Dev Server

Turbopack is optimized to give you an extremely fast development server. We considered these features indispensable.

HMR

Hot Module Replacement (HMR) gives your dev server the ability to push file updates to the browser without triggering a full refresh. This works for most static assets (including JavaScript files) enabling a smooth and fast developer experience.

Turbopack supports Hot Module Replacement out of the box. Because of our incremental architecture, we are hyper-optimized for delivering fast updates.

Fast Refresh

Fast Refresh builds on top of HMR by providing a framework-level integration to preserve state across updates. Changes to a <Count /> component, for instance, would preserve the component's internal count across changes.

Turbopack supports Fast Refresh out of the box for React. Support for other frameworks will be added over time.