export interface RimRenderer {
    /** Corner radius, in CSS px, matching the `radius` attribute. */
    setRadius(radius: number): void;
    /** Tears down whichever backend is active and removes its canvas(es). */
    destroy(): void;
}
/**
 * Mounts the rim canvas(es) into `container` (the `.ran-glass-specular` div)
 * and keeps them sized to it via `ResizeObserver`. Always returns a working
 * renderer object — even when neither backend is available the returned
 * object is just inert (its canvas stays blank, so the plain CSS specular
 * gradient remains the only highlight; there's nothing for the caller to
 * branch on).
 */
export declare function createRimRenderer(container: HTMLElement): RimRenderer;