/** First strictly positive dimension, else 0. Never invent a 1px axis — that becomes a 1:1 viewBox and blows up flex layout. */
export declare function viewBoxDimension(...values: (number | undefined)[]): number;
/**
 * Prefer measured contentRect when both axes are known; otherwise seed width/height
 * together from layout (wrapper size / computed height). Seed only when BOTH fallbacks
 * are positive — a single `1` placeholder gives the SVG a real aspect ratio (SSR
 * `height: NaNpx` + `viewBox="0 0 1 1"` → column-width square, body copy squeezed).
 * Do not use natural media dimensions here — that breaks fit-content images whose
 * box is still 0px wide.
 */
export declare function viewBoxSize(measured: {
    width?: number;
    height?: number;
} | null | undefined, fallbackWidth: number | undefined, fallbackHeight: number | undefined): [number, number];