import React from "react";
import type { MeasuredLayoutRegistry, MeasuredSlotSize } from "./types";
export type MeasuredLayoutContextValue = {
    sizes: MeasuredLayoutRegistry;
    setSlotSize: (slotId: string, size: MeasuredSlotSize) => void;
    clearSlotSize: (slotId: string) => void;
    getSlotSize: (slotId: string) => MeasuredSlotSize;
};
export type MeasuredLayoutProviderProps = {
    children: React.ReactNode;
    /** Optional initial sizes (useful in tests). */
    initialSizes?: MeasuredLayoutRegistry;
};
/**
 * Holds live measured sizes for named layout slots (fixed TopBar, BottomNav, etc.).
 * UI-only — no persistence or auth.
 */
export declare const MeasuredLayoutProvider: React.FunctionComponent<MeasuredLayoutProviderProps>;
export declare const useMeasuredLayoutContext: () => MeasuredLayoutContextValue;
/** Returns null outside a provider — safe for optional measure publishers. */
export declare const useOptionalMeasuredLayoutContext: () => MeasuredLayoutContextValue | null;
export default MeasuredLayoutProvider;