Breaking Changes

Update Backends to use named exports for BackendFactory functions instead of default exports.

e.g.
import HTML5Backend from 'react-dnd-html5-backend
👇
import { HTML5Backend } from 'react-dnd-html5-backend

In general, throughout the app we've minimized the usage of default exports as well. They interfere with type correctness and screw with UMD builds (e.g. having to scrape a .default property off of a UMD global).

Minor Changes

• Expose internal hook useDragDropManager at top level
• Add profiling function to backend interface
• Make handler functions public on backends

Patch Changes

• Correct memory leak in drag previews (#2423)
• Improve and correct typings