import type { Buffers, RegionKey } from '../memory/index.js';
export declare class SparseSetU32 {
    #private;
    constructor(buffers: Buffers, denseKey: RegionKey, sparseKey: RegionKey, initialCapacity: number, maxEntities: number);
    get size(): number;
    /** sparse[index] points into dense; the slot is valid iff dense[pos] === index AND pos < size. */
    has(index: number): boolean;
    /** O(1); idempotent (has-guarded so no dup). Grows the addressable space lazily. */
    add(index: number): void;
    /** O(1) swap-and-pop within dense. No-op if absent. */
    remove(index: number): void;
    clear(): void;
    /** Dense iteration over dense[0..size). Values are entity indices. */
    [Symbol.iterator](): Iterator<number>;
    /** A live view of the dense prefix [0..size) — zero-copy; callers must not mutate it. */
    denseView(): Uint32Array;
}
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