buggy types rollup

index.d.ts

/// <reference types="react" />
import { ComponentClass } from 'react';
import * as CSS from 'csstype';
import * as PropTypes from 'prop-types';
import React from 'react';

declare interface AbstractAction {
    type: string;
    meta: {
        counter: number;
        [meta: string]: any;
    };
}

declare interface AbstractState<T> {
    initialValue?: T | Error;
    counter: number;
    promise: Promise<T>;
    run: (...args: any[]) => void;
    reload: () => void;
    cancel: () => void;
    setData: (data: T, callback?: () => void) => T;
    setError: (error: Error, callback?: () => void) => Error;
}

export declare enum actionTypes {
    start = "start",
    cancel = "cancel",
    fulfill = "fulfill",
    reject = "reject"
}

declare class Async_2<T> extends React.Component<AsyncProps<T>, AsyncState<T>> {
}

declare type AsyncAction<T> = Start | Cancel | Fulfill<T> | Reject;

declare type AsyncChildren<T> = ((state: AsyncState<T>) => React.ReactNode) | React.ReactNode;

declare interface AsyncConstructor<T> extends ComponentClass<AsyncProps<T>> {
    new (): Async_2<T>;
    Initial: React.FC<{
        children?: InitialChildren<T>;
        persist?: boolean;
    }>;
    Pending: React.FC<{
        children?: PendingChildren<T>;
        initial?: boolean;
    }>;
    Loading: React.FC<{
        children?: PendingChildren<T>;
        initial?: boolean;
    }>;
    Fulfilled: React.FC<{
        children?: FulfilledChildren<T>;
        persist?: boolean;
    }>;
    Resolved: React.FC<{
        children?: FulfilledChildren<T>;
        persist?: boolean;
    }>;
    Rejected: React.FC<{
        children?: RejectedChildren<T>;
        persist?: boolean;
    }>;
    Settled: React.FC<{
        children?: SettledChildren<T>;
        persist?: boolean;
    }>;
}

declare type AsyncFulfilled<T, S = AbstractState<T>> = S & {
    data: T;
    error: undefined;
    value: T;
    startedAt: Date;
    finishedAt: Date;
    status: "fulfilled";
    isInitial: false;
    isPending: false;
    isLoading: false;
    isFulfilled: true;
    isResolved: true;
    isRejected: false;
    isSettled: true;
};

declare type AsyncInitial<T, S = AbstractState<T>> = S & {
    initialValue?: undefined;
    data: undefined;
    error: undefined;
    value: undefined;
    startedAt: undefined;
    finishedAt: undefined;
    status: "initial";
    isInitial: false;
    isPending: false;
    isLoading: false;
    isFulfilled: false;
    isResolved: false;
    isRejected: false;
    isSettled: false;
};

declare interface AsyncOptions<T> {
    promise?: Promise<T>;
    promiseFn?: PromiseFn<T>;
    deferFn?: DeferFn<T>;
    watch?: any;
    watchFn?: (props: AsyncProps<T>, prevProps: AsyncProps<T>) => any;
    initialValue?: T;
    onResolve?: (data: T) => void;
    onReject?: (error: Error) => void;
    reducer?: (state: AsyncState<T>, action: AsyncAction<T>, internalReducer: (state: AsyncState<T>, action: AsyncAction<T>) => AsyncState<T>) => AsyncState<T>;
    dispatcher?: (action: AsyncAction<T>, internalDispatch: (action: AsyncAction<T>) => void, props: AsyncProps<T>) => void;
    debugLabel?: string;
    [prop: string]: any;
}

declare type AsyncPending<T, S = AbstractState<T>> = S & {
    data: T | undefined;
    error: Error | undefined;
    value: T | Error | undefined;
    startedAt: Date;
    finishedAt: undefined;
    status: "pending";
    isInitial: false;
    isPending: true;
    isLoading: true;
    isFulfilled: false;
    isResolved: false;
    isRejected: false;
    isSettled: false;
};

declare interface AsyncProps<T> extends AsyncOptions<T> {
    children?: AsyncChildren<T>;
}

declare type AsyncRejected<T, S = AbstractState<T>> = S & {
    data: T | undefined;
    error: Error;
    value: Error;
    startedAt: Date;
    finishedAt: Date;
    status: "rejected";
    isInitial: false;
    isPending: false;
    isLoading: false;
    isFulfilled: false;
    isResolved: false;
    isRejected: true;
    isSettled: true;
};

declare type AsyncState<T, S extends AbstractState<T> = AbstractState<T>> = AsyncInitial<T, S> | AsyncPending<T, S> | AsyncFulfilled<T, S> | AsyncRejected<T, S>;

declare type Cancel = AbstractAction & {
    type: "cancel";
};

/**
 * createInstance allows you to create instances of Async that are bound to a specific promise.
 * A unique instance also uses its own React context for better nesting capability.
 */
export declare const createInstance: <T extends {}>(defaultProps?: AsyncProps<T>, displayName?: string) => AsyncConstructor<T>;

declare const _default: AsyncConstructor<{}>;
export { _default as Async }
export default _default;

declare type DeferFn<T> = (args: any[], props: AsyncProps<T>, controller: AbortController) => Promise<T>;

export declare const dispatchMiddleware: <T>(dispatch: (action: AsyncAction<T>, ...args: any[]) => void) => (action: AsyncAction<T>, ...args: unknown[]) => void;

declare interface FetchOptions<T> extends AsyncOptions<T> {
    defer?: boolean;
    json?: boolean;
}

declare interface FetchRun<T> extends Omit<AbstractState<T>, "run"> {
    run(overrideInit: (init: RequestInit) => RequestInit): void;
    run(overrideInit: Partial<RequestInit>): void;
    run(ignoredEvent: React_2.SyntheticEvent): void;
    run(ignoredEvent: Event): void;
    run(): void;
}

declare type Fulfill<T> = AbstractAction & {
    type: "fulfill";
    payload: T;
};

declare type FulfilledChildren<T> = ((data: T, state: AsyncFulfilled<T>) => React.ReactNode) | React.ReactNode;

/**
 * Universal global scope object. In the browser this is `self`, in Node.js and React Native it's `global`.
 * This file is excluded from coverage reporting because these globals are environment-specific so we can't test them all.
 */
export declare const globalScope: {
    __REACT_ASYNC__?: any;
    AbortController?: {
        new (): AbortController;
        prototype: AbortController;
    } | undefined;
    fetch: (input: RequestInfo, init?: RequestInit | undefined) => Promise<Response>;
};

/**
 * Renders only when promise is resolved.
 *
 * @prop {Function|Node} children Function (passing data and state) or React node
 * @prop {Object} state React Async state object
 * @prop {boolean} persist Show old data while pending (promise is loading)
 */
export declare const IfFulfilled: {
    <T extends {}>({ children, persist, state, }: {
        children?: FulfilledChildren<T>;
        persist?: boolean | undefined;
        state: AsyncState<T, import("./Async").AbstractState<T>>;
    }): JSX.Element;
    propTypes: {
        children: any;
        state: any;
        persist: any;
    };
};

/**
 * Renders only when no promise has started or completed yet.
 *
 * @prop {Function|Node} children Function (passing state) or React node
 * @prop {Object} state React Async state object
 * @prop {boolean} persist Show until we have data, even while pending (loading) or when an error occurred
 */
export declare const IfInitial: {
    <T extends {}>({ children, persist, state, }: {
        children?: InitialChildren<T>;
        persist?: boolean | undefined;
        state: AsyncState<T, import("./Async").AbstractState<T>>;
    }): JSX.Element;
    propTypes: {
        children: any;
        state: any;
        persist: any;
    };
};

/**
 * Renders only while pending (promise is loading).
 *
 * @prop {Function|Node} children Function (passing state) or React node
 * @prop {Object} state React Async state object
 * @prop {boolean} initial Show only on initial load (data is undefined)
 */
export declare const IfPending: {
    <T extends {}>({ children, initial, state, }: {
        children?: PendingChildren<T>;
        initial?: boolean | undefined;
        state: AsyncState<T, import("./Async").AbstractState<T>>;
    }): JSX.Element;
    propTypes: {
        children: any;
        state: any;
        initial: any;
    };
};

/**
 * Renders only when promise is rejected.
 *
 * @prop {Function|Node} children Function (passing error and state) or React node
 * @prop {Object} state React Async state object
 * @prop {boolean} persist Show old error while pending (promise is loading)
 */
export declare const IfRejected: {
    <T extends {}>({ children, persist, state, }: {
        children?: RejectedChildren<T>;
        persist?: boolean | undefined;
        state: AsyncState<T, import("./Async").AbstractState<T>>;
    }): JSX.Element;
    propTypes: {
        children: any;
        state: any;
        persist: any;
    };
};

/**
 * Renders only when promise is fulfilled or rejected.
 *
 * @prop {Function|Node} children Function (passing state) or React node
 * @prop {Object} state React Async state object
 * @prop {boolean} persist Show old data or error while pending (promise is loading)
 */
export declare const IfSettled: {
    <T extends {}>({ children, persist, state, }: {
        children?: SettledChildren<T>;
        persist?: boolean | undefined;
        state: AsyncState<T, import("./Async").AbstractState<T>>;
    }): JSX.Element;
    propTypes: {
        children: any;
        state: any;
        persist: any;
    };
};

export declare const init: <T>({ initialValue, promise, promiseFn, }: {
    initialValue?: Error | T | undefined;
    promise?: Promise<T> | undefined;
    promiseFn?: PromiseFn<T> | undefined;
}) => AsyncState<T, import("./Async").AbstractState<T>>;

declare type InitialChildren<T> = ((state: AsyncInitial<T>) => React.ReactNode) | React.ReactNode;

declare type NativeAnimationEvent = AnimationEvent;

declare type NativeClipboardEvent = ClipboardEvent;

declare type NativeCompositionEvent = CompositionEvent;

declare type NativeDragEvent = DragEvent;

declare type NativeFocusEvent = FocusEvent;

declare type NativeKeyboardEvent = KeyboardEvent;

declare type NativeMouseEvent = MouseEvent;

declare type NativePointerEvent = PointerEvent;

declare type NativeTouchEvent = TouchEvent;

declare type NativeTransitionEvent = TransitionEvent;

declare type NativeUIEvent = UIEvent;

declare type NativeWheelEvent = WheelEvent;

declare type PendingChildren<T> = ((state: AsyncPending<T>) => React.ReactNode) | React.ReactNode;

declare type PromiseFn<T> = (props: AsyncProps<T>, controller: AbortController) => Promise<T>;

declare namespace React_2 {
    //
    // 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 | null)
        | (new (props: P) => Component<P, any>);

    type Key = string | number;

    interface RefObject<T> {
        readonly current: T | null;
    }

    type Ref<T> = { bivarianceHack(instance: T | null): void }["bivarianceHack"] | RefObject<T> | null;
    type LegacyRef<T> = string | Ref<T>;

    type ComponentState = any;

    interface Attributes {
        key?: Key;
    }
    interface RefAttributes<T> extends Attributes {
        ref?: Ref<T>;
    }
    interface ClassAttributes<T> extends Attributes {
        ref?: LegacyRef<T>;
    }

    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, T> { }

    /**
     * @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 } ? R : never : never;
    }

    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>;
    }

    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
    // tslint:disable-next-line:no-empty-interface
    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>;

    // tslint:disable-next-line:no-empty-interface
    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
    // http://facebook.github.io/react/docs/glossary.html
    // ----------------------------------------------------------------------

    type ReactText = string | number;
    type ReactChild = ReactElement | ReactText;

    interface ReactNodeArray extends Array<ReactNode> {}
    type ReactFragment = {} | ReactNodeArray;
    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;
    }

    interface ConsumerProps<T> {
        children: (value: T) => ReactNode;
        unstable_observedBits?: number;
    }

    // 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 SFC 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;
    }

    interface ProviderExoticComponent<P> extends ExoticComponent<P> {
        propTypes?: WeakValidationMap<P>;
    }

    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;
    }
    function createContext<T>(
        defaultValue: T,
        calculateChangedBits?: (prev: T, next: T) => number
    ): Context<T>;

    function isValidElement<P>(object: {} | null | undefined): object is ReactElement<P>;

    const Children: ReactChildren;
    const Fragment: ExoticComponent<{ children?: ReactNode }>;
    const StrictMode: ExoticComponent<{ children?: ReactNode }>;

    interface SuspenseProps {
        children?: ReactNode;

        /** A fallback react tree to show when a Suspense child (like React.lazy) suspends */
        fallback: NonNullable<ReactNode>|null;
    }
    /**
     * 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://github.com/bvaughn/rfcs/blob/profiler/text/0000-profiler.md#detailed-design | API}
     */
    type ProfilerOnRenderCallback = (
        id: string,
        phase: "mount" | "update",
        actualDuration: number,
        baseDuration: number,
        startTime: number,
        commitTime: number,
        interactions: Set<SchedulerInteraction>,
    ) => void;
    interface ProfilerProps {
        children?: ReactNode;
        id: string;
        onRender: ProfilerOnRenderCallback;
    }

    const Profiler: ExoticComponent<ProfilerProps>;

    //
    // Component API
    // ----------------------------------------------------------------------

    type ReactInstance = Component<any> | Element;

    // Base component for plain JS classes
    // tslint:disable-next-line:no-empty-interface
    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://reactjs.org/docs/context.html#classcontexttype
         */
        static contextType?: Context<any>;

        /**
         * If using the new style context, re-declare this in your class to be the
         * `React.ContextType` of your `static contextType`.
         *
         * ```ts
         * static contextType = MyContext
         * context!: React.ContextType<typeof MyContext>
         * ```
         *
         * @deprecated if used without a type annotation, or without static contextType
         * @see https://reactjs.org/docs/legacy-context.html
         */
        // TODO (TypeScript 3.0): unknown
        context: any;

        constructor(props: Readonly<P>);
        /**
         * @deprecated
         * @see https://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 }>;
        state: Readonly<S>;
        /**
         * @deprecated
         * https://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 | null;
        propTypes?: WeakValidationMap<P>;
        contextTypes?: ValidationMap<any>;
        defaultProps?: Partial<P>;
        displayName?: string;
    }

    interface RefForwardingComponent<T, P = {}> {
        (props: PropsWithChildren<P>, ref: Ref<T>): ReactElement | null;
        propTypes?: WeakValidationMap<P>;
        contextTypes?: ValidationMap<any>;
        defaultProps?: Partial<P>;
        displayName?: string;
    }

    interface ComponentClass<P = {}, S = ComponentState> extends StaticLifecycle<P, S> {
        new (props: P, context?: any): Component<P, S>;
        propTypes?: WeakValidationMap<P>;
        contextType?: Context<any>;
        contextTypes?: ValidationMap<any>;
        childContextTypes?: ValidationMap<any>;
        defaultProps?: Partial<P>;
        displayName?: string;
    }

    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>;
        getDerivedStateFromError?: GetDerivedStateFromError<P, S>;
    }

    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://reactjs.org/blog/2018/03/27/update-on-async-rendering.html#initializing-state
         * @see https://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://reactjs.org/blog/2018/03/27/update-on-async-rendering.html#initializing-state
         * @see https://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://reactjs.org/blog/2018/03/27/update-on-async-rendering.html#updating-state-based-on-props
         * @see https://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://reactjs.org/blog/2018/03/27/update-on-async-rendering.html#updating-state-based-on-props
         * @see https://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://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
         */
        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://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
         */
        UNSAFE_componentWillUpdate?(nextProps: Readonly<P>, nextState: Readonly<S>, nextContext: any): void;
    }

    interface Mixin<P, S> extends ComponentLifecycle<P, S> {
        mixins?: Array<Mixin<P, S>>;
        statics?: {
            [key: string]: any;
        };

        displayName?: string;
        propTypes?: ValidationMap<any>;
        contextTypes?: ValidationMap<any>;
        childContextTypes?: ValidationMap<any>;

        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>;
    }

    function forwardRef<T, P = {}>(Component: RefForwardingComponent<T, P>): ForwardRefExoticComponent<PropsWithoutRef<P> & RefAttributes<T>>;

    /** Ensures that the props do not include ref at all */
    type PropsWithoutRef<P> =
        // Just Pick would be sufficient for this, but I'm trying to avoid unnecessary mapping over union types
        // https://github.com/Microsoft/TypeScript/issues/28339
        'ref' extends keyof P
            ? Pick<P, Exclude<keyof P, 'ref'>>
            : 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 }
                ? string extends R
                    ? PropsWithoutRef<P> & { ref?: Exclude<R, string> }
                    : P
                : P
            : P;

    type PropsWithChildren<P> = P & { children?: ReactNode };

    /**
     * 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 ComponentClass<infer P>
            ? PropsWithoutRef<P> & RefAttributes<InstanceType<T>>
            : PropsWithRef<ComponentProps<T>>;
    type ComponentPropsWithoutRef<T extends ElementType> =
        PropsWithoutRef<ComponentProps<T>>;

    // 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: SFC<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;
    // Unlike redux, the actions _can_ be anything
    type Reducer<S, A> = (prevState: S, action: A) => 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 ===
    // TODO (TypeScript 3.0): ReadonlyArray<unknown>
    type DependencyList = ReadonlyArray<any>;

    // NOTE: callbacks are _only_ allowed to return either void, or a destructor.
    // The destructor is itself only allowed to return void.
    type EffectCallback = () => (void | (() => void | undefined));

    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://reactjs.org/docs/hooks-reference.html#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://reactjs.org/docs/hooks-reference.html#usestate
     */
    function useState<S>(initialState: S | (() => S)): [S, Dispatch<SetStateAction<S>>];
    // convenience overload when first argument is ommitted
    /**
     * Returns a stateful value, and a function to update it.
     *
     * @version 16.8.0
     * @see https://reactjs.org/docs/hooks-reference.html#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://reactjs.org/docs/hooks-reference.html#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 ommitted.
    // 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://reactjs.org/docs/hooks-reference.html#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
     * updates because you can pass `dispatch` down instead of callbacks.
     *
     * @version 16.8.0
     * @see https://reactjs.org/docs/hooks-reference.html#usereducer
     */

    // I'm not sure if I keep this 2-ary or if I make it (2,3)-ary; it's currently (2,3)-ary.
    // The Flow types do have an overload for 3-ary invocation with undefined initializer.

    // NOTE: without the ReducerState indirection, TypeScript would reduce S to be the most common
    // supertype between the reducer's return type and the initialState (or the initializer's return type),
    // which would prevent autocompletion from ever working.

    // TODO: double-check if this weird overload logic is necessary. It is possible it's either a bug
    // in older versions, or a regression in newer versions of the typescript completion service.
    function useReducer<R extends Reducer<any, any>>(
        reducer: R,
        initialState: ReducerState<R>,
        initializer?: undefined
    ): [ReducerState<R>, Dispatch<ReducerAction<R>>];
    /**
     * `useRef` returns a mutable ref object whose `.current` property is initialized to the passed argument
     * (`initialValue`). The returned object will persist for the full lifetime of the component.
     *
     * Note that `useRef()` is useful for more than the `ref` attribute. It’s handy for keeping any mutable
     * value around similar to how you’d use instance fields in classes.
     *
     * @version 16.8.0
     * @see https://reactjs.org/docs/hooks-reference.html#useref
     */
    // TODO (TypeScript 3.0): <T extends unknown>
    function useRef<T>(initialValue: T): MutableRefObject<T>;
    // convenience overload for refs given as a ref prop as they typically start with a null value
    /**
     * `useRef` returns a mutable ref object whose `.current` property is initialized to the passed argument
     * (`initialValue`). The returned object will persist for the full lifetime of the component.
     *
     * Note that `useRef()` is useful for more than the `ref` attribute. It’s handy for keeping any mutable
     * value around similar to how you’d use instance fields in classes.
     *
     * Usage note: if you need the result of useRef to be directly mutable, include `| null` in the type
     * of the generic argument.
     *
     * @version 16.8.0
     * @see https://reactjs.org/docs/hooks-reference.html#useref
     */
    // TODO (TypeScript 3.0): <T extends unknown>
    function useRef<T>(initialValue: T|null): RefObject<T>;
    // convenience overload for potentially undefined initialValue / call with 0 arguments
    // has a default to stop it from defaulting to {} instead
    /**
     * `useRef` returns a mutable ref object whose `.current` property is initialized to the passed argument
     * (`initialValue`). The returned object will persist for the full lifetime of the component.
     *
     * Note that `useRef()` is useful for more than the `ref` attribute. It’s handy for keeping any mutable
     * value around similar to how you’d use instance fields in classes.
     *
     * @version 16.8.0
     * @see https://reactjs.org/docs/hooks-reference.html#useref
     */
    // TODO (TypeScript 3.0): <T extends unknown>
    function useRef<T = undefined>(): MutableRefObject<T | undefined>;
    /**
     * The signature is identical to `useEffect`, but it fires synchronously after all DOM mutations.
     * Use this to read layout from the DOM and synchronously re-render. Updates scheduled inside
     * `useLayoutEffect` will be flushed synchronously, before the browser has a chance to paint.
     *
     * Prefer the standard `useEffect` when possible to avoid blocking visual updates.
     *
     * If you’re migrating code from a class component, `useLayoutEffect` fires in the same phase as
     * `componentDidMount` and `componentDidUpdate`.
     *
     * @version 16.8.0
     * @see https://reactjs.org/docs/hooks-reference.html#uselayouteffect
     */
    function useLayoutEffect(effect: EffectCallback, deps?: DependencyList): void;
    /**
     * Accepts a function that contains imperative, possibly effectful code.
     *
     * @param effect Imperative function that can return a cleanup function
     * @param deps If present, effect will only activate if the values in the list change.
     *
     * @version 16.8.0
     * @see https://reactjs.org/docs/hooks-reference.html#useeffect
     */
    function useEffect(effect: EffectCallback, deps?: DependencyList): void;
    // NOTE: this does not accept strings, but this will have to be fixed by removing strings from type Ref<T>
    /**
     * `useImperativeHandle` customizes the instance value that is exposed to parent components when using
     * `ref`. As always, imperative code using refs should be avoided in most cases.
     *
     * `useImperativeHandle` should be used with `React.forwardRef`.
     *
     * @version 16.8.0
     * @see https://reactjs.org/docs/hooks-reference.html#useimperativehandle
     */
    function useImperativeHandle<T, R extends T>(ref: Ref<T>|undefined, init: () => R, deps?: DependencyList): void;
    // I made 'inputs' required here and in useMemo as there's no point to memoizing without the memoization key
    // useCallback(X) is identical to just using X, useMemo(() => Y) is identical to just using Y.
    /**
     * `useCallback` will return a memoized version of the callback that only changes if one of the `inputs`
     * has changed.
     *
     * @version 16.8.0
     * @see https://reactjs.org/docs/hooks-reference.html#usecallback
     */
    // TODO (TypeScript 3.0): <T extends (...args: never[]) => unknown>
    function useCallback<T extends (...args: any[]) => any>(callback: T, deps: DependencyList): T;
    /**
     * `useMemo` will only recompute the memoized value when one of the `deps` has changed.
     *
     * Usage note: if calling `useMemo` with a referentially stable function, also give it as the input in
     * the second argument.
     *
     * ```ts
     * function expensive () { ... }
     *
     * function Component () {
     *   const expensiveResult = useMemo(expensive, [expensive])
     *   return ...
     * }
     * ```
     *
     * @version 16.8.0
     * @see https://reactjs.org/docs/hooks-reference.html#usememo
     */
    // allow undefined, but don't make it optional as that is very likely a mistake
    function useMemo<T>(factory: () => T, deps: DependencyList | undefined): T;
    /**
     * `useDebugValue` can be used to display a label for custom hooks in React DevTools.
     *
     * NOTE: We don’t recommend adding debug values to every custom hook.
     * It’s most valuable for custom hooks that are part of shared libraries.
     *
     * @version 16.8.0
     * @see https://reactjs.org/docs/hooks-reference.html#usedebugvalue
     */
    // the name of the custom hook is itself derived from the function name at runtime:
    // it's just the function name without the "use" prefix.
    function useDebugValue<T>(value: T, format?: (value: T) => any): void;

    //
    // Event System
    // ----------------------------------------------------------------------
    // TODO: change any to unknown when moving to TS v3
    interface BaseSyntheticEvent<E = object, C = any, T = any> {
        nativeEvent: E;
        currentTarget: C;
        target: T;
        bubbles: boolean;
        cancelable: boolean;
        defaultPrevented: boolean;
        eventPhase: number;
        isTrusted: boolean;
        preventDefault(): void;
        isDefaultPrevented(): boolean;
        stopPropagation(): void;
        isPropagationStopped(): boolean;
        persist(): void;
        timeStamp: number;
        type: string;
    }

    /**
     * currentTarget - a reference to the element on which the event listener is registered.
     *
     * target - a reference to the element from which the event was originally dispatched.
     * This might be a child element to the element on which the event listener is registered.
     * If you thought this should be `EventTarget & T`, see https://github.com/DefinitelyTyped/DefinitelyTyped/pull/12239
     */
    interface SyntheticEvent<T = Element, E = Event> extends BaseSyntheticEvent<E, EventTarget & T, EventTarget> {}

    interface ClipboardEvent<T = Element> extends SyntheticEvent<T, NativeClipboardEvent> {
        clipboardData: DataTransfer;
    }

    interface CompositionEvent<T = Element> extends SyntheticEvent<T, NativeCompositionEvent> {
        data: string;
    }

    interface DragEvent<T = Element> extends MouseEvent<T, NativeDragEvent> {
        dataTransfer: DataTransfer;
    }

    interface PointerEvent<T = Element> extends MouseEvent<T, NativePointerEvent> {
        pointerId: number;
        pressure: number;
        tiltX: number;
        tiltY: number;
        width: number;
        height: number;
        pointerType: 'mouse' | 'pen' | 'touch';
        isPrimary: boolean;
    }

    interface FocusEvent<T = Element> extends SyntheticEvent<T, NativeFocusEvent> {
        relatedTarget: EventTarget;
        target: EventTarget & T;
    }

    // tslint:disable-next-line:no-empty-interface
    interface FormEvent<T = Element> extends SyntheticEvent<T> {
    }

    interface InvalidEvent<T = Element> extends SyntheticEvent<T> {
        target: EventTarget & T;
    }

    interface ChangeEvent<T = Element> extends SyntheticEvent<T> {
        target: EventTarget & T;
    }

    interface KeyboardEvent<T = Element> extends SyntheticEvent<T, NativeKeyboardEvent> {
        altKey: boolean;
        charCode: number;
        ctrlKey: boolean;
        /**
         * See [DOM Level 3 Events spec](https://www.w3.org/TR/uievents-key/#keys-modifier). for a list of valid (case-sensitive) arguments to this method.
         */
        getModifierState(key: string): boolean;
        /**
         * See the [DOM Level 3 Events spec](https://www.w3.org/TR/uievents-key/#named-key-attribute-values). for possible values
         */
        key: string;
        keyCode: number;
        locale: string;
        location: number;
        metaKey: boolean;
        repeat: boolean;
        shiftKey: boolean;
        which: number;
    }

    interface MouseEvent<T = Element, E = NativeMouseEvent> extends SyntheticEvent<T, E> {
        altKey: boolean;
        button: number;
        buttons: number;
        clientX: number;
        clientY: number;
        ctrlKey: boolean;
        /**
         * See [DOM Level 3 Events spec](https://www.w3.org/TR/uievents-key/#keys-modifier). for a list of valid (case-sensitive) arguments to this method.
         */
        getModifierState(key: string): boolean;
        metaKey: boolean;
        movementX: number;
        movementY: number;
        pageX: number;
        pageY: number;
        relatedTarget: EventTarget;
        screenX: number;
        screenY: number;
        shiftKey: boolean;
    }

    interface TouchEvent<T = Element> extends SyntheticEvent<T, NativeTouchEvent> {
        altKey: boolean;
        changedTouches: TouchList;
        ctrlKey: boolean;
        /**
         * See [DOM Level 3 Events spec](https://www.w3.org/TR/uievents-key/#keys-modifier). for a list of valid (case-sensitive) arguments to this method.
         */
        getModifierState(key: string): boolean;
        metaKey: boolean;
        shiftKey: boolean;
        targetTouches: TouchList;
        touches: TouchList;
    }

    interface UIEvent<T = Element> extends SyntheticEvent<T, NativeUIEvent> {
        detail: number;
        view: AbstractView;
    }

    interface WheelEvent<T = Element> extends MouseEvent<T, NativeWheelEvent> {
        deltaMode: number;
        deltaX: number;
        deltaY: number;
        deltaZ: number;
    }

    interface AnimationEvent<T = Element> extends SyntheticEvent<T, NativeAnimationEvent> {
        animationName: string;
        elapsedTime: number;
        pseudoElement: string;
    }

    interface TransitionEvent<T = Element> extends SyntheticEvent<T, NativeTransitionEvent> {
        elapsedTime: number;
        propertyName: string;
        pseudoElement: string;
    }

    //
    // Event Handler Types
    // ----------------------------------------------------------------------

    type EventHandler<E extends SyntheticEvent<any>> = { bivarianceHack(event: E): void }["bivarianceHack"];

    type ReactEventHandler<T = Element> = EventHandler<SyntheticEvent<T>>;

    type ClipboardEventHandler<T = Element> = EventHandler<ClipboardEvent<T>>;
    type CompositionEventHandler<T = Element> = EventHandler<CompositionEvent<T>>;
    type DragEventHandler<T = Element> = EventHandler<DragEvent<T>>;
    type FocusEventHandler<T = Element> = EventHandler<FocusEvent<T>>;
    type FormEventHandler<T = Element> = EventHandler<FormEvent<T>>;
    type ChangeEventHandler<T = Element> = EventHandler<ChangeEvent<T>>;
    type KeyboardEventHandler<T = Element> = EventHandler<KeyboardEvent<T>>;
    type MouseEventHandler<T = Element> = EventHandler<MouseEvent<T>>;
    type TouchEventHandler<T = Element> = EventHandler<TouchEvent<T>>;
    type PointerEventHandler<T = Element> = EventHandler<PointerEvent<T>>;
    type UIEventHandler<T = Element> = EventHandler<UIEvent<T>>;
    type WheelEventHandler<T = Element> = EventHandler<WheelEvent<T>>;
    type AnimationEventHandler<T = Element> = EventHandler<AnimationEvent<T>>;
    type TransitionEventHandler<T = Element> = EventHandler<TransitionEvent<T>>;

    //
    // Props / DOM Attributes
    // ----------------------------------------------------------------------

    /**
     * @deprecated. This was used to allow clients to pass `ref` and `key`
     * to `createElement`, which is no longer necessary due to intersection
     * types. If you need to declare a props object before passing it to
     * `createElement` or a factory, use `ClassAttributes<T>`:
     *
     * ```ts
     * var b: Button | null;
     * var props: ButtonProps & ClassAttributes<Button> = {
     *     ref: b => button = b, // ok!
     *     label: "I'm a Button"
     * };
     * ```
     */
    interface Props<T> {
        children?: ReactNode;
        key?: Key;
        ref?: LegacyRef<T>;
    }

    interface HTMLProps<T> extends AllHTMLAttributes<T>, ClassAttributes<T> {
    }

    type DetailedHTMLProps<E extends HTMLAttributes<T>, T> = ClassAttributes<T> & E;

    interface SVGProps<T> extends SVGAttributes<T>, ClassAttributes<T> {
    }

    interface DOMAttributes<T> {
        children?: ReactNode;
        dangerouslySetInnerHTML?: {
            __html: string;
        };

        // Clipboard Events
        onCopy?: ClipboardEventHandler<T>;
        onCopyCapture?: ClipboardEventHandler<T>;
        onCut?: ClipboardEventHandler<T>;
        onCutCapture?: ClipboardEventHandler<T>;
        onPaste?: ClipboardEventHandler<T>;
        onPasteCapture?: ClipboardEventHandler<T>;

        // Composition Events
        onCompositionEnd?: CompositionEventHandler<T>;
        onCompositionEndCapture?: CompositionEventHandler<T>;
        onCompositionStart?: CompositionEventHandler<T>;
        onCompositionStartCapture?: CompositionEventHandler<T>;
        onCompositionUpdate?: CompositionEventHandler<T>;
        onCompositionUpdateCapture?: CompositionEventHandler<T>;

        // Focus Events
        onFocus?: FocusEventHandler<T>;
        onFocusCapture?: FocusEventHandler<T>;
        onBlur?: FocusEventHandler<T>;
        onBlurCapture?: FocusEventHandler<T>;

        // Form Events
        onChange?: FormEventHandler<T>;
        onChangeCapture?: FormEventHandler<T>;
        onBeforeInput?: FormEventHandler<T>;
        onBeforeInputCapture?: FormEventHandler<T>;
        onInput?: FormEventHandler<T>;
        onInputCapture?: FormEventHandler<T>;
        onReset?: FormEventHandler<T>;
        onResetCapture?: FormEventHandler<T>;
        onSubmit?: FormEventHandler<T>;
        onSubmitCapture?: FormEventHandler<T>;
        onInvalid?: FormEventHandler<T>;
        onInvalidCapture?: FormEventHandler<T>;

        // Image Events
        onLoad?: ReactEventHandler<T>;
        onLoadCapture?: ReactEventHandler<T>;
        onError?: ReactEventHandler<T>; // also a Media Event
        onErrorCapture?: ReactEventHandler<T>; // also a Media Event

        // Keyboard Events
        onKeyDown?: KeyboardEventHandler<T>;
        onKeyDownCapture?: KeyboardEventHandler<T>;
        onKeyPress?: KeyboardEventHandler<T>;
        onKeyPressCapture?: KeyboardEventHandler<T>;
        onKeyUp?: KeyboardEventHandler<T>;
        onKeyUpCapture?: KeyboardEventHandler<T>;

        // Media Events
        onAbort?: ReactEventHandler<T>;
        onAbortCapture?: ReactEventHandler<T>;
        onCanPlay?: ReactEventHandler<T>;
        onCanPlayCapture?: ReactEventHandler<T>;
        onCanPlayThrough?: ReactEventHandler<T>;
        onCanPlayThroughCapture?: ReactEventHandler<T>;
        onDurationChange?: ReactEventHandler<T>;
        onDurationChangeCapture?: ReactEventHandler<T>;
        onEmptied?: ReactEventHandler<T>;
        onEmptiedCapture?: ReactEventHandler<T>;
        onEncrypted?: ReactEventHandler<T>;
        onEncryptedCapture?: ReactEventHandler<T>;
        onEnded?: ReactEventHandler<T>;
        onEndedCapture?: ReactEventHandler<T>;
        onLoadedData?: ReactEventHandler<T>;
        onLoadedDataCapture?: ReactEventHandler<T>;
        onLoadedMetadata?: ReactEventHandler<T>;
        onLoadedMetadataCapture?: ReactEventHandler<T>;
        onLoadStart?: ReactEventHandler<T>;
        onLoadStartCapture?: ReactEventHandler<T>;
        onPause?: ReactEventHandler<T>;
        onPauseCapture?: ReactEventHandler<T>;
        onPlay?: ReactEventHandler<T>;
        onPlayCapture?: ReactEventHandler<T>;
        onPlaying?: ReactEventHandler<T>;
        onPlayingCapture?: ReactEventHandler<T>;
        onProgress?: ReactEventHandler<T>;
        onProgressCapture?: ReactEventHandler<T>;
        onRateChange?: ReactEventHandler<T>;
        onRateChangeCapture?: ReactEventHandler<T>;
        onSeeked?: ReactEventHandler<T>;
        onSeekedCapture?: ReactEventHandler<T>;
        onSeeking?: ReactEventHandler<T>;
        onSeekingCapture?: ReactEventHandler<T>;
        onStalled?: ReactEventHandler<T>;
        onStalledCapture?: ReactEventHandler<T>;
        onSuspend?: ReactEventHandler<T>;
        onSuspendCapture?: ReactEventHandler<T>;
        onTimeUpdate?: ReactEventHandler<T>;
        onTimeUpdateCapture?: ReactEventHandler<T>;
        onVolumeChange?: ReactEventHandler<T>;
        onVolumeChangeCapture?: ReactEventHandler<T>;
        onWaiting?: ReactEventHandler<T>;
        onWaitingCapture?: ReactEventHandler<T>;

        // MouseEvents
        onAuxClick?: MouseEventHandler<T>;
        onAuxClickCapture?: MouseEventHandler<T>;
        onClick?: MouseEventHandler<T>;
        onClickCapture?: MouseEventHandler<T>;
        onContextMenu?: MouseEventHandler<T>;
        onContextMenuCapture?: MouseEventHandler<T>;
        onDoubleClick?: MouseEventHandler<T>;
        onDoubleClickCapture?: MouseEventHandler<T>;
        onDrag?: DragEventHandler<T>;
        onDragCapture?: DragEventHandler<T>;
        onDragEnd?: DragEventHandler<T>;
        onDragEndCapture?: DragEventHandler<T>;
        onDragEnter?: DragEventHandler<T>;
        onDragEnterCapture?: DragEventHandler<T>;
        onDragExit?: DragEventHandler<T>;
        onDragExitCapture?: DragEventHandler<T>;
        onDragLeave?: DragEventHandler<T>;
        onDragLeaveCapture?: DragEventHandler<T>;
        onDragOver?: DragEventHandler<T>;
        onDragOverCapture?: DragEventHandler<T>;
        onDragStart?: DragEventHandler<T>;
        onDragStartCapture?: DragEventHandler<T>;
        onDrop?: DragEventHandler<T>;
        onDropCapture?: DragEventHandler<T>;
        onMouseDown?: MouseEventHandler<T>;
        onMouseDownCapture?: MouseEventHandler<T>;
        onMouseEnter?: MouseEventHandler<T>;
        onMouseLeave?: MouseEventHandler<T>;
        onMouseMove?: MouseEventHandler<T>;
        onMouseMoveCapture?: MouseEventHandler<T>;
        onMouseOut?: MouseEventHandler<T>;
        onMouseOutCapture?: MouseEventHandler<T>;
        onMouseOver?: MouseEventHandler<T>;
        onMouseOverCapture?: MouseEventHandler<T>;
        onMouseUp?: MouseEventHandler<T>;
        onMouseUpCapture?: MouseEventHandler<T>;

        // Selection Events
        onSelect?: ReactEventHandler<T>;
        onSelectCapture?: ReactEventHandler<T>;

        // Touch Events
        onTouchCancel?: TouchEventHandler<T>;
        onTouchCancelCapture?: TouchEventHandler<T>;
        onTouchEnd?: TouchEventHandler<T>;
        onTouchEndCapture?: TouchEventHandler<T>;
        onTouchMove?: TouchEventHandler<T>;
        onTouchMoveCapture?: TouchEventHandler<T>;
        onTouchStart?: TouchEventHandler<T>;
        onTouchStartCapture?: TouchEventHandler<T>;

        // Pointer Events
        onPointerDown?: PointerEventHandler<T>;
        onPointerDownCapture?: PointerEventHandler<T>;
        onPointerMove?: PointerEventHandler<T>;
        onPointerMoveCapture?: PointerEventHandler<T>;
        onPointerUp?: PointerEventHandler<T>;
        onPointerUpCapture?: PointerEventHandler<T>;
        onPointerCancel?: PointerEventHandler<T>;
        onPointerCancelCapture?: PointerEventHandler<T>;
        onPointerEnter?: PointerEventHandler<T>;
        onPointerEnterCapture?: PointerEventHandler<T>;
        onPointerLeave?: PointerEventHandler<T>;
        onPointerLeaveCapture?: PointerEventHandler<T>;
        onPointerOver?: PointerEventHandler<T>;
        onPointerOverCapture?: PointerEventHandler<T>;
        onPointerOut?: PointerEventHandler<T>;
        onPointerOutCapture?: PointerEventHandler<T>;
        onGotPointerCapture?: PointerEventHandler<T>;
        onGotPointerCaptureCapture?: PointerEventHandler<T>;
        onLostPointerCapture?: PointerEventHandler<T>;
        onLostPointerCaptureCapture?: PointerEventHandler<T>;

        // UI Events
        onScroll?: UIEventHandler<T>;
        onScrollCapture?: UIEventHandler<T>;

        // Wheel Events
        onWheel?: WheelEventHandler<T>;
        onWheelCapture?: WheelEventHandler<T>;

        // Animation Events
        onAnimationStart?: AnimationEventHandler<T>;
        onAnimationStartCapture?: AnimationEventHandler<T>;
        onAnimationEnd?: AnimationEventHandler<T>;
        onAnimationEndCapture?: AnimationEventHandler<T>;
        onAnimationIteration?: AnimationEventHandler<T>;
        onAnimationIterationCapture?: AnimationEventHandler<T>;

        // Transition Events
        onTransitionEnd?: TransitionEventHandler<T>;
        onTransitionEndCapture?: TransitionEventHandler<T>;
    }

    interface CSSProperties extends CSS.Properties<string | number> {
        /**
         * The index signature was removed to enable closed typing for style
         * using CSSType. You're able to use type assertion or module augmentation
         * to add properties or an index signature of your own.
         *
         * For examples and more information, visit:
         * https://github.com/frenic/csstype#what-should-i-do-when-i-get-type-errors
         */
    }

    // All the WAI-ARIA 1.1 attributes from https://www.w3.org/TR/wai-aria-1.1/
    interface AriaAttributes {
        /** Identifies the currently active element when DOM focus is on a composite widget, textbox, group, or application. */
        'aria-activedescendant'?: string;
        /** Indicates whether assistive technologies will present all, or only parts of, the changed region based on the change notifications defined by the aria-relevant attribute. */
        'aria-atomic'?: boolean | 'false' | 'true';
        /**
         * Indicates whether inputting text could trigger display of one or more predictions of the user's intended value for an input and specifies how predictions would be
         * presented if they are made.
         */
        'aria-autocomplete'?: 'none' | 'inline' | 'list' | 'both';
        /** Indicates an element is being modified and that assistive technologies MAY want to wait until the modifications are complete before exposing them to the user. */
        'aria-busy'?: boolean | 'false' | 'true';
        /**
         * Indicates the current "checked" state of checkboxes, radio buttons, and other widgets.
         * @see aria-pressed @see aria-selected.
         */
        'aria-checked'?: boolean | 'false' | 'mixed' | 'true';
        /**
         * Defines the total number of columns in a table, grid, or treegrid.
         * @see aria-colindex.
         */
        'aria-colcount'?: number;
        /**
         * Defines an element's column index or position with respect to the total number of columns within a table, grid, or treegrid.
         * @see aria-colcount @see aria-colspan.
         */
        'aria-colindex'?: number;
        /**
         * Defines the number of columns spanned by a cell or gridcell within a table, grid, or treegrid.
         * @see aria-colindex @see aria-rowspan.
         */
        'aria-colspan'?: number;
        /**
         * Identifies the element (or elements) whose contents or presence are controlled by the current element.
         * @see aria-owns.
         */
        'aria-controls'?: string;
        /** Indicates the element that represents the current item within a container or set of related elements. */
        'aria-current'?: boolean | 'false' | 'true' | 'page' | 'step' | 'location' | 'date' | 'time';
        /**
         * Identifies the element (or elements) that describes the object.
         * @see aria-labelledby
         */
        'aria-describedby'?: string;
        /**
         * Identifies the element that provides a detailed, extended description for the object.
         * @see aria-describedby.
         */
        'aria-details'?: string;
        /**
         * Indicates that the element is perceivable but disabled, so it is not editable or otherwise operable.
         * @see aria-hidden @see aria-readonly.
         */
        'aria-disabled'?: boolean | 'false' | 'true';
        /**
         * Indicates what functions can be performed when a dragged object is released on the drop target.
         * @deprecated in ARIA 1.1
         */
        'aria-dropeffect'?: 'none' | 'copy' | 'execute' | 'link' | 'move' | 'popup';
        /**
         * Identifies the element that provides an error message for the object.
         * @see aria-invalid @see aria-describedby.
         */
        'aria-errormessage'?: string;
        /** Indicates whether the element, or another grouping element it controls, is currently expanded or collapsed. */
        'aria-expanded'?: boolean | 'false' | 'true';
        /**
         * Identifies the next element (or elements) in an alternate reading order of content which, at the user's discretion,
         * allows assistive technology to override the general default of reading in document source order.
         */
        'aria-flowto'?: string;
        /**
         * Indicates an element's "grabbed" state in a drag-and-drop operation.
         * @deprecated in ARIA 1.1
         */
        'aria-grabbed'?: boolean | 'false' | 'true';
        /** Indicates the availability and type of interactive popup element, such as menu or dialog, that can be triggered by an element. */
        'aria-haspopup'?: boolean | 'false' | 'true' | 'menu' | 'listbox' | 'tree' | 'grid' | 'dialog';
        /**
         * Indicates whether the element is exposed to an accessibility API.
         * @see aria-disabled.
         */
        'aria-hidden'?: boolean | 'false' | 'true';
        /**
         * Indicates the entered value does not conform to the format expected by the application.
         * @see aria-errormessage.
         */
        'aria-invalid'?: boolean | 'false' | 'true' | 'grammar' | 'spelling';
        /** Indicates keyboard shortcuts that an author has implemented to activate or give focus to an element. */
        'aria-keyshortcuts'?: string;
        /**
         * Defines a string value that labels the current element.
         * @see aria-labelledby.
         */
        'aria-label'?: string;
        /**
         * Identifies the element (or elements) that labels the current element.
         * @see aria-describedby.
         */
        'aria-labelledby'?: string;
        /** Defines the hierarchical level of an element within a structure. */
        'aria-level'?: number;
        /** Indicates that an element will be updated, and describes the types of updates the user agents, assistive technologies, and user can expect from the live region. */
        'aria-live'?: 'off' | 'assertive' | 'polite';
        /** Indicates whether an element is modal when displayed. */
        'aria-modal'?: boolean | 'false' | 'true';
        /** Indicates whether a text box accepts multiple lines of input or only a single line. */
        'aria-multiline'?: boolean | 'false' | 'true';
        /** Indicates that the user may select more than one item from the current selectable descendants. */
        'aria-multiselectable'?: boolean | 'false' | 'true';
        /** Indicates whether the element's orientation is horizontal, vertical, or unknown/ambiguous. */
        'aria-orientation'?: 'horizontal' | 'vertical';
        /**
         * Identifies an element (or elements) in order to define a visual, functional, or contextual parent/child relationship
         * between DOM elements where the DOM hierarchy cannot be used to represent the relationship.
         * @see aria-controls.
         */
        'aria-owns'?: string;
        /**
         * Defines a short hint (a word or short phrase) intended to aid the user with data entry when the control has no value.
         * A hint could be a sample value or a brief description of the expected format.
         */
        'aria-placeholder'?: string;
        /**
         * Defines an element's number or position in the current set of listitems or treeitems. Not required if all elements in the set are present in the DOM.
         * @see aria-setsize.
         */
        'aria-posinset'?: number;
        /**
         * Indicates the current "pressed" state of toggle buttons.
         * @see aria-checked @see aria-selected.
         */
        'aria-pressed'?: boolean | 'false' | 'mixed' | 'true';
        /**
         * Indicates that the element is not editable, but is otherwise operable.
         * @see aria-disabled.
         */
        'aria-readonly'?: boolean | 'false' | 'true';
        /**
         * Indicates what notifications the user agent will trigger when the accessibility tree within a live region is modified.
         * @see aria-atomic.
         */
        'aria-relevant'?: 'additions' | 'additions text' | 'all' | 'removals' | 'text';
        /** Indicates that user input is required on the element before a form may be submitted. */
        'aria-required'?: boolean | 'false' | 'true';
        /** Defines a human-readable, author-localized description for the role of an element. */
        'aria-roledescription'?: string;
        /**
         * Defines the total number of rows in a table, grid, or treegrid.
         * @see aria-rowindex.
         */
        'aria-rowcount'?: number;
        /**
         * Defines an element's row index or position with respect to the total number of rows within a table, grid, or treegrid.
         * @see aria-rowcount @see aria-rowspan.
         */
        'aria-rowindex'?: number;
        /**
         * Defines the number of rows spanned by a cell or gridcell within a table, grid, or treegrid.
         * @see aria-rowindex @see aria-colspan.
         */
        'aria-rowspan'?: number;
        /**
         * Indicates the current "selected" state of various widgets.
         * @see aria-checked @see aria-pressed.
         */
        'aria-selected'?: boolean | 'false' | 'true';
        /**
         * Defines the number of items in the current set of listitems or treeitems. Not required if all elements in the set are present in the DOM.
         * @see aria-posinset.
         */
        'aria-setsize'?: number;
        /** Indicates if items in a table or grid are sorted in ascending or descending order. */
        'aria-sort'?: 'none' | 'ascending' | 'descending' | 'other';
        /** Defines the maximum allowed value for a range widget. */
        'aria-valuemax'?: number;
        /** Defines the minimum allowed value for a range widget. */
        'aria-valuemin'?: number;
        /**
         * Defines the current value for a range widget.
         * @see aria-valuetext.
         */
        'aria-valuenow'?: number;
        /** Defines the human readable text alternative of aria-valuenow for a range widget. */
        'aria-valuetext'?: string;
    }

    interface HTMLAttributes<T> extends AriaAttributes, DOMAttributes<T> {
        // React-specific Attributes
        defaultChecked?: boolean;
        defaultValue?: string | string[];
        suppressContentEditableWarning?: boolean;
        suppressHydrationWarning?: boolean;

        // Standard HTML Attributes
        accessKey?: string;
        className?: string;
        contentEditable?: boolean;
        contextMenu?: string;
        dir?: string;
        draggable?: boolean;
        hidden?: boolean;
        id?: string;
        lang?: string;
        placeholder?: string;
        slot?: string;
        spellCheck?: boolean;
        style?: CSSProperties;
        tabIndex?: number;
        title?: string;

        // Unknown
        inputMode?: string;
        is?: string;
        radioGroup?: string; // <command>, <menuitem>

        // WAI-ARIA
        role?: string;

        // RDFa Attributes
        about?: string;
        datatype?: string;
        inlist?: any;
        prefix?: string;
        property?: string;
        resource?: string;
        typeof?: string;
        vocab?: string;

        // Non-standard Attributes
        autoCapitalize?: string;
        autoCorrect?: string;
        autoSave?: string;
        color?: string;
        itemProp?: string;
        itemScope?: boolean;
        itemType?: string;
        itemID?: string;
        itemRef?: string;
        results?: number;
        security?: string;
        unselectable?: 'on' | 'off';
    }

    interface AllHTMLAttributes<T> extends HTMLAttributes<T> {
        // Standard HTML Attributes
        accept?: string;
        acceptCharset?: string;
        action?: string;
        allowFullScreen?: boolean;
        allowTransparency?: boolean;
        alt?: string;
        as?: string;
        async?: boolean;
        autoComplete?: string;
        autoFocus?: boolean;
        autoPlay?: boolean;
        capture?: boolean | string;
        cellPadding?: number | string;
        cellSpacing?: number | string;
        charSet?: string;
        challenge?: string;
        checked?: boolean;
        cite?: string;
        classID?: string;
        cols?: number;
        colSpan?: number;
        content?: string;
        controls?: boolean;
        coords?: string;
        crossOrigin?: string;
        data?: string;
        dateTime?: string;
        default?: boolean;
        defer?: boolean;
        disabled?: boolean;
        download?: any;
        encType?: string;
        form?: string;
        formAction?: string;
        formEncType?: string;
        formMethod?: string;
        formNoValidate?: boolean;
        formTarget?: string;
        frameBorder?: number | string;
        headers?: string;
        height?: number | string;
        high?: number;
        href?: string;
        hrefLang?: string;
        htmlFor?: string;
        httpEquiv?: string;
        integrity?: string;
        keyParams?: string;
        keyType?: string;
        kind?: string;
        label?: string;
        list?: string;
        loop?: boolean;
        low?: number;
        manifest?: string;
        marginHeight?: number;
        marginWidth?: number;
        max?: number | string;
        maxLength?: number;
        media?: string;
        mediaGroup?: string;
        method?: string;
        min?: number | string;
        minLength?: number;
        multiple?: boolean;
        muted?: boolean;
        name?: string;
        nonce?: string;
        noValidate?: boolean;
        open?: boolean;
        optimum?: number;
        pattern?: string;
        placeholder?: string;
        playsInline?: boolean;
        poster?: string;
        preload?: string;
        readOnly?: boolean;
        rel?: string;
        required?: boolean;
        reversed?: boolean;
        rows?: number;
        rowSpan?: number;
        sandbox?: string;
        scope?: string;
        scoped?: boolean;
        scrolling?: string;
        seamless?: boolean;
        selected?: boolean;
        shape?: string;
        size?: number;
        sizes?: string;
        span?: number;
        src?: string;
        srcDoc?: string;
        srcLang?: string;
        srcSet?: string;
        start?: number;
        step?: number | string;
        summary?: string;
        target?: string;
        type?: string;
        useMap?: string;
        value?: string | string[] | number;
        width?: number | string;
        wmode?: string;
        wrap?: string;
    }

    interface AnchorHTMLAttributes<T> extends HTMLAttributes<T> {
        download?: any;
        href?: string;
        hrefLang?: string;
        media?: string;
        ping?: string;
        rel?: string;
        target?: string;
        type?: string;
        referrerPolicy?: string;
    }

    // tslint:disable-next-line:no-empty-interface
    interface AudioHTMLAttributes<T> extends MediaHTMLAttributes<T> {}

    interface AreaHTMLAttributes<T> extends HTMLAttributes<T> {
        alt?: string;
        coords?: string;
        download?: any;
        href?: string;
        hrefLang?: string;
        media?: string;
        rel?: string;
        shape?: string;
        target?: string;
    }

    interface BaseHTMLAttributes<T> extends HTMLAttributes<T> {
        href?: string;
        target?: string;
    }

    interface BlockquoteHTMLAttributes<T> extends HTMLAttributes<T> {
        cite?: string;
    }

    interface ButtonHTMLAttributes<T> extends HTMLAttributes<T> {
        autoFocus?: boolean;
        disabled?: boolean;
        form?: string;
        formAction?: string;
        formEncType?: string;
        formMethod?: string;
        formNoValidate?: boolean;
        formTarget?: string;
        name?: string;
        type?: 'submit' | 'reset' | 'button';
        value?: string | string[] | number;
    }

    interface CanvasHTMLAttributes<T> extends HTMLAttributes<T> {
        height?: number | string;
        width?: number | string;
    }

    interface ColHTMLAttributes<T> extends HTMLAttributes<T> {
        span?: number;
        width?: number | string;
    }

    interface ColgroupHTMLAttributes<T> extends HTMLAttributes<T> {
        span?: number;
    }

    interface DataHTMLAttributes<T> extends HTMLAttributes<T> {
        value?: string | string[] | number;
    }

    interface DetailsHTMLAttributes<T> extends HTMLAttributes<T> {
        open?: boolean;
    }

    interface DelHTMLAttributes<T> extends HTMLAttributes<T> {
        cite?: string;
        dateTime?: string;
    }

    interface DialogHTMLAttributes<T> extends HTMLAttributes<T> {
        open?: boolean;
    }

    interface EmbedHTMLAttributes<T> extends HTMLAttributes<T> {
        height?: number | string;
        src?: string;
        type?: string;
        width?: number | string;
    }

    interface FieldsetHTMLAttributes<T> extends HTMLAttributes<T> {
        disabled?: boolean;
        form?: string;
        name?: string;
    }

    interface FormHTMLAttributes<T> extends HTMLAttributes<T> {
        acceptCharset?: string;
        action?: string;
        autoComplete?: string;
        encType?: string;
        method?: string;
        name?: string;
        noValidate?: boolean;
        target?: string;
    }

    interface HtmlHTMLAttributes<T> extends HTMLAttributes<T> {
        manifest?: string;
    }

    interface IframeHTMLAttributes<T> extends HTMLAttributes<T> {
        allow?: string;
        allowFullScreen?: boolean;
        allowTransparency?: boolean;
        frameBorder?: number | string;
        height?: number | string;
        marginHeight?: number;
        marginWidth?: number;
        name?: string;
        referrerPolicy?: string;
        sandbox?: string;
        scrolling?: string;
        seamless?: boolean;
        src?: string;
        srcDoc?: string;
        width?: number | string;
    }

    interface ImgHTMLAttributes<T> extends HTMLAttributes<T> {
        alt?: string;
        crossOrigin?: "anonymous" | "use-credentials" | "";
        decoding?: "async" | "auto" | "sync";
        height?: number | string;
        sizes?: string;
        src?: string;
        srcSet?: string;
        useMap?: string;
        width?: number | string;
    }

    interface InsHTMLAttributes<T> extends HTMLAttributes<T> {
        cite?: string;
        dateTime?: string;
    }

    interface InputHTMLAttributes<T> extends HTMLAttributes<T> {
        accept?: string;
        alt?: string;
        autoComplete?: string;
        autoFocus?: boolean;
        capture?: boolean | string; // https://www.w3.org/TR/html-media-capture/#the-capture-attribute
        checked?: boolean;
        crossOrigin?: string;
        disabled?: boolean;
        form?: string;
        formAction?: string;
        formEncType?: string;
        formMethod?: string;
        formNoValidate?: boolean;
        formTarget?: string;
        height?: number | string;
        list?: string;
        max?: number | string;
        maxLength?: number;
        min?: number | string;
        minLength?: number;
        multiple?: boolean;
        name?: string;
        pattern?: string;
        placeholder?: string;
        readOnly?: boolean;
        required?: boolean;
        size?: number;
        src?: string;
        step?: number | string;
        type?: string;
        value?: string | string[] | number;
        width?: number | string;

        onChange?: ChangeEventHandler<T>;
    }

    interface KeygenHTMLAttributes<T> extends HTMLAttributes<T> {
        autoFocus?: boolean;
        challenge?: string;
        disabled?: boolean;
        form?: string;
        keyType?: string;
        keyParams?: string;
        name?: string;
    }

    interface LabelHTMLAttributes<T> extends HTMLAttributes<T> {
        form?: string;
        htmlFor?: string;
    }

    interface LiHTMLAttributes<T> extends HTMLAttributes<T> {
        value?: string | string[] | number;
    }

    interface LinkHTMLAttributes<T> extends HTMLAttributes<T> {
        as?: string;
        crossOrigin?: string;
        href?: string;
        hrefLang?: string;
        integrity?: string;
        media?: string;
        rel?: string;
        sizes?: string;
        type?: string;
    }

    interface MapHTMLAttributes<T> extends HTMLAttributes<T> {
        name?: string;
    }

    interface MenuHTMLAttributes<T> extends HTMLAttributes<T> {
        type?: string;
    }

    interface MediaHTMLAttributes<T> extends HTMLAttributes<T> {
        autoPlay?: boolean;
        controls?: boolean;
        controlsList?: string;
        crossOrigin?: string;
        loop?: boolean;
        mediaGroup?: string;
        muted?: boolean;
        playsinline?: boolean;
        preload?: string;
        src?: string;
    }

    interface MetaHTMLAttributes<T> extends HTMLAttributes<T> {
        charSet?: string;
        content?: string;
        httpEquiv?: string;
        name?: string;
    }

    interface MeterHTMLAttributes<T> extends HTMLAttributes<T> {
        form?: string;
        high?: number;
        low?: number;
        max?: number | string;
        min?: number | string;
        optimum?: number;
        value?: string | string[] | number;
    }

    interface QuoteHTMLAttributes<T> extends HTMLAttributes<T> {
        cite?: string;
    }

    interface ObjectHTMLAttributes<T> extends HTMLAttributes<T> {
        classID?: string;
        data?: string;
        form?: string;
        height?: number | string;
        name?: string;
        type?: string;
        useMap?: string;
        width?: number | string;
        wmode?: string;
    }

    interface OlHTMLAttributes<T> extends HTMLAttributes<T> {
        reversed?: boolean;
        start?: number;
        type?: '1' | 'a' | 'A' | 'i' | 'I';
    }

    interface OptgroupHTMLAttributes<T> extends HTMLAttributes<T> {
        disabled?: boolean;
        label?: string;
    }

    interface OptionHTMLAttributes<T> extends HTMLAttributes<T> {
        disabled?: boolean;
        label?: string;
        selected?: boolean;
        value?: string | string[] | number;
    }

    interface OutputHTMLAttributes<T> extends HTMLAttributes<T> {
        form?: string;
        htmlFor?: string;
        name?: string;
    }

    interface ParamHTMLAttributes<T> extends HTMLAttributes<T> {
        name?: string;
        value?: string | string[] | number;
    }

    interface ProgressHTMLAttributes<T> extends HTMLAttributes<T> {
        max?: number | string;
        value?: string | string[] | number;
    }

    interface ScriptHTMLAttributes<T> extends HTMLAttributes<T> {
        async?: boolean;
        charSet?: string;
        crossOrigin?: string;
        defer?: boolean;
        integrity?: string;
        noModule?: boolean;
        nonce?: string;
        src?: string;
        type?: string;
    }

    interface SelectHTMLAttributes<T> extends HTMLAttributes<T> {
        autoComplete?: string;
        autoFocus?: boolean;
        disabled?: boolean;
        form?: string;
        multiple?: boolean;
        name?: string;
        required?: boolean;
        size?: number;
        value?: string | string[] | number;
        onChange?: ChangeEventHandler<T>;
    }

    interface SourceHTMLAttributes<T> extends HTMLAttributes<T> {
        media?: string;
        sizes?: string;
        src?: string;
        srcSet?: string;
        type?: string;
    }

    interface StyleHTMLAttributes<T> extends HTMLAttributes<T> {
        media?: string;
        nonce?: string;
        scoped?: boolean;
        type?: string;
    }

    interface TableHTMLAttributes<T> extends HTMLAttributes<T> {
        cellPadding?: number | string;
        cellSpacing?: number | string;
        summary?: string;
    }

    interface TextareaHTMLAttributes<T> extends HTMLAttributes<T> {
        autoComplete?: string;
        autoFocus?: boolean;
        cols?: number;
        dirName?: string;
        disabled?: boolean;
        form?: string;
        maxLength?: number;
        minLength?: number;
        name?: string;
        placeholder?: string;
        readOnly?: boolean;
        required?: boolean;
        rows?: number;
        value?: string | string[] | number;
        wrap?: string;

        onChange?: ChangeEventHandler<T>;
    }

    interface TdHTMLAttributes<T> extends HTMLAttributes<T> {
        align?: "left" | "center" | "right" | "justify" | "char";
        colSpan?: number;
        headers?: string;
        rowSpan?: number;
        scope?: string;
        valign?: "top" | "middle" | "bottom" | "baseline";
    }

    interface ThHTMLAttributes<T> extends HTMLAttributes<T> {
        align?: "left" | "center" | "right" | "justify" | "char";
        colSpan?: number;
        headers?: string;
        rowSpan?: number;
        scope?: string;
    }

    interface TimeHTMLAttributes<T> extends HTMLAttributes<T> {
        dateTime?: string;
    }

    interface TrackHTMLAttributes<T> extends HTMLAttributes<T> {
        default?: boolean;
        kind?: string;
        label?: string;
        src?: string;
        srcLang?: string;
    }

    interface VideoHTMLAttributes<T> extends MediaHTMLAttributes<T> {
        height?: number | string;
        playsInline?: boolean;
        poster?: string;
        width?: number | string;
        disablePictureInPicture?: boolean;
    }

    // this list is "complete" in that it contains every SVG attribute
    // that React supports, but the types can be improved.
    // Full list here: https://facebook.github.io/react/docs/dom-elements.html
    //
    // The three broad type categories are (in order of restrictiveness):
    //   - "number | string"
    //   - "string"
    //   - union of string literals
    interface SVGAttributes<T> extends AriaAttributes, DOMAttributes<T> {
        // Attributes which also defined in HTMLAttributes
        // See comment in SVGDOMPropertyConfig.js
        className?: string;
        color?: string;
        height?: number | string;
        id?: string;
        lang?: string;
        max?: number | string;
        media?: string;
        method?: string;
        min?: number | string;
        name?: string;
        style?: CSSProperties;
        target?: string;
        type?: string;
        width?: number | string;

        // Other HTML properties supported by SVG elements in browsers
        role?: string;
        tabIndex?: number;

        // SVG Specific attributes
        accentHeight?: number | string;
        accumulate?: "none" | "sum";
        additive?: "replace" | "sum";
        alignmentBaseline?: "auto" | "baseline" | "before-edge" | "text-before-edge" | "middle" | "central" | "after-edge" |
        "text-after-edge" | "ideographic" | "alphabetic" | "hanging" | "mathematical" | "inherit";
        allowReorder?: "no" | "yes";
        alphabetic?: number | string;
        amplitude?: number | string;
        arabicForm?: "initial" | "medial" | "terminal" | "isolated";
        ascent?: number | string;
        attributeName?: string;
        attributeType?: string;
        autoReverse?: number | string;
        azimuth?: number | string;
        baseFrequency?: number | string;
        baselineShift?: number | string;
        baseProfile?: number | string;
        bbox?: number | string;
        begin?: number | string;
        bias?: number | string;
        by?: number | string;
        calcMode?: number | string;
        capHeight?: number | string;
        clip?: number | string;
        clipPath?: string;
        clipPathUnits?: number | string;
        clipRule?: number | string;
        colorInterpolation?: number | string;
        colorInterpolationFilters?: "auto" | "sRGB" | "linearRGB" | "inherit";
        colorProfile?: number | string;
        colorRendering?: number | string;
        contentScriptType?: number | string;
        contentStyleType?: number | string;
        cursor?: number | string;
        cx?: number | string;
        cy?: number | string;
        d?: string;
        decelerate?: number | string;
        descent?: number | string;
        diffuseConstant?: number | string;
        direction?: number | string;
        display?: number | string;
        divisor?: number | string;
        dominantBaseline?: number | string;
        dur?: number | string;
        dx?: number | string;
        dy?: number | string;
        edgeMode?: number | string;
        elevation?: number | string;
        enableBackground?: number | string;
        end?: number | string;
        exponent?: number | string;
        externalResourcesRequired?: number | string;
        fill?: string;
        fillOpacity?: number | string;
        fillRule?: "nonzero" | "evenodd" | "inherit";
        filter?: string;
        filterRes?: number | string;
        filterUnits?: number | string;
        floodColor?: number | string;
        floodOpacity?: number | string;
        focusable?: number | string;
        fontFamily?: string;
        fontSize?: number | string;
        fontSizeAdjust?: number | string;
        fontStretch?: number | string;
        fontStyle?: number | string;
        fontVariant?: number | string;
        fontWeight?: number | string;
        format?: number | string;
        from?: number | string;
        fx?: number | string;
        fy?: number | string;
        g1?: number | string;
        g2?: number | string;
        glyphName?: number | string;
        glyphOrientationHorizontal?: number | string;
        glyphOrientationVertical?: number | string;
        glyphRef?: number | string;
        gradientTransform?: string;
        gradientUnits?: string;
        hanging?: number | string;
        horizAdvX?: number | string;
        horizOriginX?: number | string;
        href?: string;
        ideographic?: number | string;
        imageRendering?: number | string;
        in2?: number | string;
        in?: string;
        intercept?: number | string;
        k1?: number | string;
        k2?: number | string;
        k3?: number | string;
        k4?: number | string;
        k?: number | string;
        kernelMatrix?: number | string;
        kernelUnitLength?: number | string;
        kerning?: number | string;
        keyPoints?: number | string;
        keySplines?: number | string;
        keyTimes?: number | string;
        lengthAdjust?: number | string;
        letterSpacing?: number | string;
        lightingColor?: number | string;
        limitingConeAngle?: number | string;
        local?: number | string;
        markerEnd?: string;
        markerHeight?: number | string;
        markerMid?: string;
        markerStart?: string;
        markerUnits?: number | string;
        markerWidth?: number | string;
        mask?: string;
        maskContentUnits?: number | string;
        maskUnits?: number | string;
        mathematical?: number | string;
        mode?: number | string;
        numOctaves?: number | string;
        offset?: number | string;
        opacity?: number | string;
        operator?: number | string;
        order?: number | string;
        orient?: number | string;
        orientation?: number | string;
        origin?: number | string;
        overflow?: number | string;
        overlinePosition?: number | string;
        overlineThickness?: number | string;
        paintOrder?: number | string;
        panose1?: number | string;
        pathLength?: number | string;
        patternContentUnits?: string;
        patternTransform?: number | string;
        patternUnits?: string;
        pointerEvents?: number | string;
        points?: string;
        pointsAtX?: number | string;
        pointsAtY?: number | string;
        pointsAtZ?: number | string;
        preserveAlpha?: number | string;
        preserveAspectRatio?: string;
        primitiveUnits?: number | string;
        r?: number | string;
        radius?: number | string;
        refX?: number | string;
        refY?: number | string;
        renderingIntent?: number | string;
        repeatCount?: number | string;
        repeatDur?: number | string;
        requiredExtensions?: number | string;
        requiredFeatures?: number | string;
        restart?: number | string;
        result?: string;
        rotate?: number | string;
        rx?: number | string;
        ry?: number | string;
        scale?: number | string;
        seed?: number | string;
        shapeRendering?: number | string;
        slope?: number | string;
        spacing?: number | string;
        specularConstant?: number | string;
        specularExponent?: number | string;
        speed?: number | string;
        spreadMethod?: string;
        startOffset?: number | string;
        stdDeviation?: number | string;
        stemh?: number | string;
        stemv?: number | string;
        stitchTiles?: number | string;
        stopColor?: string;
        stopOpacity?: number | string;
        strikethroughPosition?: number | string;
        strikethroughThickness?: number | string;
        string?: number | string;
        stroke?: string;
        strokeDasharray?: string | number;
        strokeDashoffset?: string | number;
        strokeLinecap?: "butt" | "round" | "square" | "inherit";
        strokeLinejoin?: "miter" | "round" | "bevel" | "inherit";
        strokeMiterlimit?: number | string;
        strokeOpacity?: number | string;
        strokeWidth?: number | string;
        surfaceScale?: number | string;
        systemLanguage?: number | string;
        tableValues?: number | string;
        targetX?: number | string;
        targetY?: number | string;
        textAnchor?: string;
        textDecoration?: number | string;
        textLength?: number | string;
        textRendering?: number | string;
        to?: number | string;
        transform?: string;
        u1?: number | string;
        u2?: number | string;
        underlinePosition?: number | string;
        underlineThickness?: number | string;
        unicode?: number | string;
        unicodeBidi?: number | string;
        unicodeRange?: number | string;
        unitsPerEm?: number | string;
        vAlphabetic?: number | string;
        values?: string;
        vectorEffect?: number | string;
        version?: string;
        vertAdvY?: number | string;
        vertOriginX?: number | string;
        vertOriginY?: number | string;
        vHanging?: number | string;
        vIdeographic?: number | string;
        viewBox?: string;
        viewTarget?: number | string;
        visibility?: number | string;
        vMathematical?: number | string;
        widths?: number | string;
        wordSpacing?: number | string;
        writingMode?: number | string;
        x1?: number | string;
        x2?: number | string;
        x?: number | string;
        xChannelSelector?: string;
        xHeight?: number | string;
        xlinkActuate?: string;
        xlinkArcrole?: string;
        xlinkHref?: string;
        xlinkRole?: string;
        xlinkShow?: string;
        xlinkTitle?: string;
        xlinkType?: string;
        xmlBase?: string;
        xmlLang?: string;
        xmlns?: string;
        xmlnsXlink?: string;
        xmlSpace?: string;
        y1?: number | string;
        y2?: number | string;
        y?: number | string;
        yChannelSelector?: string;
        z?: number | string;
        zoomAndPan?: string;
    }

    interface WebViewHTMLAttributes<T> extends HTMLAttributes<T> {
        allowFullScreen?: boolean;
        allowpopups?: boolean;
        autoFocus?: boolean;
        autosize?: boolean;
        blinkfeatures?: string;
        disableblinkfeatures?: string;
        disableguestresize?: boolean;
        disablewebsecurity?: boolean;
        guestinstance?: string;
        httpreferrer?: string;
        nodeintegration?: boolean;
        partition?: string;
        plugins?: boolean;
        preload?: string;
        src?: string;
        useragent?: string;
        webpreferences?: string;
    }

    //
    // React.DOM
    // ----------------------------------------------------------------------

    interface ReactHTML {
        a: DetailedHTMLFactory<AnchorHTMLAttributes<HTMLAnchorElement>, HTMLAnchorElement>;
        abbr: DetailedHTMLFactory<HTMLAttributes<HTMLElement>, HTMLElement>;
        address: DetailedHTMLFactory<HTMLAttributes<HTMLElement>, HTMLElement>;
        area: DetailedHTMLFactory<AreaHTMLAttributes<HTMLAreaElement>, HTMLAreaElement>;
        article: DetailedHTMLFactory<HTMLAttributes<HTMLElement>, HTMLElement>;
        aside: DetailedHTMLFactory<HTMLAttributes<HTMLElement>, HTMLElement>;
        audio: DetailedHTMLFactory<AudioHTMLAttributes<HTMLAudioElement>, HTMLAudioElement>;
        b: DetailedHTMLFactory<HTMLAttributes<HTMLElement>, HTMLElement>;
        base: DetailedHTMLFactory<BaseHTMLAttributes<HTMLBaseElement>, HTMLBaseElement>;
        bdi: DetailedHTMLFactory<HTMLAttributes<HTMLElement>, HTMLElement>;
        bdo: DetailedHTMLFactory<HTMLAttributes<HTMLElement