import type { PcktImageBlock } from "./types.js";
/** Build a Bluesky CDN image URL for a pckt image blob, or return an external
 *  `https:` src unchanged. Returns null when no source can be resolved. */
export declare function pcktImageUrl(block: PcktImageBlock, did: string): string | null;
/** Width ÷ height for layout; falls back to 16∶9 when missing or invalid. */
export declare function pcktImageAspectRatio(block: PcktImageBlock): number;
export declare function pcktImageAlign(block: PcktImageBlock): "left" | "center" | "right" | undefined;
export declare function pcktImageAlt(block: PcktImageBlock): string;
/** True when attrs contain enough data to attempt rendering. */
export declare function pcktImageHasSource(block: PcktImageBlock): boolean;
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