export type SrcsetCandidate = {
    url: string;
    width?: number;
    density?: number;
};
/** Parse a comma-separated `srcset` attribute into URL + descriptor pairs. */
export declare function parseSrcset(srcset: string): SrcsetCandidate[];
/** Pick the `src` fallback the UA should use for a given `srcset`. */
export declare function resolveImageFallbackSrc(src: string, srcset: string): string;