/**
 * Resolve the class we can safely `extends`.
 * • In the browser → the real `HTMLElement`.
 * • During SSR / Node → a no-op stub so `class … extends …` is still valid.
 */
declare const HTMLElementBase: typeof HTMLElement;
/**
 * Universal base class for Courier web-components.
 *
 * ⚠️  IMPORTANT:  When you create a concrete element, extend **this**
 *     (or `HTMLElementBase`) instead of `HTMLElement` directly.
 */
export declare class CourierBaseElement extends HTMLElementBase {
    #private;
    /** Tag-name you’ll use in `customElements.define()` */
    static get id(): string;
    connectedCallback(): void;
    disconnectedCallback(): void;
    /** Called **once** when the element first becomes part of the DOM. */
    protected onComponentMounted(): void;
    /** Called when the element is removed from the DOM. */
    protected onComponentUnmounted(): void;
}
export {};