export interface ChartViewportSize {
    width: number;
    height: number;
}
/**
 * Keeps SVG chart geometry matched to the rendered SVG viewport.
 *
 * Cartesian charts intentionally render without a viewBox: changing the host
 * reflows plot geometry instead of scaling its strokes, text, radii, or points.
 */
export declare class ChartViewportController {
    private readonly target;
    private readonly onResize;
    private resizeObserver;
    constructor(target: Element, onResize: (size: ChartViewportSize) => void);
    connect(): void;
    measure(): void;
    disconnect(): void;
    private update;
}
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