/**
 * Binary min-heap — used for k-way merge in compaction.
 * Compares entries by a provided key function.
 */
export declare class MinHeap<T> {
    private readonly data;
    private readonly cmp;
    constructor(cmp: (a: T, b: T) => number);
    get size(): number;
    push(item: T): void;
    peek(): T | undefined;
    pop(): T | undefined;
    private bubbleUp;
    private siftDown;
}
//# sourceMappingURL=heap.d.ts.map