children: ReactNode[]): DetailedReactHTMLElement; * value around similar to how youd use instance fields in classes. * `useRef` returns a mutable ref object whose `.current` property is initialized to the passed argument element: ReactElement, * Avoid introducing any side-effects or subscriptions in this method. * render () { // The identity check is done with the SameValue algorithm (Object.is), which is stricter than === */ (error: Error, errorInfo: ErrorInfo): void; */ // Just "P extends { ref? pointerId: number; } locale: string; function useRef(initialValue: T|null): RefObject; * // tslint:disable-next-line:no-empty-interface * has changed. * @version experimental // tslint:disable-next-line:no-empty-interface * const Ctx = React.createContext(0) (prevProps: Readonly, , prevState: Readonly): SS | null; /** } /** getModifierState(key: string): boolean; displayName? : ValidationMap; // TODO (TypeScript 3.0): unstable_observedBits? function createRef(): RefObject; (props? type ReactText = string | number; } preventDefault(): void; * Note that `useRef()` is useful for more than the `ref` attribute. interface ChangeEvent extends SyntheticEvent { getSnapshotBeforeUpdate? * `useRef` returns a mutable ref object whose `.current` property is initialized to the passed argument * props or states have changed. : Partial; * return <>My context's value: {this.context}>; : number; } isPrimary: boolean; const version: string; } * preventDefault(): void; } } // tslint won't let me format the sample code in a way that vscode likes it :( (): void; key: Key | null; * Calling `Component#setState` generally does not trigger this method. * @version experimental ? * // DOM Elements * Note: the presence of getSnapshotBeforeUpdate or getDerivedStateFromProps }; // ---------------------------------------------------------------------- : any); persist(): void; interface ReactSVGElement extends DOMElement, SVGElement> { P extends { ref? target: EventTarget & T; } */ PropsWithoutRef>; interface AnimationEvent extends SyntheticEvent { */ }; children: ReactNode[]): ReactElement; } Perform any necessary cleanup in this method, such as interface ComponentSpec extends Mixin { * to `createElement`, which is no longer necessary due to intersection function memo>( : ValidationMap; * If using the new style context, re-declare this in your class to be the // based on the code in https://github.com/facebook/react/pull/13968 /** * Note: You cannot call `Component#setState` here. * } * longer be considered 'stateless'. metaKey: boolean; propTypes? * target - a reference to the element from which the event was originally dispatched. interface CompositionEvent extends SyntheticEvent { * interface KeyboardEvent extends SyntheticEvent { Consumer: Consumer; // Event Handler Types repeat: boolean; readonly _result: T; Consumer: Consumer; interface CompositionEvent extends SyntheticEvent { * fallback: NonNullable|null; * @see https://reactjs.org/docs/hooks-reference.html#uselayouteffect metaKey: boolean; ? * /** * https://reactjs.org/docs/refs-and-the-dom.html#legacy-api-string-refs type FormEventHandler = EventHandler>; // I tried looking at the code but I have no idea what it does. props? * @see https://reactjs.org/docs/hooks-reference.html#usecontext type KeyboardEventHandler = EventHandler>; * target - a reference to the element from which the event was originally dispatched. element: DetailedReactHTMLElement, * Called immediately before mounting occurs, and before `Component#render`. function useRef(initialValue: T|null): RefObject; // TODO (TypeScript 3.0): unknown * updates because you can pass `dispatch` down instead of callbacks. element: ReactSVGElement, (nextProps: Readonly, nextState: Readonly, nextContext: any): void; const version: string; type WheelEventHandler = EventHandler>; * React may call this even if props have not changed, so be sure to compare new and existing /** * See [DOM Level 3 Events spec](https://www.w3.org/TR/uievents-key/#keys-modifier). /** Ensures that the props do not include ref at all */ */ constructor(props: Readonly); * value around similar to how youd use instance fields in classes. interface LazyExoticComponent> extends ExoticComponent> { childContextTypes? // TODO (TypeScript 3.0): ReadonlyArray * type EffectCallback = () => (void | (() => void)); readonly _result: T; bubbles: boolean; * * @see https://reactjs.org/blog/2018/03/27/update-on-async-rendering.html#updating-state-based-on-props replaceState(nextState: S, callback? */ ): NamedExoticComponent; // property is not available on `P` by default, even though you can /** * This might be a child element to the element on which the event listener is registered. : ValidationMap; (): P; constructor(props: Readonly); class PureComponent extends Component { } */ constructor(props: P, context? new (props: P, context? [key: string]: ReactInstance : ValidationMap; } preventDefault(): void; : WeakValidationMap; displayName? } // * @version experimental interface Mixin extends ComponentLifecycle { nativeEvent: E; clipboardData: DataTransfer; * @see https://reactjs.org/blog/2018/03/27/update-on-async-rendering.html#gradual-migration-path * @deprecated if used without a type annotation, or without static contextType 'ref' extends keyof P * @see https://reactjs.org/docs/hooks-reference.html#useref type ComponentPropsWithoutRef = Setting state here will trigger re-rendering. // will show `ForwardRef(${Component.displayName || Component.name})` in devtools by default, */ stopPropagation(): void; : P, : ReactNode; * type TransitionEventHandler = EventHandler>; /** repeat: boolean; * prevents this from being invoked. shiftKey: boolean; propTypes? * currentTarget - a reference to the element on which the event listener is registered. type PropsWithoutRef = view: AbstractView; data: string; } * Not called for the initial render. interface UIEvent extends SyntheticEvent { cancelable: boolean; relatedTarget: EventTarget; : React.ContextType interface NewLifecycle { type MouseEventHandler = EventHandler>; * @see https://reactjs.org/blog/2018/03/27/update-on-async-rendering.html#gradual-migration-path current: T; /** // ---------------------------------------------------------------------- (error: any) => Partial | null; displayName? componentWillReceiveProps? /** ? * * of the generic argument. * @see https://reactjs.org/blog/2018/03/27/update-on-async-rendering.html#reading-dom-properties-before-an-update * `createElement` or a factory, use `ClassAttributes`: interface TouchEvent extends SyntheticEvent { interface FocusEvent extends SyntheticEvent { propTypes? type Provider = ProviderExoticComponent>; children: ReactNode[]): ReactHTMLElement; // as React will _not_ call the deprecated lifecycle methods if any of the new lifecycle contextTypes? touches: TouchList; interface ConsumerProps { */ : Partial; * @see https://reactjs.org/blog/2018/03/27/update-on-async-rendering.html#reading-dom-properties-before-an-update contextTypes? interface FormEvent extends SyntheticEvent { relatedTarget: EventTarget; Async effects need to call an async function inside * of the generic argument. * prevents this from being invoked. */ elapsedTime: number; : ClassAttributes & P | null, /** type StatelessComponent = FunctionComponent; * Note: its presence prevents any of the deprecated lifecycle methods from being invoked } componentWillUpdate? : infer R } ? /** tiltY: number; location: number; UNSAFE_componentWillReceiveProps? deltaZ: number; // TODO (TypeScript 3.0): unknown> function createElement, C extends ComponentClass>( * `createElement` or a factory, use `ClassAttributes`: * @deprecated 16.3, use static getDerivedStateFromProps instead; will stop working in React 17 type ClipboardEventHandler = EventHandler>; * Catches exceptions generated in descendant components. // always pass children as variadic arguments to `createElement`. interface ClassicComponentClass extends ComponentClass { // This will technically work if you give a Consumer or Provider but it's deprecated and warns (props: P & { children? * `createElement` or a factory, use `ClassAttributes`: props? componentWillUnmount? // // tslint:disable-next-line:no-empty-interface interface UIEvent extends SyntheticEvent { * Returns a stateful value, and a function to update it. } */ : SS): void; /** function createElement, T extends HTMLElement>( } * (): void; displayName? elapsedTime: number; type ClassicFactory = CFactory>; } children: ReactNode; UNSAFE_componentWillMount? * Catches exceptions generated in descendant components. string extends R * @see https://reactjs.org/blog/2018/03/27/update-on-async-rendering.html#reading-dom-properties-before-an-update * @see https://reactjs.org/blog/2018/03/27/update-on-async-rendering.html#gradual-migration-path /** * It receives the error that was thrown as a parameter and should return a value to update state. deltaMode: number; repeat: boolean; * updates because you can pass `dispatch` down instead of callbacks. data: string; // interface ProviderProps { // ---------------------------------------------------------------------- type ComponentProps = interface KeyboardEvent extends SyntheticEvent { pageY: number; // but can be given its own specific name timeStamp: number; */ function useImperativeMethods(ref: Ref|undefined, init: () => R, inputs? props? // TODO (TypeScript 3.0): ReadonlyArray * @see https://reactjs.org/docs/hooks-reference.html#useref * tiltY: number; * `createElement` or a factory, use `ClassAttributes`: : Partial; type UIEventHandler = EventHandler>; * @see https://reactjs.org/docs/hooks-reference.html#usestate // TODO: change any to unknown when moving to TS v3 interface ChangeEvent extends SyntheticEvent { (prevProps: Readonly, prevState: Readonly, snapshot? * const expensiveResult = useMemo(expensive, [expensive]) * return } * * @version experimental // Just "P extends { ref? * See [DOM Level 3 Events spec](https://www.w3.org/TR/uievents-key/#keys-modifier). ): void; /** * The snapshot is only present if getSnapshotBeforeUpdate is present and returns non-null. * @version experimental * `createElement` or a factory, use `ClassAttributes`: */ * @deprecated as of recent React versions, function components can no isPropagationStopped(): boolean; } * function createRef(): RefObject; : infer R }" looks sufficient, but R will infer as {} if P is {}. element: DOMElement, * Called immediately after a component is mounted. * Note: You cannot call `Component#setState` here. // This will technically work if you give a Consumer or Provider but it's deprecated and warns type DragEventHandler = EventHandler>; * See [DOM Level 3 Events spec](https://www.w3.org/TR/uievents-key/#keys-modifier). The next version published with hooks will warn if you actually string extends R interface PointerEvent extends MouseEvent { // NOTE: Currently, in alpha.0, the effect callbacks are actually allowed to return anything, * * React may call this even if props have not changed, so be sure to compare new and existing * `useImperativeMethods` should be used with `React.forwardRef`. function createFactory, T extends Element>( * : Array>; : Partial; Updates scheduled inside // Event Handler Types shouldComponentUpdate? * ```ts // TODO (TypeScript 3.0): unknown> const StrictMode: ExoticComponent; /** Ensures that the props do not include ref at all */ (): S; * */ type KeyboardEventHandler = EventHandler>; /** // this technically does accept a second argument, but it's already under a deprecation warning (nextProps: Readonly, nextState: Readonly, nextContext: any): void; * See the [DOM Level 3 Events spec](https://www.w3.org/TR/uievents-key/#named-key-attribute-values). * If set, `this.context` will be set at runtime to the current value of the given Context. width: number; propTypes? interface FocusEvent extends SyntheticEvent { interface StaticLifecycle { * : P, type ReactText = string | number; : InputIdentityList): void; children: ReactNode[]): ReactHTMLElement; * /** /** (props: P & { children? } * Usage note: if you need the result of useRef to be directly mutable, include `| null` in the type getDerivedStateFromError? elapsedTime: number; : ClassAttributes & P | null, : any): ReactElement | null; Consumer: Consumer; propertyName: string; * @see https://reactjs.org/docs/hooks-reference.html#usecontext /** targetTouches: TouchList; interface WheelEvent extends MouseEvent { */ // However, we have no way of telling the JSX parser that it's a JSX element type or its props other than /** * Runs before React applies the result of `render` to the document, and * static contextType = Ctx Please use `FunctionComponent` instead. // We MUST keep setState() as a unified signature because it allows proper checking of the method return type. altKey: boolean; * static contextType = Ctx deltaY: number; interface PointerEvent extends MouseEvent { preventDefault(): void; interface SuspenseProps { function cloneElement( : Partial; * `componentDidMount` and `componentDidUpdate`. * `useCallback` will return a memoized version of the callback that only changes if one of the `inputs` * ``` : PropsWithRef>; * This lifecycle is invoked after an error has been thrown by a descendant component. interface MutableRefObject { width: number; * @see https://reactjs.org/blog/2018/03/27/update-on-async-rendering.html#gradual-migration-path * type: keyof ReactHTML): HTMLFactory; children? : InputIdentityList): void; */ * prevents this from being invoked. * Avoid introducing any side-effects or subscriptions in this method. } charCode: number; * Note: the presence of getSnapshotBeforeUpdate or getDerivedStateFromProps (): void; target: T; * and `componentDidUpdate` will not be called. * const expensiveResult = useMemo(expensive, [expensive]) /** /** */ } factory: () => Promise * Avoid introducing any side-effects or subscriptions in this method. Component: SFC, detail: number; children: ReactNode[]): DOMElement; // Context via RenderProps getModifierState(key: string): boolean; * The signature is identical to `useEffect`, but it fires synchronously after all DOM mutations. * Calling `Component#setState` generally does not trigger this method. type TransitionEventHandler = EventHandler>; * a single argument, which is useful for many top-level API defs. : ClassAttributes & P | null, interface ClassicComponent extends Component { function cloneElement, T extends HTMLElement>( */ * NOTE: prefer ComponentPropsWithRef, if the ref is forwarded, const Fragment: ExoticComponent; : string; : WeakValidationMap; * We use an intersection type to infer multiple type parameters from interface LazyExoticComponent> extends ExoticComponent> { : P; } // property is not available on `P` by default, even though you can location: number; ? setState( setState( * locale: string; */ * Called immediately after updating occurs. * type MyContext = number : {}; Unhandled exceptions will cause * updates because you can pass `dispatch` down instead of callbacks. * Note: the presence of getSnapshotBeforeUpdate or getDerivedStateFromProps } pageX: number; * (`initialValue`). /** ): NamedExoticComponent; displayName? // This should actually be something like `Lifecycle | DeprecatedLifecycle`, // Unlike redux, the actions _can_ be anything dataTransfer: DataTransfer; PropsWithoutRef>; * Not implemented yet, requires unstable_ConcurrentMode /** contextTypes? * React may call this even if props have not changed, so be sure to compare new and existing isPropagationStopped(): boolean; pageX: number; dataTransfer: DataTransfer; This was used to allow clients to pass `ref` and `key` string extends R interface MemoExoticComponent> extends NamedExoticComponent> { * @param effect Imperative function that can return a cleanup function */ : SS): void; } // Unlike the class component setState, the updates are not allowed to be partial * Note: the presence of getSnapshotBeforeUpdate or getDerivedStateFromProps interface KeyboardEvent extends SyntheticEvent { width: number; preventDefault(): void; : Partial & Attributes, // TODO (TypeScript 3.0): interface DragEvent extends MouseEvent { (): P; // will show `Memo(${Component.displayName || Component.name})` in devtools by default, // and it's not even released so probably better to not define it. : ValidationMap; : number; type TransitionEventHandler = EventHandler>; * (`initialValue`). [propertyName: string]: any; * } : any): ReactElement | null; interface ComponentLifecycle extends NewLifecycle, DeprecatedLifecycle { * We use an intersection type to infer multiple type parameters from */ * type FocusEventHandler = EventHandler>; screenX: number; * * or ComponentPropsWithoutRef when refs are not supported. * contextTypes? propTypes? /** props? interface ComponentSpec extends Mixin { * ``` for a list of valid (case-sensitive) arguments to this method. type ReactEventHandler = EventHandler>; /** * getModifierState(key: string): boolean; Setting state here will trigger re-rendering. * or ComponentPropsWithoutRef when refs are not supported. * type ComponentPropsWithRef = : { : ReactNode }, ref: Ref | null): ReactElement | null; type ReactInstance = Component | Element; * // SVGElement ? * to `createElement`, which is no longer necessary due to intersection Async effects need to call an async function inside deltaX: number; * @see https://reactjs.org/docs/hooks-reference.html#usereducer type Reducer = (prevState: S, action: A) => S; // TODO (TypeScript 3.0): unknown> * shiftKey: boolean; interface ComponentClass extends StaticLifecycle { * **NOTE**: Exotic components are not callable. getInitialState? // Unlike the class component setState, the updates are not allowed to be partial * pointerId: number; interface FocusEvent extends SyntheticEvent { propsAreEqual? type: keyof ReactHTML, }; * Called to determine whether the change in props and state should trigger a re-render. } */ * @see https://reactjs.org/docs/hooks-reference.html#usecallback type ReactInstance = Component | Element; */ : () => void): void; [key: string]: ReactInstance defaultProps? */ pointerType: 'mouse' | 'pen' | 'touch'; (nextProps: Readonly, nextContext: any): void; * If using the new style context, re-declare this in your class to be the : any): Component; */ [propertyName: string]: any; type: ClassType, ClassicComponentClass>, : WeakValidationMap; interface CompositionEvent extends SyntheticEvent { * pointerType: 'mouse' | 'pen' | 'touch'; childContextTypes? P (nextProps: Readonly, nextState: Readonly, nextContext: any): boolean;
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