/**
 * Extracts metadata from pure YAML memory files for lightweight indexing.
 *
 * Memory files differ from other elements: they are pure YAML (not markdown
 * with frontmatter). Metadata lives under a top-level `metadata` key or
 * directly as top-level keys. This extractor reads raw YAML and returns
 * the subset of fields needed for ElementIndexEntry without constructing
 * a full Memory object.
 */
import type { ElementIndexEntry } from './types.js';
export declare class MemoryMetadataExtractor {
    /**
     * Align with the memory save/load limit (256KB). Issue #2329: this was 64KB,
     * so memories that grew past it indexed as 'unnamed' with default metadata.
     */
    private static readonly MAX_YAML_SIZE;
    /**
     * Extract index-relevant metadata from raw YAML memory content.
     *
     * @param rawContent - Full YAML file content
     * @param relativePath - Path relative to the memories element directory
     * @returns Partial ElementIndexEntry with extracted fields
     */
    static extractMetadata(rawContent: string, relativePath: string): Partial<ElementIndexEntry>;
    /**
     * Infer the memory type from the file's relative path.
     *
     * @param relativePath - Path relative to the memories directory
     * @returns 'system' | 'adapter' | 'user'
     */
    static inferMemoryType(relativePath: string): string;
    /**
     * Extract YAML content between --- frontmatter markers.
     * Returns null if no valid frontmatter block found.
     */
    private static extractFrontmatter;
    /**
     * Parse raw YAML using the centralized secure parser.
     * Returns parse diagnostics so callers can fail closed while preserving error context.
     */
    private static tryParseYamlObject;
    /** Return a minimal default entry for empty/corrupt content. */
    private static defaultEntry;
    private static normalizeText;
}
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