/**
 * One editor's live-screen holds: the budget, the page ids holding a slot in
 * recency order, and the listeners frames subscribe through. The bodies below
 * are the former module-level functions, closed over instance state instead
 * of module state. Every runtime owns one.
 */
/** How many frames render live unless the host says otherwise. */
export declare const DEFAULT_LIVE_SCREEN_BUDGET = 3;
/**
 * The most instances a screen-state group may hold at once. The budget
 * follows the active group's size up to here so every variant of a small
 * group stays booted and a switch between them is instant; a larger group
 * keeps its most recently used variants live.
 */
export declare const LIVE_SCREEN_GROUP_BUDGET_CAP = 5;
export declare function createLiveScreens(): {
    subscribeLiveScreens: (listener: () => void) => () => void;
    setLiveScreenBudget: (next: number) => void;
    setLiveScreenGroupSize: (next: number) => void;
    getEffectiveLiveScreenBudget: () => number;
    setLiveScreenCandidates: (next: readonly string[]) => void;
    getLiveScreenBudget: () => number;
    requestLiveScreen: (pageId: string) => boolean;
    releaseLiveScreen: (pageId: string) => void;
    holdsLiveScreen: (pageId: string) => boolean;
    liveScreenHolders: () => readonly string[];
    resetLiveScreens: () => void;
};
export type LiveScreens = ReturnType<typeof createLiveScreens>;