/**
 * Sidecar metadata for a semantic index store.
 *
 * The Rust store (manifest.json/ids.json/vectors.bin) only knows vector ids;
 * this sidecar (index-meta.json, written next to the store) tracks the source
 * side: per-file freshness (mtime+size, content hash recomputed only when they
 * change) and each file's chunk line-ranges so search hits can be rendered as
 * `path:start-end`. It also pins the chunker version and embedding model id —
 * a mismatch on either triggers a clean rebuild instead of an inconsistent
 * incremental update.
 */
export interface FileMeta {
    mtimeMs: number;
    size: number;
    /** SHA-256 of content, hex. Recomputed only when mtime/size differ. */
    hash: string;
    /** Per-chunk 1-based inclusive [start, end] line ranges; index = chunk number. */
    chunks: Array<[number, number]>;
}
export interface IndexMeta {
    formatVersion: number;
    chunkerVersion: number;
    modelId: string;
    /** Absolute repo root this index was built from. */
    repoRoot: string;
    /** Last time this index was opened (ms). Enables later GC of dead stores. */
    lastUsedMs: number;
    files: Record<string, FileMeta>;
}
/** Directory holding the vector store + sidecar for `repoRoot`. */
export declare function getEmbsearchStoreDir(repoRoot: string): string;
/** Subdirectory the Rust store lives in (sidecar sits next to it). */
export declare function getVectorStoreDir(storeDir: string): string;
export declare function emptyIndexMeta(repoRoot: string, modelId: string): IndexMeta;
/**
 * Load the sidecar. Returns undefined when absent, unreadable, or built with a
 * different format/chunker/model — callers treat all of those as "rebuild".
 */
export declare function loadIndexMeta(storeDir: string, modelId: string): IndexMeta | undefined;
/** Atomically persist the sidecar (temp + rename, matching the Rust store). */
export declare function saveIndexMeta(storeDir: string, meta: IndexMeta): void;
export declare function hashContent(content: string): string;
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