import { Viewport } from '../../Entities/Viewport.js';
import { CadDocumentBuilder } from '../CadDocumentBuilder.js';
import { CadEntityTemplateT } from './CadEntityTemplate.js';
export declare class CadViewportTemplate extends CadEntityTemplateT<Viewport> {
    viewportHeaderHandle: number | null;
    boundaryHandle: number | null;
    namedUcsHandle: number | null;
    baseUcsHandle: number | null;
    visualStyleHandle: number | null;
    viewportId: number | null;
    blockHandle: number | null;
    frozenLayerHandles: Set<number>;
    constructor(entity?: Viewport);
    protected _build(builder: CadDocumentBuilder): void;
}
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