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// Type definitions for React 17.0
// Project: https://react.dev/
// Definitions by: Asana <https://asana.com>
// AssureSign <http://www.assuresign.com>
// Microsoft <https://microsoft.com>
// John Reilly <https://github.com/johnnyreilly>
// Benoit Benezech <https://github.com/bbenezech>
// Patricio Zavolinsky <https://github.com/pzavolinsky>
// Eric Anderson <https://github.com/ericanderson>
// Dovydas Navickas <https://github.com/DovydasNavickas>
// Josh Rutherford <https://github.com/theruther4d>
// Guilherme Hübner <https://github.com/guilhermehubner>
// Ferdy Budhidharma <https://github.com/ferdaber>
// Johann Rakotoharisoa <https://github.com/jrakotoharisoa>
// Olivier Pascal <https://github.com/pascaloliv>
// Martin Hochel <https://github.com/hotell>
// Frank Li <https://github.com/franklixuefei>
// Jessica Franco <https://github.com/Jessidhia>
// Saransh Kataria <https://github.com/saranshkataria>
// Kanitkorn Sujautra <https://github.com/lukyth>
// Sebastian Silbermann <https://github.com/eps1lon>
// Kyle Scully <https://github.com/zieka>
// Cong Zhang <https://github.com/dancerphil>
// Dimitri Mitropoulos <https://github.com/dimitropoulos>
// JongChan Choi <https://github.com/disjukr>
// Victor Magalhães <https://github.com/vhfmag>
// Dale Tan <https://github.com/hellatan>
// Priyanshu Rav <https://github.com/priyanshurav>
// Costa Alexoglou <https://github.com/konsalex>
// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
/// <reference path="global.d.ts" />
import * as CSS from 'csstype';
import * as PropTypes from 'prop-types';
import { Interaction as SchedulerInteraction } from 'scheduler/tracing';
type NativeAnimationEvent = AnimationEvent;
type NativeClipboardEvent = ClipboardEvent;
type NativeCompositionEvent = CompositionEvent;
type NativeDragEvent = DragEvent;
type NativeFocusEvent = FocusEvent;
type NativeKeyboardEvent = KeyboardEvent;
type NativeMouseEvent = MouseEvent;
type NativeTouchEvent = TouchEvent;
type NativePointerEvent = PointerEvent;
type NativeTransitionEvent = TransitionEvent;
type NativeUIEvent = UIEvent;
type NativeWheelEvent = WheelEvent;
type Booleanish = boolean | 'true' | 'false';
type CrossOrigin = 'anonymous' | 'use-credentials' | '' | undefined;
declare const UNDEFINED_VOID_ONLY: unique symbol;
// Destructors are only allowed to return void.
type Destructor = () => void | { [UNDEFINED_VOID_ONLY]: never };
// eslint-disable-next-line @definitelytyped/export-just-namespace
export = React;
export as namespace React;
declare namespace React {
//
// React Elements
// ----------------------------------------------------------------------
type ElementType<P = any> =
{
[K in keyof JSX.IntrinsicElements]: P extends JSX.IntrinsicElements[K] ? K : never
}[keyof JSX.IntrinsicElements] |
ComponentType<P>;
/**
* @deprecated Please use `ElementType`
*/
type ReactType<P = any> = ElementType<P>;
type ComponentType<P = {}> = ComponentClass<P> | FunctionComponent<P>;
type JSXElementConstructor<P> =
| ((props: P) => ReactElement<any, any> | null)
| (new (props: P) => Component<any, any>);
interface RefObject<T> {
readonly current: T | null;
}
// Bivariance hack for consistent unsoundness with RefObject
type RefCallback<T> = { bivarianceHack(instance: T | null): void }["bivarianceHack"];
type Ref<T> = RefCallback<T> | RefObject<T> | null;
type LegacyRef<T> = string | Ref<T>;
/**
* Gets the instance type for a React element. The instance will be different for various component types:
*
* - React class components will be the class instance. So if you had `class Foo extends React.Component<{}> {}`
* and used `React.ElementRef<typeof Foo>` then the type would be the instance of `Foo`.
* - React stateless functional components do not have a backing instance and so `React.ElementRef<typeof Bar>`
* (when `Bar` is `function Bar() {}`) will give you the `undefined` type.
* - JSX intrinsics like `div` will give you their DOM instance. For `React.ElementRef<'div'>` that would be
* `HTMLDivElement`. For `React.ElementRef<'input'>` that would be `HTMLInputElement`.
* - React stateless functional components that forward a `ref` will give you the `ElementRef` of the forwarded
* to component.
*
* `C` must be the type _of_ a React component so you need to use typeof as in `React.ElementRef<typeof MyComponent>`.
*
* @todo In Flow, this works a little different with forwarded refs and the `AbstractComponent` that
* `React.forwardRef()` returns.
*/
type ElementRef<
C extends
| ForwardRefExoticComponent<any>
| { new (props: any): Component<any> }
| ((props: any, context?: any) => ReactElement | null)
| keyof JSX.IntrinsicElements
> =
// need to check first if `ref` is a valid prop for ts@3.0
// otherwise it will infer `{}` instead of `never`
"ref" extends keyof ComponentPropsWithRef<C>
? NonNullable<ComponentPropsWithRef<C>["ref"]> extends Ref<
infer Instance
>
? Instance
: never
: never;
type ComponentState = any;
type Key = string | number;
/**
* @internal You shouldn't need to use this type since you never see these attributes
* inside your component or have to validate them.
*/
interface Attributes {
key?: Key | null | undefined;
}
interface RefAttributes<T> extends Attributes {
ref?: Ref<T> | undefined;
}
interface ClassAttributes<T> extends Attributes {
ref?: LegacyRef<T> | undefined;
}
interface ReactElement<P = any, T extends string | JSXElementConstructor<any> = string | JSXElementConstructor<any>> {
type: T;
props: P;
key: Key | null;
}
interface ReactComponentElement<
T extends keyof JSX.IntrinsicElements | JSXElementConstructor<any>,
P = Pick<ComponentProps<T>, Exclude<keyof ComponentProps<T>, 'key' | 'ref'>>
> extends ReactElement<P, Exclude<T, number>> { }
/**
* @deprecated Please use `FunctionComponentElement`
*/
type SFCElement<P> = FunctionComponentElement<P>;
interface FunctionComponentElement<P> extends ReactElement<P, FunctionComponent<P>> {
ref?: ('ref' extends keyof P ? P extends { ref?: infer R | undefined } ? R : never : never) | undefined;
}
type CElement<P, T extends Component<P, ComponentState>> = ComponentElement<P, T>;
interface ComponentElement<P, T extends Component<P, ComponentState>> extends ReactElement<P, ComponentClass<P>> {
ref?: LegacyRef<T> | undefined;
}
type ClassicElement<P> = CElement<P, ClassicComponent<P, ComponentState>>;
// string fallback for custom web-components
interface DOMElement<P extends HTMLAttributes<T> | SVGAttributes<T>, T extends Element> extends ReactElement<P, string> {
ref: LegacyRef<T>;
}
// ReactHTML for ReactHTMLElement
interface ReactHTMLElement<T extends HTMLElement> extends DetailedReactHTMLElement<AllHTMLAttributes<T>, T> { }
interface DetailedReactHTMLElement<P extends HTMLAttributes<T>, T extends HTMLElement> extends DOMElement<P, T> {
type: keyof ReactHTML;
}
// ReactSVG for ReactSVGElement
interface ReactSVGElement extends DOMElement<SVGAttributes<SVGElement>, SVGElement> {
type: keyof ReactSVG;
}
interface ReactPortal extends ReactElement {
key: Key | null;
children: ReactNode;
}
//
// Factories
// ----------------------------------------------------------------------
type Factory<P> = (props?: Attributes & P, ...children: ReactNode[]) => ReactElement<P>;
/**
* @deprecated Please use `FunctionComponentFactory`
*/
type SFCFactory<P> = FunctionComponentFactory<P>;
type FunctionComponentFactory<P> = (props?: Attributes & P, ...children: ReactNode[]) => FunctionComponentElement<P>;
type ComponentFactory<P, T extends Component<P, ComponentState>> =
(props?: ClassAttributes<T> & P, ...children: ReactNode[]) => CElement<P, T>;
type CFactory<P, T extends Component<P, ComponentState>> = ComponentFactory<P, T>;
type ClassicFactory<P> = CFactory<P, ClassicComponent<P, ComponentState>>;
type DOMFactory<P extends DOMAttributes<T>, T extends Element> =
(props?: ClassAttributes<T> & P | null, ...children: ReactNode[]) => DOMElement<P, T>;
interface HTMLFactory<T extends HTMLElement> extends DetailedHTMLFactory<AllHTMLAttributes<T>, T> {}
interface DetailedHTMLFactory<P extends HTMLAttributes<T>, T extends HTMLElement> extends DOMFactory<P, T> {
(props?: ClassAttributes<T> & P | null, ...children: ReactNode[]): DetailedReactHTMLElement<P, T>;
}
interface SVGFactory extends DOMFactory<SVGAttributes<SVGElement>, SVGElement> {
(props?: ClassAttributes<SVGElement> & SVGAttributes<SVGElement> | null, ...children: ReactNode[]): ReactSVGElement;
}
//
// React Nodes
// ----------------------------------------------------------------------
type ReactText = string | number;
type ReactChild = ReactElement | ReactText;
/**
* @deprecated Use either `ReactNode[]` if you need an array or `Iterable<ReactNode>` if its passed to a host component.
*/
interface ReactNodeArray extends ReadonlyArray<ReactNode> {}
type ReactFragment = {} | Iterable<ReactNode>;
type ReactNode = ReactChild | ReactFragment | ReactPortal | boolean | null | undefined;
//
// Top Level API
// ----------------------------------------------------------------------
// DOM Elements
function createFactory<T extends HTMLElement>(
type: keyof ReactHTML): HTMLFactory<T>;
function createFactory(
type: keyof ReactSVG): SVGFactory;
function createFactory<P extends DOMAttributes<T>, T extends Element>(
type: string): DOMFactory<P, T>;
// Custom components
function createFactory<P>(type: FunctionComponent<P>): FunctionComponentFactory<P>;
function createFactory<P>(
type: ClassType<P, ClassicComponent<P, ComponentState>, ClassicComponentClass<P>>): CFactory<P, ClassicComponent<P, ComponentState>>;
function createFactory<P, T extends Component<P, ComponentState>, C extends ComponentClass<P>>(
type: ClassType<P, T, C>): CFactory<P, T>;
function createFactory<P>(type: ComponentClass<P>): Factory<P>;
// DOM Elements
// TODO: generalize this to everything in `keyof ReactHTML`, not just "input"
function createElement(
type: "input",
props?: InputHTMLAttributes<HTMLInputElement> & ClassAttributes<HTMLInputElement> | null,
...children: ReactNode[]): DetailedReactHTMLElement<InputHTMLAttributes<HTMLInputElement>, HTMLInputElement>;
function createElement<P extends HTMLAttributes<T>, T extends HTMLElement>(
type: keyof ReactHTML,
props?: ClassAttributes<T> & P | null,
...children: ReactNode[]): DetailedReactHTMLElement<P, T>;
function createElement<P extends SVGAttributes<T>, T extends SVGElement>(
type: keyof ReactSVG,
props?: ClassAttributes<T> & P | null,
...children: ReactNode[]): ReactSVGElement;
function createElement<P extends DOMAttributes<T>, T extends Element>(
type: string,
props?: ClassAttributes<T> & P | null,
...children: ReactNode[]): DOMElement<P, T>;
// Custom components
function createElement<P extends {}>(
type: FunctionComponent<P>,
props?: Attributes & P | null,
...children: ReactNode[]): FunctionComponentElement<P>;
function createElement<P extends {}>(
type: ClassType<P, ClassicComponent<P, ComponentState>, ClassicComponentClass<P>>,
props?: ClassAttributes<ClassicComponent<P, ComponentState>> & P | null,
...children: ReactNode[]): CElement<P, ClassicComponent<P, ComponentState>>;
function createElement<P extends {}, T extends Component<P, ComponentState>, C extends ComponentClass<P>>(
type: ClassType<P, T, C>,
props?: ClassAttributes<T> & P | null,
...children: ReactNode[]): CElement<P, T>;
function createElement<P extends {}>(
type: FunctionComponent<P> | ComponentClass<P> | string,
props?: Attributes & P | null,
...children: ReactNode[]): ReactElement<P>;
// DOM Elements
// ReactHTMLElement
function cloneElement<P extends HTMLAttributes<T>, T extends HTMLElement>(
element: DetailedReactHTMLElement<P, T>,
props?: P,
...children: ReactNode[]): DetailedReactHTMLElement<P, T>;
// ReactHTMLElement, less specific
function cloneElement<P extends HTMLAttributes<T>, T extends HTMLElement>(
element: ReactHTMLElement<T>,
props?: P,
...children: ReactNode[]): ReactHTMLElement<T>;
// SVGElement
function cloneElement<P extends SVGAttributes<T>, T extends SVGElement>(
element: ReactSVGElement,
props?: P,
...children: ReactNode[]): ReactSVGElement;
// DOM Element (has to be the last, because type checking stops at first overload that fits)
function cloneElement<P extends DOMAttributes<T>, T extends Element>(
element: DOMElement<P, T>,
props?: DOMAttributes<T> & P,
...children: ReactNode[]): DOMElement<P, T>;
// Custom components
function cloneElement<P>(
element: FunctionComponentElement<P>,
props?: Partial<P> & Attributes,
...children: ReactNode[]): FunctionComponentElement<P>;
function cloneElement<P, T extends Component<P, ComponentState>>(
element: CElement<P, T>,
props?: Partial<P> & ClassAttributes<T>,
...children: ReactNode[]): CElement<P, T>;
function cloneElement<P>(
element: ReactElement<P>,
props?: Partial<P> & Attributes,
...children: ReactNode[]): ReactElement<P>;
// Context via RenderProps
interface ProviderProps<T> {
value: T;
children?: ReactNode | undefined;
}
interface ConsumerProps<T> {
children: (value: T) => ReactNode;
}
// TODO: similar to how Fragment is actually a symbol, the values returned from createContext,
// forwardRef and memo are actually objects that are treated specially by the renderer; see:
// https://github.com/facebook/react/blob/v16.6.0/packages/react/src/ReactContext.js#L35-L48
// https://github.com/facebook/react/blob/v16.6.0/packages/react/src/forwardRef.js#L42-L45
// https://github.com/facebook/react/blob/v16.6.0/packages/react/src/memo.js#L27-L31
// However, we have no way of telling the JSX parser that it's a JSX element type or its props other than
// by pretending to be a normal component.
//
// We don't just use ComponentType or FunctionComponent types because you are not supposed to attach statics to this
// object, but rather to the original function.
interface ExoticComponent<P = {}> {
/**
* **NOTE**: Exotic components are not callable.
*/
(props: P): (ReactElement|null);
readonly $$typeof: symbol;
}
interface NamedExoticComponent<P = {}> extends ExoticComponent<P> {
displayName?: string | undefined;
}
interface ProviderExoticComponent<P> extends ExoticComponent<P> {
propTypes?: WeakValidationMap<P> | undefined;
}
type ContextType<C extends Context<any>> = C extends Context<infer T> ? T : never;
// NOTE: only the Context object itself can get a displayName
// https://github.com/facebook/react-devtools/blob/e0b854e4c/backend/attachRendererFiber.js#L310-L325
type Provider<T> = ProviderExoticComponent<ProviderProps<T>>;
type Consumer<T> = ExoticComponent<ConsumerProps<T>>;
interface Context<T> {
Provider: Provider<T>;
Consumer: Consumer<T>;
displayName?: string | undefined;
}
function createContext<T>(
// If you thought this should be optional, see
// https://github.com/DefinitelyTyped/DefinitelyTyped/pull/24509#issuecomment-382213106
defaultValue: T,
): Context<T>;
function isValidElement<P>(object: {} | null | undefined): object is ReactElement<P>;
const Children: ReactChildren;
const Fragment: ExoticComponent<{ children?: ReactNode | undefined }>;
const StrictMode: ExoticComponent<{ children?: ReactNode | undefined }>;
interface SuspenseProps {
children?: ReactNode | undefined;
// TODO(react18): `fallback?: ReactNode;`
/** A fallback react tree to show when a Suspense child (like React.lazy) suspends */
fallback: NonNullable<ReactNode>|null;
}
// TODO(react18): Updated JSDoc to reflect that Suspense works on the server.
/**
* This feature is not yet available for server-side rendering.
* Suspense support will be added in a later release.
*/
const Suspense: ExoticComponent<SuspenseProps>;
const version: string;
/**
* {@link https://react.dev/reference/react/Profiler#onrender-callback Profiler API}}
*/
type ProfilerOnRenderCallback = (
id: string,
phase: "mount" | "update",
actualDuration: number,
baseDuration: number,
startTime: number,
commitTime: number,
interactions: Set<SchedulerInteraction>,
) => void;
interface ProfilerProps {
children?: ReactNode | undefined;
id: string;
onRender: ProfilerOnRenderCallback;
}
const Profiler: ExoticComponent<ProfilerProps>;
//
// Component API
// ----------------------------------------------------------------------
type ReactInstance = Component<any> | Element;
// Base component for plain JS classes
interface Component<P = {}, S = {}, SS = any> extends ComponentLifecycle<P, S, SS> { }
class Component<P, S> {
// tslint won't let me format the sample code in a way that vscode likes it :(
/**
* If set, `this.context` will be set at runtime to the current value of the given Context.
*
* Usage:
*
* ```ts
* type MyContext = number
* const Ctx = React.createContext<MyContext>(0)
*
* class Foo extends React.Component {
* static contextType = Ctx
* context!: React.ContextType<typeof Ctx>
* render () {
* return <>My context's value: {this.context}</>;
* }
* }
* ```
*
* @see https://react.dev/reference/react/Component#static-contexttype
*/
static contextType?: Context<any> | undefined;
/**
* If using the new style context, re-declare this in your class to be the
* `React.ContextType` of your `static contextType`.
* Should be used with type annotation or static contextType.
*
* ```ts
* static contextType = MyContext
* // For TS pre-3.7:
* context!: React.ContextType<typeof MyContext>
* // For TS 3.7 and above:
* declare context: React.ContextType<typeof MyContext>
* ```
*
* @see https://react.dev/reference/react/Component#context
*/
// TODO (TypeScript 3.0): unknown
context: any;
constructor(props: Readonly<P> | P);
/**
* @deprecated
* @see https://legacy.reactjs.org/docs/legacy-context.html
*/
constructor(props: P, context: any);
// We MUST keep setState() as a unified signature because it allows proper checking of the method return type.
// See: https://github.com/DefinitelyTyped/DefinitelyTyped/issues/18365#issuecomment-351013257
// Also, the ` | S` allows intellisense to not be dumbisense
setState<K extends keyof S>(
state: ((prevState: Readonly<S>, props: Readonly<P>) => (Pick<S, K> | S | null)) | (Pick<S, K> | S | null),
callback?: () => void
): void;
forceUpdate(callback?: () => void): void;
render(): ReactNode;
// React.Props<T> is now deprecated, which means that the `children`
// property is not available on `P` by default, even though you can
// always pass children as variadic arguments to `createElement`.
// In the future, if we can define its call signature conditionally
// on the existence of `children` in `P`, then we should remove this.
readonly props: Readonly<P> & Readonly<{ children?: ReactNode | undefined }>;
state: Readonly<S>;
/**
* @deprecated
* https://legacy.reactjs.org/docs/refs-and-the-dom.html#legacy-api-string-refs
*/
refs: {
[key: string]: ReactInstance
};
}
class PureComponent<P = {}, S = {}, SS = any> extends Component<P, S, SS> { }
interface ClassicComponent<P = {}, S = {}> extends Component<P, S> {
replaceState(nextState: S, callback?: () => void): void;
isMounted(): boolean;
getInitialState?(): S;
}
interface ChildContextProvider<CC> {
getChildContext(): CC;
}
//
// Class Interfaces
// ----------------------------------------------------------------------
/**
* @deprecated as of recent React versions, function components can no
* longer be considered 'stateless'. Please use `FunctionComponent` instead.
*
* @see [React Hooks](https://reactjs.org/docs/hooks-intro.html)
*/
type SFC<P = {}> = FunctionComponent<P>;
/**
* @deprecated as of recent React versions, function components can no
* longer be considered 'stateless'. Please use `FunctionComponent` instead.
*
* @see [React Hooks](https://reactjs.org/docs/hooks-intro.html)
*/
type StatelessComponent<P = {}> = FunctionComponent<P>;
type FC<P = {}> = FunctionComponent<P>;
interface FunctionComponent<P = {}> {
(props: PropsWithChildren<P>, context?: any): ReactElement<any, any> | null;
propTypes?: WeakValidationMap<P> | undefined;
contextTypes?: ValidationMap<any> | undefined;
defaultProps?: Partial<P> | undefined;
displayName?: string | undefined;
}
type VFC<P = {}> = VoidFunctionComponent<P>;
interface VoidFunctionComponent<P = {}> {
(props: P, context?: any): ReactElement<any, any> | null;
propTypes?: WeakValidationMap<P> | undefined;
contextTypes?: ValidationMap<any> | undefined;
defaultProps?: Partial<P> | undefined;
displayName?: string | undefined;
}
type ForwardedRef<T> = ((instance: T | null) => void) | MutableRefObject<T | null> | null;
interface ForwardRefRenderFunction<T, P = {}> {
(props: PropsWithChildren<P>, ref: ForwardedRef<T>): ReactElement | null;
displayName?: string | undefined;
// explicit rejected with `never` required due to
// https://github.com/microsoft/TypeScript/issues/36826
/**
* defaultProps are not supported on render functions
*/
defaultProps?: never | undefined;
/**
* propTypes are not supported on render functions
*/
propTypes?: never | undefined;
}
/**
* @deprecated Use ForwardRefRenderFunction. forwardRef doesn't accept a
* "real" component.
*/
interface RefForwardingComponent <T, P = {}> extends ForwardRefRenderFunction<T, P> {}
interface ComponentClass<P = {}, S = ComponentState> extends StaticLifecycle<P, S> {
new (props: P, context?: any): Component<P, S>;
propTypes?: WeakValidationMap<P> | undefined;
contextType?: Context<any> | undefined;
contextTypes?: ValidationMap<any> | undefined;
childContextTypes?: ValidationMap<any> | undefined;
defaultProps?: Partial<P> | undefined;
displayName?: string | undefined;
}
interface ClassicComponentClass<P = {}> extends ComponentClass<P> {
new (props: P, context?: any): ClassicComponent<P, ComponentState>;
getDefaultProps?(): P;
}
/**
* We use an intersection type to infer multiple type parameters from
* a single argument, which is useful for many top-level API defs.
* See https://github.com/Microsoft/TypeScript/issues/7234 for more info.
*/
type ClassType<P, T extends Component<P, ComponentState>, C extends ComponentClass<P>> =
C &
(new (props: P, context?: any) => T);
//
// Component Specs and Lifecycle
// ----------------------------------------------------------------------
// This should actually be something like `Lifecycle<P, S> | DeprecatedLifecycle<P, S>`,
// as React will _not_ call the deprecated lifecycle methods if any of the new lifecycle
// methods are present.
interface ComponentLifecycle<P, S, SS = any> extends NewLifecycle<P, S, SS>, DeprecatedLifecycle<P, S> {
/**
* Called immediately after a component is mounted. Setting state here will trigger re-rendering.
*/
componentDidMount?(): void;
/**
* Called to determine whether the change in props and state should trigger a re-render.
*
* `Component` always returns true.
* `PureComponent` implements a shallow comparison on props and state and returns true if any
* props or states have changed.
*
* If false is returned, `Component#render`, `componentWillUpdate`
* and `componentDidUpdate` will not be called.
*/
shouldComponentUpdate?(nextProps: Readonly<P>, nextState: Readonly<S>, nextContext: any): boolean;
/**
* Called immediately before a component is destroyed. Perform any necessary cleanup in this method, such as
* cancelled network requests, or cleaning up any DOM elements created in `componentDidMount`.
*/
componentWillUnmount?(): void;
/**
* Catches exceptions generated in descendant components. Unhandled exceptions will cause
* the entire component tree to unmount.
*/
componentDidCatch?(error: Error, errorInfo: ErrorInfo): void;
}
// Unfortunately, we have no way of declaring that the component constructor must implement this
interface StaticLifecycle<P, S> {
getDerivedStateFromProps?: GetDerivedStateFromProps<P, S> | undefined;
getDerivedStateFromError?: GetDerivedStateFromError<P, S> | undefined;
}
type GetDerivedStateFromProps<P, S> =
/**
* Returns an update to a component's state based on its new props and old state.
*
* Note: its presence prevents any of the deprecated lifecycle methods from being invoked
*/
(nextProps: Readonly<P>, prevState: S) => Partial<S> | null;
type GetDerivedStateFromError<P, S> =
/**
* This lifecycle is invoked after an error has been thrown by a descendant component.
* It receives the error that was thrown as a parameter and should return a value to update state.
*
* Note: its presence prevents any of the deprecated lifecycle methods from being invoked
*/
(error: any) => Partial<S> | null;
// This should be "infer SS" but can't use it yet
interface NewLifecycle<P, S, SS> {
/**
* Runs before React applies the result of `render` to the document, and
* returns an object to be given to componentDidUpdate. Useful for saving
* things such as scroll position before `render` causes changes to it.
*
* Note: the presence of getSnapshotBeforeUpdate prevents any of the deprecated
* lifecycle events from running.
*/
getSnapshotBeforeUpdate?(prevProps: Readonly<P>, prevState: Readonly<S>): SS | null;
/**
* Called immediately after updating occurs. Not called for the initial render.
*
* The snapshot is only present if getSnapshotBeforeUpdate is present and returns non-null.
*/
componentDidUpdate?(prevProps: Readonly<P>, prevState: Readonly<S>, snapshot?: SS): void;
}
interface DeprecatedLifecycle<P, S> {
/**
* Called immediately before mounting occurs, and before `Component#render`.
* Avoid introducing any side-effects or subscriptions in this method.
*
* Note: the presence of getSnapshotBeforeUpdate or getDerivedStateFromProps
* prevents this from being invoked.
*
* @deprecated 16.3, use componentDidMount or the constructor instead; will stop working in React 17
* @see https://legacy.reactjs.org/blog/2018/03/27/update-on-async-rendering.html#initializing-state
* @see https://legacy.reactjs.org/blog/2018/03/27/update-on-async-rendering.html#gradual-migration-path
*/
componentWillMount?(): void;
/**
* Called immediately before mounting occurs, and before `Component#render`.
* Avoid introducing any side-effects or subscriptions in this method.
*
* This method will not stop working in React 17.
*
* Note: the presence of getSnapshotBeforeUpdate or getDerivedStateFromProps
* prevents this from being invoked.
*
* @deprecated 16.3, use componentDidMount or the constructor instead
* @see https://legacy.reactjs.org/blog/2018/03/27/update-on-async-rendering.html#initializing-state
* @see https://legacy.reactjs.org/blog/2018/03/27/update-on-async-rendering.html#gradual-migration-path
*/
UNSAFE_componentWillMount?(): void;
/**
* Called when the component may be receiving new props.
* React may call this even if props have not changed, so be sure to compare new and existing
* props if you only want to handle changes.
*
* Calling `Component#setState` generally does not trigger this method.
*
* Note: the presence of getSnapshotBeforeUpdate or getDerivedStateFromProps
* prevents this from being invoked.
*
* @deprecated 16.3, use static getDerivedStateFromProps instead; will stop working in React 17
* @see https://legacy.reactjs.org/blog/2018/03/27/update-on-async-rendering.html#updating-state-based-on-props
* @see https://legacy.reactjs.org/blog/2018/03/27/update-on-async-rendering.html#gradual-migration-path
*/
componentWillReceiveProps?(nextProps: Readonly<P>, nextContext: any): void;
/**
* Called when the component may be receiving new props.
* React may call this even if props have not changed, so be sure to compare new and existing
* props if you only want to handle changes.
*
* Calling `Component#setState` generally does not trigger this method.
*
* This method will not stop working in React 17.
*
* Note: the presence of getSnapshotBeforeUpdate or getDerivedStateFromProps
* prevents this from being invoked.
*
* @deprecated 16.3, use static getDerivedStateFromProps instead
* @see https://legacy.reactjs.org/blog/2018/03/27/update-on-async-rendering.html#updating-state-based-on-props
* @see https://legacy.reactjs.org/blog/2018/03/27/update-on-async-rendering.html#gradual-migration-path
*/
UNSAFE_componentWillReceiveProps?(nextProps: Readonly<P>, nextContext: any): void;
/**
* Called immediately before rendering when new props or state is received. Not called for the initial render.
*
* Note: You cannot call `Component#setState` here.
*
* Note: the presence of getSnapshotBeforeUpdate or getDerivedStateFromProps
* prevents this from being invoked.
*
* @deprecated 16.3, use getSnapshotBeforeUpdate instead; will stop working in React 17
* @see https://legacy.reactjs.org/blog/2018/03/27/update-on-async-rendering.html#reading-dom-properties-before-an-update
* @see https://legacy.reactjs.org/blog/2018/03/27/update-on-async-rendering.html#gradual-migration-path
*/
componentWillUpdate?(nextProps: Readonly<P>, nextState: Readonly<S>, nextContext: any): void;
/**
* Called immediately before rendering when new props or state is received. Not called for the initial render.
*
* Note: You cannot call `Component#setState` here.
*
* This method will not stop working in React 17.
*
* Note: the presence of getSnapshotBeforeUpdate or getDerivedStateFromProps
* prevents this from being invoked.
*
* @deprecated 16.3, use getSnapshotBeforeUpdate instead
* @see https://legacy.reactjs.org/blog/2018/03/27/update-on-async-rendering.html#reading-dom-properties-before-an-update
* @see https://legacy.reactjs.org/blog/2018/03/27/update-on-async-rendering.html#gradual-migration-path
*/
UNSAFE_componentWillUpdate?(nextProps: Readonly<P>, nextState: Readonly<S>, nextContext: any): void;
}
interface Mixin<P, S> extends ComponentLifecycle<P, S> {
mixins?: Array<Mixin<P, S>> | undefined;
statics?: {
[key: string]: any;
} | undefined;
displayName?: string | undefined;
propTypes?: ValidationMap<any> | undefined;
contextTypes?: ValidationMap<any> | undefined;
childContextTypes?: ValidationMap<any> | undefined;
getDefaultProps?(): P;
getInitialState?(): S;
}
interface ComponentSpec<P, S> extends Mixin<P, S> {
render(): ReactNode;
[propertyName: string]: any;
}
function createRef<T>(): RefObject<T>;
// will show `ForwardRef(${Component.displayName || Component.name})` in devtools by default,
// but can be given its own specific name
interface ForwardRefExoticComponent<P> extends NamedExoticComponent<P> {
defaultProps?: Partial<P> | undefined;
propTypes?: WeakValidationMap<P> | undefined;
}
function forwardRef<T, P = {}>(render: ForwardRefRenderFunction<T, P>): ForwardRefExoticComponent<PropsWithoutRef<P> & RefAttributes<T>>;
/** Ensures that the props do not include ref at all */
type PropsWithoutRef<P> =
// Omit would not be sufficient for this. We'd like to avoid unnecessary mapping and need a distributive conditional to support unions.
// see: https://www.typescriptlang.org/docs/handbook/2/conditional-types.html#distributive-conditional-types
// https://github.com/Microsoft/TypeScript/issues/28339
P extends any ? ('ref' extends keyof P ? Omit<P, 'ref'> : P) : P;
/** Ensures that the props do not include string ref, which cannot be forwarded */
type PropsWithRef<P> =
// Just "P extends { ref?: infer R }" looks sufficient, but R will infer as {} if P is {}.
'ref' extends keyof P
? P extends { ref?: infer R | undefined }
? string extends R
? PropsWithoutRef<P> & { ref?: Exclude<R, string> | undefined }
: P
: P
: P;
type PropsWithChildren<P> = P & { children?: ReactNode | undefined };
/**
* NOTE: prefer ComponentPropsWithRef, if the ref is forwarded,
* or ComponentPropsWithoutRef when refs are not supported.
*/
type ComponentProps<T extends keyof JSX.IntrinsicElements | JSXElementConstructor<any>> =
T extends JSXElementConstructor<infer P>
? P
: T extends keyof JSX.IntrinsicElements
? JSX.IntrinsicElements[T]
: {};
type ComponentPropsWithRef<T extends ElementType> =
T extends (new (props: infer P) => Component<any, any>)
? PropsWithoutRef<P> & RefAttributes<InstanceType<T>>
: PropsWithRef<ComponentProps<T>>;
type ComponentPropsWithoutRef<T extends ElementType> =
PropsWithoutRef<ComponentProps<T>>;
type ComponentRef<T extends ElementType> = T extends NamedExoticComponent<
ComponentPropsWithoutRef<T> & RefAttributes<infer Method>
>
? Method
: ComponentPropsWithRef<T> extends RefAttributes<infer Method>
? Method
: never;
// will show `Memo(${Component.displayName || Component.name})` in devtools by default,
// but can be given its own specific name
type MemoExoticComponent<T extends ComponentType<any>> = NamedExoticComponent<ComponentPropsWithRef<T>> & {
readonly type: T;
};
function memo<P extends object>(
Component: FunctionComponent<P>,
propsAreEqual?: (prevProps: Readonly<PropsWithChildren<P>>, nextProps: Readonly<PropsWithChildren<P>>) => boolean
): NamedExoticComponent<P>;
function memo<T extends ComponentType<any>>(
Component: T,
propsAreEqual?: (prevProps: Readonly<ComponentProps<T>>, nextProps: Readonly<ComponentProps<T>>) => boolean
): MemoExoticComponent<T>;
type LazyExoticComponent<T extends ComponentType<any>> = ExoticComponent<ComponentPropsWithRef<T>> & {
readonly _result: T;
};
function lazy<T extends ComponentType<any>>(
factory: () => Promise<{ default: T }>
): LazyExoticComponent<T>;
//
// React Hooks
// ----------------------------------------------------------------------
// based on the code in https://github.com/facebook/react/pull/13968
// Unlike the class component setState, the updates are not allowed to be partial
type SetStateAction<S> = S | ((prevState: S) => S);
// this technically does accept a second argument, but it's already under a deprecation warning
// and it's not even released so probably better to not define it.
type Dispatch<A> = (value: A) => void;
// Since action _can_ be undefined, dispatch may be called without any parameters.
type DispatchWithoutAction = () => void;
// Unlike redux, the actions _can_ be anything
type Reducer<S, A> = (prevState: S, action: A) => S;
// If useReducer accepts a reducer without action, dispatch may be called without any parameters.
type ReducerWithoutAction<S> = (prevState: S) => S;
// types used to try and prevent the compiler from reducing S
// to a supertype common with the second argument to useReducer()
type ReducerState<R extends Reducer<any, any>> = R extends Reducer<infer S, any> ? S : never;
type ReducerAction<R extends Reducer<any, any>> = R extends Reducer<any, infer A> ? A : never;
// The identity check is done with the SameValue algorithm (Object.is), which is stricter than ===
type ReducerStateWithoutAction<R extends ReducerWithoutAction<any>> =
R extends ReducerWithoutAction<infer S> ? S : never;
// TODO (TypeScript 3.0): ReadonlyArray<unknown>
type DependencyList = ReadonlyArray<any>;
// NOTE: callbacks are _only_ allowed to return either void, or a destructor.
type EffectCallback = () => (void | Destructor);
interface MutableRefObject<T> {
current: T;
}
// This will technically work if you give a Consumer<T> or Provider<T> but it's deprecated and warns
/**
* Accepts a context object (the value returned from `React.createContext`) and returns the current
* context value, as given by the nearest context provider for the given context.
*
* @version 16.8.0
* @see https://react.dev/reference/react/useContext
*/
function useContext<T>(context: Context<T>/*, (not public API) observedBits?: number|boolean */): T;
/**
* Returns a stateful value, and a function to update it.
*
* @version 16.8.0
* @see https://react.dev/reference/react/useState
*/
function useState<S>(initialState: S | (() => S)): [S, Dispatch<SetStateAction<S>>];
// convenience overload when first argument is omitted
/**
* Returns a stateful value, and a function to update it.
*
* @version 16.8.0
* @see https://react.dev/reference/react/useState
*/
function useState<S = undefined>(): [S | undefined, Dispatch<SetStateAction<S | undefined>>];
/**
* An alternative to `useState`.
*
* `useReducer` is usually preferable to `useState` when you have complex state logic that involves
* multiple sub-values. It also lets you optimize performance for components that trigger deep
* updates because you can pass `dispatch` down instead of callbacks.
*
* @version 16.8.0
* @see https://react.dev/reference/react/useReducer
*/
// overload where dispatch could accept 0 arguments.
function useReducer<R extends ReducerWithoutAction<any>, I>(
reducer: R,
initializerArg: I,
initializer: (arg: I) => ReducerStateWithoutAction<R>
): [ReducerStateWithoutAction<R>, DispatchWithoutAction];
/**
* An alternative to `useState`.
*
* `useReducer` is usually preferable to `useState` when you have complex state logic that involves
* multiple sub-values. It also lets you optimize performance for components that trigger deep
* updates because you can pass `dispatch` down instead of callbacks.
*
* @version 16.8.0
* @see https://react.dev/reference/react/useReducer
*/
// overload where dispatch could accept 0 arguments.
function useReducer<R extends ReducerWithoutAction<any>>(
reducer: R,
initializerArg: ReducerStateWithoutAction<R>,
initializer?: undefined
): [ReducerStateWithoutAction<R>, DispatchWithoutAction];
/**
* An alternative to `useState`.
*
* `useReducer` is usually preferable to `useState` when you have complex state logic that involves
* multiple sub-values. It also lets you optimize performance for components that trigger deep
* updates because you can pass `dispatch` down instead of callbacks.
*
* @version 16.8.0
* @see https://react.dev/reference/react/useReducer
*/
// overload where "I" may be a subset of ReducerState<R>; used to provide autocompletion.
// If "I" matches ReducerState<R> exactly then the last overload will allow initializer to be omitted.
// the last overload effectively behaves as if the identity function (x => x) is the initializer.
function useReducer<R extends Reducer<any, any>, I>(
reducer: R,
initializerArg: I & ReducerState<R>,
initializer: (arg: I & ReducerState<R>) => ReducerState<R>
): [ReducerState<R>, Dispatch<ReducerAction<R>>];
/**
* An alternative to `useState`.
*
* `useReducer` is usually preferable to `useState` when you have complex state logic that involves
* multiple sub-values. It also lets you optimize performance for components that trigger deep
* updates because you can pass `dispatch` down instead of callbacks.
*
* @version 16.8.0
* @see https://react.dev/reference/react/useReducer
*/
// overload for free "I"; all goes as long as initializer converts it into "ReducerState<R>".
function useReducer<R extends Reducer<any, any>, I>(
reducer: R,
initializerArg: I,
initializer: (arg: I) => ReducerState<R>
): [ReducerState<R>, Dispatch<ReducerAction<R>>];
/**
* An alternative to `useState`.
*
* `useReducer` is usually preferable to `useState` when you have complex state logic that involves
* multiple sub-values. It also lets you optimize performance for components that trigger deep