/**
 * Extract function/class/method/variable names from a unified diff.
 *
 * Used by `dim context --diff` to tighten memory matching: instead of
 * searching by file path only, we also search by the symbols that were
 * actually changed in the diff.
 */
/**
 * Extract symbol names from added lines in a unified diff.
 * Returns unique, deduplicated symbol names (lowercased for matching).
 */
export declare function extractDiffSymbols(diff: string): string[];
/**
 * Extract symbols from a git diff between refs.
 */
export declare function gitDiffSymbols(repoRoot: string, base?: string, staged?: boolean): string[];