import * as React from 'react';
/**
 * Items are keyed by a stable object identity rather than an element: React
 * Native has no `Element` to use as a map key.
 */
export type CompositeItemKey = object;
export interface CompositeItemLayout {
    x: number;
    y: number;
    width: number;
    height: number;
}
export type CompositeMetadata<CustomMetadata> = {
    index?: number | null | undefined;
    layout?: CompositeItemLayout | undefined;
} & CustomMetadata;
export interface CompositeListContext<Metadata = any> {
    register: (key: CompositeItemKey, metadata: Metadata) => void;
    unregister: (key: CompositeItemKey) => void;
    setItemLayout: (key: CompositeItemKey, layout: CompositeItemLayout) => void;
    subscribeMapChange: (fn: (map: Map<CompositeItemKey, CompositeMetadata<Metadata>>) => void) => () => void;
}
export declare const CompositeListContext: React.Context<CompositeListContext<any> | undefined>;
export declare function useCompositeListContext<Metadata = any>(): CompositeListContext<Metadata>;
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