/**
 * SSR-safe HTMLElement base.
 *
 * On a server (no DOM) `HTMLElement` is undefined, so `class X extends
 * HTMLElement` throws a ReferenceError at module-evaluation time — which crashes
 * any framework that imports the player during SSR (Next.js RSC, Nuxt,
 * SvelteKit). Fall back to a no-op stand-in there so the package can be imported
 * without throwing. The classes are never instantiated on the server because
 * custom-element registration is separately guarded to a no-op when
 * `customElements` is unavailable.
 */
export declare const HTMLElementBase: typeof HTMLElement;
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