Breaking Changes:

• We will stop publishing new versions of flow-parser-bin. If you want to parse flow code with native-like performance, you should use hermes-parser package, which is running on wasm.

Likely to cause new Flow errors:

• The deprecated React$Element type is now removed. You should use React.Node or React.MixedElement in most cases. If you really want exact react elements, you can use ExactReactElement_DEPRECATED

New Features:

• Flow has full React 19 ref-as-prop support. Since this version, you are allowed to spread ref prop in component syntax components.

IDE:

• We now provide a rewrite refactor to convert arrays, map, set, and object types into their readonly forms.