import type { MemoryTier, MemoryType, MemoryUnit, Frontmatter } from "./types.js";
export declare function parseFrontmatter(content: string): {
    meta: Frontmatter;
    body: string;
};
export declare function estimateTokens(content: string): number;
export declare function inferTypeFromPath(relPath: string): MemoryType;
export declare function inferTierFromPath(relPath: string, type: MemoryType): MemoryTier;
export declare function extractTagsFromContent(body: string): string[];
export declare function extractSummary(body: string): string;
/**
 * Read a single markdown file from disk and build a MemoryUnit.
 * Returns null if the file cannot be read.
 */
export declare function registerFile(absPath: string, relPath: string): MemoryUnit | null;
/**
 * Recursively scan a directory for .md files (skipping INDEX.md).
 * Returns a map of relPath → MemoryUnit for all successfully registered files.
 */
export declare function scanDirectory(absDir: string, relDir: string, fs: typeof import("fs"), path: typeof import("path")): Map<string, MemoryUnit>;
/**
 * Scan the memory root directory and return all discovered MemoryUnits.
 * Returns an empty map if fs/path are unavailable or root doesn't exist.
 */
export declare function scanRoot(root: string): Map<string, MemoryUnit>;
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