[react] Types for 19

[eps1lon]

React 19 is not released. This issue is meant to collect type-related breaking changes we want to ship with the next major:

1. [react]: Infer state type for useReducer
2. default P of ReactElement to unknown
   I missed to do this in React 18. It'll also help mitigate 5.0: Narrowing from type-guards ignored when constructing JSX call (2604) microsoft/TypeScript#53178. See react-native: Ensure elements narrowed by isValidElement are valid props #64840
3. (codemod: refobject-defaults) refs are mutable by default. RefObject will not include null by default: [react] Make all refs mutable by default
4. (codemod: useref-required-initial) Require initial value for useRef: [react] Require initial value for useRef #64920
5. (codemod: scoped-jsx) Remove deprecated global JSX namespace: [react] Add JSX namespace to React namespace #64464
6. Remove deprecated React.SFCFactory
7. (codemod: deprecated-react-text) Remove deprecated React.ReactText
8. (codemod: deprecated-react-child) Remove deprecated React.ReactChild
9. (codemod: deprecated-react-node-array) Remove deprecated React.ReactNodeArray
10. Remove deprecated ReactFragment
11. (codemod: deprecated-void-function-component) Remove deprecated React.VFC
12. (codemod: deprecated-void-function-component) Remove deprecated React.VoidFunctionComponent
13. Remove deprecated React.ReactChildren
14. Remove deprecated React.ComponentSpec (use createReactClass.ComponentSpec instead)
15. Remove deprecated React.Mixin (use createReactClass.Mixin instead)
16. Remove deprecated React.ClassicElement<Props> (use createReactClass.ClassicElement<Props, InstanceType<T>>
17. Remove deprecated React.ClassicComponentClass (use createReactClass.ClassicComponentClass)
18. Remove deprecated React.ClassicComponent (use createClass.ClassicComponent)
19. (codemod: deprecated-prop-types-types) Remove deprecated React.Requireable (use propTypes.Requireable)
20. (codemod: deprecated-prop-types-types) Remove deprecated React.Validator (use propTypes.Validator)
21. (codemod: deprecated-prop-types-types) Remove deprecated React.ValidationMap (use propTypes.ValidationMap)
22. (codemod: deprecated-prop-types-types) Remove deprecated React.WeakValidationMap (use propTypes.WeakValidationMap)

Type changes to reflect runtime changes

• enableFormActions and enableAsyncActions
• rendering bigint, Promise and React Context (see [react] Revert "Allow React context in ReactNode" #69347 for why no context yet)
• new DOM Transition event handlers
• enableNewBooleanProps
• requestFormReset
• onCaughtError, onUncaughtError
• Remove createFactory
• Remove defaultProps on everything but class components
• Remove Stop typing propTypes
• Remove render
• Remove findDOMNode
• Remove renderToNodeStream
• Remove hydrate
• Remove unmountComponentAtNode
• Remove unstable_renderSubtreeIntoContainer
• Remove everything from test-utils but act
• Remove ErrorInfo#digest
• enableFloat
• Switch <Context> to mean <Context.Provider>
• enableRefAsProps
• ref cleanup functions
• React.act
• Remove react-test-renderer/shallow

codemods: eps1lon/types-react-codemod#314
Work-in-progress PR (changes to to 3rd party libraries using deprecated changes will be cherry-picked separately to keep the diff small): Pending

[typescript-bot]

Thanks for the discussion about "react", some useful links for everyone:

• npm
• DT
• Related discussions

Pinging the DT module owners: @johnnyreilly, @bbenezech, @pzavolinsky, @ericanderson, @DovydasNavickas, @theruther4d, @guilhermehubner, @ferdaber, @jrakotoharisoa, @pascaloliv, @Hotell, @franklixuefei, @Jessidhia, @saranshkataria, @lukyth, @eps1lon, @zieka, @dancerphil, @dimitropoulos, @disjukr, @vhfmag, @hellatan, @priyanshurav, @Semigradsky, @mattpocock.

[eps1lon]

Added "default P of ReactElement to unknown"

[Semigradsky]

This one? #64099

[eps1lon]

Not sure about this one since this apparently didn't catch any real-word issues. But it will require props changes where people accept mutable props even though they only use it as readable.

So I sympathize but TypeScript is all about making pragmatic decisions considering type-safety.

[eps1lon]

Added #64896

[eps1lon]

Added scoped instead of global namespace: #64464

[peterblazejewicz]

fyi: pinned for improved transparency

[eps1lon]

Added Classic* types deprecated in #68091

[codershiba]

Deprecated ReactComponentElement type in #68457

[eps1lon]

Added deprecation of types related to propTypes in #69002

[vincent-thomas]

Will forwardRef and the default prop 'ref' in components be addressed here?

[eps1lon]

the default prop 'ref' in components be addressed here?

Yep.

What should we adress about forwardRef?

[hamirmahal]

Leaving a link to #69635 in case it's relevant