/** @packageDocumentation ID3v2 extended header parser (optional header section in ID3v2.3/2.4 tags). */
import { ByteVector } from "../../byteVector.js";
/**
 * ID3v2 extended header (optional, indicated by header flags).
 *
 * For v2.3: 4-byte big-endian size (excludes itself) + 2-byte flags + padding
 * For v2.4: 4-byte synchsafe size (includes itself) + 1-byte flag count + flags
 *
 * The C++ TagLib implementation always uses SynchData.toUInt for the size,
 * which also handles buggy software that writes normal big-endian integers.
 */
export declare class Id3v2ExtendedHeader {
    /** Total size of the extended header in bytes, as decoded from the stream. */
    private _size;
    /** Creates a new, empty extended header instance. */
    constructor();
    /**
     * Parse the extended header from data.
     *
     * @param data - The raw extended header bytes.
     * @param _version - The ID3v2 major version (3 or 4). Currently the C++
     *   implementation reads the first 4 bytes as a synchsafe integer
     *   regardless of version.
     */
    parse(data: ByteVector, _version: number): void;
    /** Total size of the extended header. */
    get size(): number;
}
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