export interface ExpiryHeapNode {
    key: string;
    expiresAt: number;
}
/**
 * Binary min-heap of cache-entry expiry times, ordered by `expiresAt`.
 *
 * Nodes are not removed when their entry is deleted or overwritten — callers
 * detect stale nodes by comparing the node against the live store and pop
 * them lazily.
 *
 * @internal
 */
export declare class ExpiryHeap {
    private _nodes;
    get length(): number;
    peek(): ExpiryHeapNode | undefined;
    push(key: string, expiresAt: number): void;
    pop(): ExpiryHeapNode | undefined;
    clear(): void;
    /** Replaces the heap contents with the given nodes and heapifies in place. */
    rebuild(nodes: ExpiryHeapNode[]): void;
    private _bubbleUp;
    private _bubbleDown;
}
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