/**
 * Cascade Scheduler
 *
 * - Coalesces derivations into a single microtask.
 * - Tasks run once at their maximum rank via a ranked dirty queue.
 * - Doesn't retain snapshots or dependency graphs.
 * - Deferred listeners run after all derivations have settled.
 */
type Rank = number;
type Task = () => void;
export declare function isCascadeActive(): boolean;
/**
 * Rank of the currently running derive batch, or null if not in a batch.
 */
export declare function getCurrentDeriveRank(): Rank | null;
/**
 * Arms the cascade and schedules a single microtask flush.
 */
export declare function activateCascade(): void;
/**
 * Synchronously drains the active cascade.
 */
export declare function flushCascade(): void;
/**
 * Synchronously settles derivations without delivering deferred listeners.
 */
export declare function settleCascadeDerivations(): void;
/**
 * Enlist a deferred listener flush task.
 */
export declare function joinCascade(task: Task): void;
/**
 * Enqueue (or upgrade) a derive task with the given rank.
 * If the task is already present, its rank is upgraded and it is run later.
 */
export declare function enqueueDerive(task: Task, rank: Rank): void;
export {};
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