react-hot-loader is a developer utility for updating React components and hooks in real time. It functions as a state-preserving UI updater that wraps components in proxies, allowing the underlying logic to be replaced without unmounting the component tree.
The tool maintains internal application state across hot module updates by swapping component logic while keeping the mount point constant. It includes mechanisms to intercept rendering errors during updates through temporary error boundaries and manages hook-order validation to prevent state mismatches when functional hooks change.
The project integrates with module bundlers to automate the injection of hot replacement logic. Its capability surface covers real-time updates for lazy-loaded and code-split components, module replacement diagnostics, and the ability to exclude specific components from the reloading process.
