export interface FileEntry {
    absolutePath: string;
    relativePath: string;
    language: string;
    module: string;
    lastModified: string;
}
export declare function walkFiles(): Promise<FileEntry[]>;
export interface IndexState {
    lastIndexedAt: string;
    fileHashes: Record<string, string>;
}
export declare function loadIndexState(): IndexState | null;
export declare function saveIndexState(state: IndexState): void;
export declare function getChangedFiles(files: FileEntry[], state: IndexState | null): {
    toIndex: FileEntry[];
    toDelete: string[];
};
/**
 * Every path whose existing chunks must be deleted before an incremental upsert: removed
 * files AND changed files. Chunk ids are hash(path:startLine), so an upsert only replaces a
 * chunk whose start line did not move — without clearing a changed file first, every edit
 * that shifts a chunk boundary leaves the old chunk in the collection forever.
 */
export declare function pathsToClear(changes: {
    toIndex: FileEntry[];
    toDelete: string[];
}): string[];