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/**
* Copyright (c) Meta Platforms, Inc. and affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
* @flow
*/
/**
* A UI node that can be rendered by React. React can render most primitives in
* addition to elements and arrays of nodes.
*/
declare type React$Node =
| void
| null
| boolean
| number
| string
| React$Element<any>
| React$Portal
| Iterable<?React$Node>;
/**
* Base class of ES6 React classes, modeled as a polymorphic class whose main
* type parameters are Props and State.
*/
declare class React$Component<Props, State = void> {
// fields
props: Props;
state: State;
// action methods
setState(
partialState: ?$ReadOnly<Partial<State>> | ((State, Props) => ?$ReadOnly<Partial<State>>),
callback?: () => mixed,
): void;
forceUpdate(callback?: () => void): void;
// lifecycle methods
constructor(props?: Props, context?: any): void;
render(): React$Node;
componentWillMount(): mixed;
UNSAFE_componentWillMount(): mixed;
componentDidMount(): mixed;
componentWillReceiveProps(
nextProps: Props,
nextContext: any,
): mixed;
UNSAFE_componentWillReceiveProps(
nextProps: Props,
nextContext: any,
): mixed;
shouldComponentUpdate(
nextProps: Props,
nextState: State,
nextContext: any,
): boolean;
componentWillUpdate(
nextProps: Props,
nextState: State,
nextContext: any,
): mixed;
UNSAFE_componentWillUpdate(
nextProps: Props,
nextState: State,
nextContext: any,
): mixed;
componentDidUpdate(
prevProps: Props,
prevState: State,
prevContext: any,
): mixed;
componentWillUnmount(): mixed;
componentDidCatch(
error: Error,
info: { componentStack: string, ... }
): mixed;
// long tail of other stuff not modeled very well
refs: any;
context: any;
getChildContext(): any;
static displayName?: ?string;
static childContextTypes: any;
static contextTypes: any;
static propTypes: any;
// We don't add a type for `defaultProps` so that its type may be entirely
// inferred when we diff the type for `defaultProps` with `Props`. Otherwise
// the user would need to define a type (which would be redundant) to override
// the type we provide here in the base class.
//
// static defaultProps: $Shape<Props>;
}
declare class React$PureComponent<Props, State = void>
extends React$Component<Props, State> {
}
declare type React$AbstractComponentStatics = {
displayName?: ?string,
// This is only on function components, but trying to access name when
// displayName is undefined is a common pattern.
name?: ?string,
propTypes?: {[string] : any, ...},
...
};
/**
* The type of a stateless functional component. In most cases these components
* are a single function. However, they may have some static properties that we
* can type check.
*/
declare type React$StatelessFunctionalComponent<Props> = {
(props: Props, context: any): React$Node,
displayName?: ?string,
propTypes?: any,
contextTypes?: any,
...
};
/**
* The type of a component in React. A React component may be a:
*
* - Stateless functional components. Functions that take in props as an
* argument and return a React node.
* - ES6 class component. Components with state defined using the ES6 class syntax
*/
declare type React$ComponentType<-Config> = React$AbstractComponent<Config, mixed, React$Node>;
/**
* The type of an element in React. A React element may be a:
*
* - String. These elements are intrinsics that depend on the React renderer
* implementation.
* - React component. See `ComponentType` for more information about its
* different variants.
*/
declare type React$ElementType =
| string
| React$AbstractComponent<empty, mixed, React$Node>;
/**
* Type of a React element. React elements are commonly created using JSX
* literals, which desugar to React.createElement calls (see below).
*/
declare type React$Element<+ElementType: React$ElementType, +P = React$ElementProps<ElementType>> = {|
+type: ElementType,
+props: P,
+key: React$Key | null,
+ref: any,
|};
declare type React$MixedElement = React$Element<React$ElementType>;
/**
* The type of the key that React uses to determine where items in a new list
* have moved.
*/
declare type React$Key = string | number;
/**
* The type of the ref prop available on all React components.
*/
declare type React$Ref<ElementType: React$ElementType> =
| { -current: React$ElementRef<ElementType> | null, ... }
| ((React$ElementRef<ElementType> | null) => mixed)
| number | string;
/**
* The type of a React Context. React Contexts are created by calling
* createContext() with a default value.
*/
declare type React$Context<T> = {
Provider: React$ComponentType<{
+value: T,
+children?: React$Node,
...
}>,
Consumer: React$ComponentType<{ +children: (value: T) => ?React$Node, ... }>,
// Optional, user-specified value for custom display label in React DevTools.
displayName?: string,
...
}
/**
* A React portal node. The implementation of the portal node is hidden to React
* users so we use an opaque type.
*/
declare opaque type React$Portal;
declare type React$FragmentType = ({ +children?: React$Node, ... }) => React$Node;
declare module react {
declare export var DOM: any;
declare export var version: string;
declare export function checkPropTypes<V>(
propTypes : any,
values: V,
location: string,
componentName: string,
getStack: ?(() => ?string)
) : void;
declare export var createClass: React$CreateClass;
declare export function createContext<T>(
defaultValue: T,
calculateChangedBits: ?(a: T, b: T) => number,
): React$Context<T>;
declare export var createElement: React$CreateElement;
declare export var cloneElement: React$CloneElement;
declare export function createFactory<ElementType: React$ElementType>(
type: ElementType,
): React$ElementFactory<ElementType>;
declare export function createRef<T>(
): {|current: null | T|};
declare export function isValidElement(element: any): boolean;
declare export var Component: typeof React$Component;
declare export var PureComponent: typeof React$PureComponent;
declare export type StatelessFunctionalComponent<P> =
React$StatelessFunctionalComponent<P>;
declare export type ComponentType<-P> = React$ComponentType<P>;
declare export type AbstractComponent<
-Config,
+Instance = mixed,
+Renders: React$Node = React$Node,
> = React$AbstractComponent<Config, Instance, Renders>;
declare export type MixedElement = React$MixedElement;
declare export type ElementType = React$ElementType;
declare export type Element<+C, +P = React$ElementProps<C>> = React$Element<C, P>;
declare export var Fragment: React$FragmentType;
declare export type Key = React$Key;
declare export type Ref<C> = React$Ref<C>;
declare export type Node = React$Node;
declare export type Context<T> = React$Context<T>;
declare export type Portal = React$Portal;
declare export var ConcurrentMode: ({ +children?: React$Node, ... }) => React$Node; // 16.7+
declare export var StrictMode: ({ +children?: React$Node, ... }) => React$Node;
declare export var Suspense: React$ComponentType<{
+children?: React$Node,
+fallback?: React$Node,
...
}>; // 16.6+
declare export type ElementProps<C> = React$ElementProps<C>;
declare export type ElementConfig<C> = React$ElementConfig<C>;
declare export type ElementRef<C> = React$ElementRef<C>;
declare export type Config<Props, DefaultProps> = React$Config<Props, DefaultProps>;
declare export type ChildrenArray<+T> = $ReadOnlyArray<ChildrenArray<T>> | T;
declare export var Children: {
map<T, U, This>(
children: ChildrenArray<T>,
fn: (this : This, child: $NonMaybeType<T>, index: number) => U,
thisArg: This,
): Array<$NonMaybeType<U>>,
forEach<T, This>(
children: ChildrenArray<T>,
fn: (this : This, child: T, index: number) => mixed,
thisArg: This,
): void,
count(children: ChildrenArray<any>): number,
only<T>(children: ChildrenArray<T>): $NonMaybeType<T>,
toArray<T>(children: ChildrenArray<T>): Array<$NonMaybeType<T>>,
...
};
declare export function forwardRef<Config, Instance>(
render: (
props: Config,
ref: { current: null | Instance, ... } | ((null | Instance) => mixed),
) => React$Node,
): React$AbstractComponent<Config, Instance, React$Node>;
declare export function memo<Config, Instance = mixed>(
component: React$AbstractComponent<Config, Instance, React$Node>,
equal?: (Config, Config) => boolean,
): React$AbstractComponent<Config, Instance, React$Node>;
declare export function lazy<Config, Instance = mixed>(
component: () => Promise<{ default: React$AbstractComponent<Config, Instance, React$Node>, ... }>,
): React$AbstractComponent<Config, Instance, React$Node>;
declare type MaybeCleanUpFn = void | (() => void);
declare export type ReactSetStateFunction<S> = ((S => S) | S) => void;
declare export function useContext<T>(context: React$Context<T>): T;
declare export function useState<S>(
initialState: (() => S) | S,
): [S, ReactSetStateFunction<S>];
declare type Dispatch<A> = (A) => void;
declare export function useReducer<S, A>(
reducer: (S, A) => S,
initialState: S,
): [S, Dispatch<A>];
declare export function useReducer<S, A>(
reducer: (S, A) => S,
initialState: S,
init: void,
): [S, Dispatch<A>];
declare export function useReducer<S, A, I>(
reducer: (S, A) => S,
initialArg: I,
init: (I) => S,
): [S, Dispatch<A>];
declare export function useRef<T>(initialValue: T): {|current: T|};
declare export function useDebugValue(value: any): void;
declare export function useEffect(
create: () => MaybeCleanUpFn,
inputs?: ?$ReadOnlyArray<mixed>,
): void;
declare export function useLayoutEffect(
create: () => MaybeCleanUpFn,
inputs?: ?$ReadOnlyArray<mixed>,
): void;
declare export function useCallback<T: (...args: $ReadOnlyArray<empty>) => mixed>(
callback: T,
inputs: ?$ReadOnlyArray<mixed>,
): T;
declare export function useMemo<T>(
create: () => T,
inputs: ?$ReadOnlyArray<mixed>,
): T;
declare export function useImperativeHandle<T>(
ref: { current: T | null, ... } | ((inst: T | null) => mixed) | null | void,
create: () => T,
inputs: ?$ReadOnlyArray<mixed>,
): void;
declare export function useDeferredValue<T>(value: T): T;
declare export function useTransition(): [boolean, (() => void) => void];
declare export function startTransition(() => void): void;
declare export function useId(): string;
declare export function useInsertionEffect(
create: () => MaybeCleanUpFn,
inputs?: ?$ReadOnlyArray<mixed>,
): void;
declare export function useSyncExternalStore<Snapshot>(
subscribe: (onStoreChange: () => void) => () => void,
getSnapshot: () => Snapshot,
getServerSnapshot?: () => Snapshot,
): Snapshot;
declare export type Interaction = {
name: string,
timestamp: number,
...
};
declare type ProfilerOnRenderFnType = (
id: string,
phase: "mount" | "update",
actualDuration: number,
baseDuration: number,
startTime: number,
commitTime: number,
interactions: Set<Interaction>,
) => void;
declare export var Profiler: React$AbstractComponent<{|
+children?: React$Node,
+id: string,
+onRender: ProfilerOnRenderFnType,
|}, void, React$Node>;
declare type TimeoutConfig = {|
timeoutMs: number,
|};
declare export default {
+DOM: typeof DOM,
+version: typeof version,
+checkPropTypes: typeof checkPropTypes,
+memo: typeof memo,
+lazy: typeof lazy,
+createClass: typeof createClass,
+createContext: typeof createContext,
+createElement: typeof createElement,
+cloneElement: typeof cloneElement,
+createFactory: typeof createFactory,
+createRef: typeof createRef,
+forwardRef: typeof forwardRef,
+isValidElement: typeof isValidElement,
+Component: typeof Component,
+PureComponent: typeof PureComponent,
+Fragment: React$FragmentType,
+Children: typeof Children,
+ConcurrentMode: typeof ConcurrentMode,
+StrictMode: typeof StrictMode,
+Profiler: typeof Profiler,
+Suspense: typeof Suspense,
+useContext: typeof useContext,
+useState: typeof useState,
+useReducer: typeof useReducer,
+useRef: typeof useRef,
+useEffect: typeof useEffect,
+useLayoutEffect: typeof useLayoutEffect,
+useCallback: typeof useCallback,
+useMemo: typeof useMemo,
+useImperativeHandle: typeof useImperativeHandle,
+useTransition: typeof useTransition,
+useDeferredValue: typeof useDeferredValue,
+startTransition: typeof startTransition,
+useId: typeof useId,
+useInsertionEffect: typeof useInsertionEffect,
+useSyncExternalStore: typeof useSyncExternalStore,
...
};
}
// TODO Delete this once https://github.com/facebook/react/pull/3031 lands
// and "react" becomes the standard name for this module
declare module React {
declare module.exports: $Exports<'react'>;
}