import type { PcktCodeBlock, PcktContent, PcktRenderableBlock, PcktTextBlock } from "./types.js";
export declare function asTextBlock(value: unknown): PcktTextBlock | null;
/**
 * True when the content's first block is a heading whose text exactly matches
 * the document description. pckt authors often open a post with the description
 * as an H1; in that case the reader drops the heading from the body (it would
 * duplicate the header) and instead shows the description as the header dek.
 * Both the body renderer and the dek-visibility check use this predicate so
 * they stay in agreement.
 */
export declare function pcktLeadingHeadingMatchesDescription(content: unknown, description: string | null | undefined): boolean;
/** Every renderable block in document order. */
export declare function pcktBlocks(content: unknown): Array<PcktRenderableBlock>;
/** Plaintext lines contributed by a single pckt block (for reading-time ingest). */
export declare function plaintextLinesFromBlock(block: PcktRenderableBlock): Array<string>;
/** Normalize pckt code block language (may live in `attrs.language`). */
export declare function pcktCodeLanguage(block: PcktCodeBlock): string | undefined;
export declare function asPcktContent(content: unknown): PcktContent | null;
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