import * as React from 'react';
declare type ReactEventResponder<E, C> = {
    $$typeof: Symbol | number;
    displayName: string;
    targetEventTypes: null | string[];
    rootEventTypes: null | string[];
    getInitialState: null | ((props: Object) => Object);
    onEvent: null | ((event: E, context: C, props: Object, state: Object) => void);
    onRootEvent: null | ((event: E, context: C, props: Object, state: Object) => void);
    onMount: null | ((context: C, props: Object, state: Object) => void);
    onUnmount: null | ((context: C, props: Object, state: Object) => void);
};
declare type ReactEventResponderInstance<E, C> = {
    fiber: Object;
    props: Object;
    responder: ReactEventResponder<E, C>;
    rootEventTypes: null | Set<string>;
    state: Object;
};
export declare type HookType = 'useState' | 'useReducer' | 'useContext' | 'useRef' | 'useEffect' | 'useLayoutEffect' | 'useCallback' | 'useMemo' | 'useImperativeHandle' | 'useDebugValue' | 'useResponder';
declare type ReactProviderType<T> = {
    $$typeof: Symbol | number;
    _context: ReactContext<T>;
};
declare type ReactContext<T> = {
    $$typeof: Symbol | number;
    Consumer: ReactContext<T>;
    Provider: ReactProviderType<T>;
    _calculateChangedBits: ((a: T, b: T) => number) | null;
    _currentValue: T;
    _currentValue2: T;
    _threadCount: number;
    _currentRenderer?: Object | null;
    _currentRenderer2?: Object | null;
};
declare type ContextDependency<T> = {
    context: ReactContext<T>;
    observedBits: number;
    next: ContextDependency<any> | null;
};
declare enum WorkTag {
    FunctionComponent = 0,
    ClassComponent = 1,
    IndeterminateComponent = 2,
    HostRoot = 3,
    HostPortal = 4,
    HostComponent = 5,
    HostText = 6,
    Fragment = 7,
    Mode = 8,
    ContextConsumer = 9,
    ContextProvider = 10,
    ForwardRef = 11,
    Profiler = 12,
    SuspenseComponent = 13,
    MemoComponent = 14,
    SimpleMemoComponent = 15,
    LazyComponent = 16,
    IncompleteClassComponent = 17,
    DehydratedFragment = 18,
    SuspenseListComponent = 19,
    FundamentalComponent = 20,
    ScopeComponent = 21
}
declare type Source = {
    fileName: string;
    lineNumber: number;
};
declare type ExpirationTime = number;
declare type Dependencies = {
    expirationTime: ExpirationTime;
    firstContext: ContextDependency<any> | null;
    responders: Map<ReactEventResponder<any, any>, ReactEventResponderInstance<any, any>> | null;
};
export declare type Fiber = {
    tag: WorkTag;
    key: null | string;
    elementType: any;
    type: any;
    stateNode: any;
    return: Fiber | null;
    child: Fiber | null;
    sibling: Fiber | null;
    index: number;
    ref: React.Ref<any>;
    pendingProps: any;
    memoizedProps: any;
    memoizedState: any;
    dependencies: Dependencies | null;
    nextEffect: Fiber | null;
    firstEffect: Fiber | null;
    lastEffect: Fiber | null;
    expirationTime: ExpirationTime;
    childExpirationTime: ExpirationTime;
    alternate: Fiber | null;
    actualDuration?: number;
    actualStartTime?: number;
    selfBaseDuration?: number;
    treeBaseDuration?: number;
    _debugID?: number;
    _debugSource?: Source | null;
    _debugOwner?: Fiber | null;
    _debugIsCurrentlyTiming?: boolean;
    _debugNeedsRemount?: boolean;
    _debugHookTypes?: HookType[] | null;
};
export declare function getReactFiberFromNode(elm: Node | undefined): Fiber | null;
export {};