/**
 * Delta Encoding with Varint for Neighbor Lists
 *
 * Implements delta-encoded neighbor lists as used by Qdrant for ~38% storage reduction.
 * Neighbor IDs are sorted, then stored as deltas with variable-length encoding.
 *
 * Format:
 * - First ID stored as full uint32
 * - Subsequent IDs stored as varint deltas from previous ID
 *
 * Varint encoding (like Protocol Buffers):
 * - Values 0-127: 1 byte
 * - Values 128-16383: 2 bytes
 * - Values 16384-2097151: 3 bytes
 * - Values 2097152-268435455: 4 bytes
 * - Larger: 5 bytes
 */
/**
 * Encode an unsigned integer as a varint
 * Returns the number of bytes written
 */
export declare function encodeVarint(value: number, buffer: Uint8Array, offset: number): number;
/**
 * Decode a varint from buffer
 * Returns [value, bytesRead]
 */
export declare function decodeVarint(buffer: Uint8Array, offset: number): [number, number];
/**
 * Calculate the number of bytes needed to encode a varint
 */
export declare function varintSize(value: number): number;
/**
 * Delta-encode a sorted array of neighbor IDs
 * Returns the encoded buffer
 */
export declare function deltaEncodeNeighbors(neighbors: number[], preSorted?: boolean): Uint8Array;
/**
 * Decode a delta-encoded neighbor list
 * Returns the original neighbor IDs (sorted)
 */
export declare function deltaDecodeNeighbors(buffer: Uint8Array, count: number): number[];
/**
 * Calculate the encoded size for a neighbor list without actually encoding
 * Useful for calculating total buffer size before serialization
 */
export declare function deltaEncodedSize(neighbors: number[], preSorted?: boolean): number;
/**
 * Batch encode multiple neighbor lists efficiently
 * Returns a single buffer with all encoded lists concatenated
 * Also returns offsets for each list
 */
export declare function deltaEncodeBatch(neighborLists: number[][]): {
    buffer: Uint8Array;
    offsets: number[];
    sizes: number[];
};
/**
 * Decode a batch of neighbor lists from a single buffer
 */
export declare function deltaDecodeBatch(buffer: Uint8Array, offsets: number[], sizes: number[], counts: number[]): number[][];
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