/**
 * YAML frontmatter → Meta callout (opt-in via --frontmatter-as-callout).
 *
 * Parses a leading `---\n…\n---` block as a minimal YAML subset and renders
 * a blockquote "Meta" callout that lark-hirono's normalize pass later
 * converts to a Feishu callout.
 *
 * Supported value forms: bare string, quoted string, ISO date, flow-style
 * array (`[a, b, c]`). Block-style arrays and nested maps are rejected
 * with a clear error — consumers with richer frontmatter should
 * preprocess it themselves.
 */
export interface ParsedFrontmatter {
    /** Document body with the `---…---` block stripped. */
    body: string;
    /** Rendered Meta callout (blockquote) — null when no frontmatter was present. */
    callout: string | null;
    /** Raw key/value pairs in parse order. */
    data: Record<string, string | string[]>;
}
/**
 * Parse a leading YAML frontmatter block.
 *
 * If no frontmatter is present: returns `{ body: md, callout: null, data: {} }`.
 * If malformed (block-style list, nested map, non-`key: value` line): throws.
 */
export declare function parseFrontmatter(md: string): ParsedFrontmatter;
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