/** Base custom element class with reactive effect lifecycle, child deferral, and trait protocol. */
export declare class NativeElement extends HTMLElement {
    #private;
    /** @internal Suppress lifecycle during synchronous reparenting (e.g. PresentController). */
    _reparenting: boolean;
    constructor();
    /** Resolves after setup() and any deferChildren callbacks have completed. Renews on reconnect. */
    get ready(): Promise<void>;
    addEffect(fn: () => void): void;
    connectedCallback(): void;
    disconnectedCallback(): void;
    setup(): void;
    teardown(): void;
    protected deferChildren(fn: () => void): void;
    /** @internal Renew the ready promise. Called by NController which overrides connectedCallback. */
    protected renewReady(): void;
    attributeChangedCallback(_name: string, _old: string | null, _val: string | null): void;
    /**
     * Get a trait controller instance by name.
     * Returns null if no controller with that name is active.
     */
    getTraitController<T>(name: string): T | null;
}
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