/**
 * memory-journal-mcp — Frontmatter Parser & Serializer
 *
 * Hand-rolled YAML frontmatter parser (~100 lines) for zero-dependency
 * markdown interoperability. Supports scalar values, string arrays,
 * and object arrays (for relationships).
 *
 * Design rationale: Avoids adding a YAML parsing dependency (js-yaml,
 * yaml, etc.) to keep supply-chain surface minimal. The subset of YAML
 * used by MJ frontmatter is simple enough to parse with line splitting.
 */
/** Parsed frontmatter data structure */
export interface FrontmatterData {
    mj_id?: number;
    entry_type?: string;
    author?: string;
    tags?: string[];
    timestamp?: string;
    significance?: string;
    relationships?: {
        type: string;
        target_id: number;
    }[];
    source?: string;
}
/** Result of parsing a frontmattered markdown file */
export interface ParseResult {
    metadata: FrontmatterData;
    body: string;
}
/**
 * Serialize frontmatter data into a JSON frontmatter block.
 * Output: `---\n{\n  "key": "value"\n}\n---\n`
 */
export declare function serializeFrontmatter(data: FrontmatterData | null | undefined): string;
/**
 * Parse a markdown file with YAML frontmatter.
 *
 * - First line must be `---`
 * - Frontmatter ends at the next `---` line
 * - Supports: scalar values, string arrays (`- item`), relationship objects
 * - Returns validated metadata + body content
 *
 * @throws Error if frontmatter is malformed or fails validation
 */
export declare function parseFrontmatter(content: string): ParseResult;
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