import * as OBC from '@thatopen/components';
/**
 * Announces that something changed element visibility in the 3D view.
 *
 * `OBC.Hider` has no events, so a panel that hides something has no way to tell
 * the others. Without this, hiding a class in the IFC class list left the
 * spatial tree's switches showing stale state until its own data happened to
 * change — and the same for the default-hidden classes applied at load time,
 * which run after the panels have already read visibility.
 *
 * Everything that mutates visibility goes through `lib/bimItemActions`, which
 * fires this; the trees subscribe and re-read from the scene.
 */
export declare class VisibilityState extends OBC.Component {
    static readonly uuid: "9d41e7b8-2c60-4f13-8a75-6e0b3d95c22f";
    enabled: boolean;
    readonly onChanged: OBC.Event<void>;
    constructor(components: OBC.Components);
    notify(): void;
}
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