/** @packageDocumentation ID3v2 unknown frame fallback. Preserves the raw payload of frame types without a dedicated parser. */
import { ByteVector } from "../../../byteVector.js";
import { Id3v2Frame, Id3v2FrameHeader } from "../id3v2Frame.js";
/**
 * Unknown frame – used for any frame type that we don't have a specific parser for.
 */
export declare class UnknownFrame extends Id3v2Frame {
    /** Raw payload bytes of the unknown frame, preserved verbatim. */
    private _data;
    /**
     * Creates a new unknown frame with the given frame ID and optional payload.
     * @param frameId - The four-byte frame ID identifying the frame type.
     * @param data - The raw payload bytes. Defaults to an empty {@link ByteVector}.
     */
    constructor(frameId: ByteVector, data?: ByteVector);
    /**
     * Returns the raw frame payload bytes.
     * @returns A {@link ByteVector} containing the unparsed frame data.
     */
    get data(): ByteVector;
    /**
     * Returns the frame ID as a Latin1 string.
     * @returns The four-character frame ID string.
     */
    toString(): string;
    /** @internal Create from raw frame data. */
    static fromData(data: ByteVector, header: Id3v2FrameHeader, version: number): UnknownFrame;
    /**
     * Stores the raw frame payload for later rendering.
     * @param data - The raw field bytes of the frame.
     * @param _version - The ID3v2 version (unused).
     */
    protected parseFields(data: ByteVector, _version: number): void;
    /**
     * Returns the preserved raw payload bytes unchanged.
     * @param _version - The ID3v2 version (unused).
     * @returns The raw {@link ByteVector} payload of this frame.
     */
    protected renderFields(_version: number): ByteVector;
}
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