRedux 4.1.0 extracts error messages from production build, converts them into error code indexes, thereby shrinking the bundle size.
React 17 internally uses the browser's focusin and focusout events for onFocus and onBlur eventsReact's onFocus and onBlur events have switched to using the native focusin and focusout events under the hood.
React 17 adds support for KeyboardEvent.code property to SyntheticEventStarting with React 17, KeyboardEvent.code property is available on React keyboard event.
React 17 removes event pooling in the modern browsersReact 17 removes event pooling in modern browsers as it does not improve the performance and causes confusion.
React 17 stops event bubbling in scroll eventIn React 17 the scroll event no longer bubbles to align with browser's behavior.