/**
 * @license
 * Copyright 2026 Steven Roussey <sroussey@gmail.com>
 * SPDX-License-Identifier: Apache-2.0
 */
import React from "react";
import type { RunViewportPlan } from "../model/runViewport";
/**
 * How many siblings each list may draw, decided once for the whole run.
 *
 * A list cannot work this out for itself: the answer depends on what every
 * other list is drawing, and React hands a component its own subtree and
 * nothing else. The run computes one plan from the census, publishes it here,
 * and each list reads its own line off it — which is also what makes the
 * decision testable without a terminal.
 */
export declare function RunViewportProvider({ plan, slot, }: {
    readonly plan: RunViewportPlan;
    readonly slot: React.ReactNode;
}): React.ReactElement;
export declare function useRunViewportPlan(): RunViewportPlan;
/**
 * The rows one list draws and the ones it is holding back. A list outside any
 * plan — the census has not caught up with a subgraph that just appeared —
 * falls back to the fixed cap, so a new list is briefly generous rather than
 * briefly empty.
 */
export declare function useVisibleRows<T>(listKey: string, rows: readonly T[]): {
    readonly visible: readonly T[];
    readonly hidden: readonly T[];
};