/**
 * Compute a SHA-256 hash of the given content.
 * Used for incremental indexing — only re-embed files whose hash has changed.
 */
declare function hashContent(content: string): string;

interface FileEntry {
    /** File path relative to repo root. */
    filePath: string;
    /** SHA-256 content hash. */
    contentHash: string;
    /** Optional: IDs of chunks generated from this file. */
    chunkIds?: string[];
}
interface ChangedFiles {
    /** Files that are new (not in old set). */
    added: string[];
    /** Files that exist in both but have different content hashes. */
    modified: string[];
    /** Files that were in old set but not in new set. */
    deleted: string[];
    /** Files that are unchanged. */
    unchanged: string[];
}
/** Mapping from file extension to tree-sitter grammar name. */
interface GrammarMapping {
    extension: string;
    language: string;
    treeSitterGrammar: string;
}

/**
 * Compare old and new file entry lists to determine which files were
 * added, modified, deleted, or unchanged.
 *
 * Uses content hashes for comparison — two files with identical content
 * are considered unchanged even if their metadata differs.
 */
declare function resolveChanges(oldEntries: FileEntry[], newEntries: FileEntry[]): ChangedFiles;

declare const INDEXABLE_EXTENSIONS: Set<string>;
declare function shouldIndexFile(path: string, size: number): boolean;
/** Languages that have tree-sitter grammar support for AST chunking. */
declare const AST_SUPPORTED_LANGUAGES: Set<string>;
declare function detectLanguage(path: string): string;
/**
 * Get the tree-sitter grammar name for a file extension.
 * Returns empty string if no grammar is available (falls back to line chunker).
 */
declare function getTreeSitterGrammar(path: string): string;

export { AST_SUPPORTED_LANGUAGES, type ChangedFiles, type FileEntry, type GrammarMapping, INDEXABLE_EXTENSIONS, detectLanguage, getTreeSitterGrammar, hashContent, resolveChanges, shouldIndexFile };