import { ByteVector } from "../byteVector";
/**
 * Represents the identifier of a frame, depending on the version this may be 3 or 4
 * bytes. Provides a simple way to switch between the identifiers used for different versions.
 *
 * @remarks
 *     This class is implemented in an attempt to unify frame identifiers, make it easy to
 *     switch versions, find frames between tags, and determine which frames are supported on which
 *     version of ID3v2.
 *     If you have a death wish, you can take your life into your own hands and construct your own
 *     FrameIdentifier for use in non-standard frames. This is VERY STRONGLY NOT ADVISED. Not only
 *     will you be breaking the ID3v2 standard making your frame not portable, but you will also
 *     have to ensure the FrameIdentifier instance you create is used everywhere the frame
 *     identifier is used.
 *     To make implementation and less memory intensive, FrameIdentifier instances for built-in
 *     frame identifiers are statically created and reused. This allows usage of the `===` to
 *     compare instances because they should always be the same.
 */
export declare class FrameIdentifier {
    private readonly _version2;
    private readonly _version3;
    private readonly _version4;
    /**
     * Constructs and initializes a new instance.
     * @param v4 Identifier string to use on ID3v2.4 tags. If not supplied, frame type is not valid
     *     for ID3v2.4 tags.
     * @param v3 Identifier string to use on ID3v2.3 tags. If not supplied, frame type is not valid
     *     for ID3v2.4 tags.
     * @param v2 Identifier string to use on ID3v2.2 tags. If not supplied, frame type is not valid
     *     for ID3v2.2 tags.
     */
    constructor(v4: string, v3: string, v2: string);
    /**
     * Whether the frame identifier indicates the frame is a text frame.
     */
    get isTextFrame(): boolean;
    /**
     * Whether the frame identifier indicates the frame is a URL frame.
     */
    get isUrlFrame(): boolean;
    /**
     * Renders the frame identifier by returning the identifier string for the specified ID3v2
     * version.
     * @param version Version of ID3v2 to render the current instance for
     * @throws NotSupportedError Thrown if the frame identifier does not contain a string for the
     *     provided ID3v2 version.
     */
    render(version: number): ByteVector;
    /**
     * Generates a string representation of the frame identifier.
     * @remarks
     *     This always returns the string for the newest version of ID3v2. Therefore, this method
     *     should only be used for diagnostic purposes, and not for generating file contents.
     */
    toString(): string;
}
/**
 * Collection of all well-known frame identifiers.
 */
export declare const FrameIdentifiers: {
    [key: string]: FrameIdentifier;
};