/**
 * Creates a tag data accessor for a target object of a certain type.
 * Tag data will be lazy created on access and reused for the same target object.
 *
 * @typeparam Target Target type.
 * @typeparam TagData Tag data type.
 * @param tagDataConstructor Function that will be called the first time the tag
 * for a given object is requested.
 * @returns The tag data associated with the target object.
 */
export declare function tag<Target extends object, TagData>(tagDataConstructor: (target: Target) => TagData): {
    for(target: Target): TagData;
};