/** Style id -> (definition, parent style id). */
export declare class StyleChains<D> {
    private readonly raw;
    insert(id: string, def: D, parent: string | undefined): void;
    definition(id: string): D | undefined;
    /**
     * Walk a chain child-to-root. Unknown ids end the walk; a cycle hard-fails.
     */
    walk<T>(id: string, visit: (def: D) => T | undefined): T | undefined;
}