export declare function registerRainbowProperty(): void; export declare function registerShineProperty(): void; /** * Rainbow Border Effect Mixin * * Animated rainbow border with glow effect. * Perfect for highlighting call-to-action elements or special features. * * @param selector - CSS selector for the element carrying the border, matched * against the component's actual shadow DOM markup — a bare word like * 'button' is a TYPE selector (matches a literal `