/**
 * Protobuf size calculation utilities for DAG-PB nodes.
 *
 * Computes exact serialized sizes matching @ipld/dag-pb's encoding
 * without allocating byte arrays. Used by DirFlat to avoid O(N)
 * re-serialization on every file insert.
 *
 * Ported from @ipld/dag-pb/src/pb-encode.js (sov, len64, sizeLink, sizeNode)
 * and boxo's directory.go estimatedSize logic.
 */
import type { Mtime } from 'ipfs-unixfs';
/**
 * Protobuf varint byte size, matching @ipld/dag-pb's sov().
 */
export declare function varintLen(x: number): number;
/**
 * Compute UTF-8 byte length of a JS string without allocation.
 *
 * Safe to assume UTF-8 because @ipld/dag-pb always encodes PBLink.Name
 * via TextEncoder (UTF-8) and decodes via TextDecoder (UTF-8).
 * This produces the same result as textEncoder.encode(str).length
 * without the Uint8Array allocation on every put() call.
 */
export declare function utf8ByteLength(str: string): number;
/**
 * Exact bytes a single PBLink adds to the PBNode encoding.
 *
 * Matches sizeLink() + its wrapper in sizeNode() from pb-encode.js:
 * linkLen = Hash(1+sov(cidLen)+cidLen) + Name(1+sov(nameLen)+nameLen) + Tsize(1+sov(tsize))
 * total   = 1 + sov(linkLen) + linkLen
 */
export declare function linkSerializedSize(nameByteLen: number, cidByteLength: number, tsize: number): number;
/**
 * Exact bytes the PBNode Data field adds for a UnixFS directory.
 *
 * Directory-only: the type field is hardcoded to directory (2 bytes) and
 * the default mode is 0o755. Do not use for file nodes (different type
 * byte, different default mode 0o644).
 *
 * For the common case (no mode, no mtime) this is always 4 bytes:
 * innerSize=2 [0x08,0x01], wrapper 1+1+2=4.
 */
export declare function dataFieldSerializedSize(mode?: number, mtime?: Mtime): number;
//# sourceMappingURL=pb-size.d.ts.map