/**
 * Split a string into lowercased word tokens, breaking camelCase, snake_case,
 * dots, slashes, and other separators.
 * @param {string} s
 * @returns {string[]}
 */
export function splitIdent(s: string): string[];
/**
 * Build the FTS5-indexed body for a file — the code-aware searchable surface (§5 mechanism 3).
 * Folds: (1) the file path, doubled, so filename matches count; (2) `extra` tokens (symbol names,
 * deps) the caller supplies; (3) the raw source, whose whole lowercased identifiers unicode61
 * indexes; (4) the camelCase supplement (see `camelParts`). Exact and descriptive queries both
 * land, closing the "sparse code loses to prose" gap.
 * @param {{ path: string, body: string, extra?: string[] }} doc
 * @returns {string}
 */
export function indexBody({ path, body, extra }: {
    path: string;
    body: string;
    extra?: string[];
}): string;
/**
 * Extract content keywords from a query: deduped, stopwords dropped, length >= 3.
 * @param {string} query
 * @returns {string[]}
 */
export function keywords(query: string): string[];
/**
 * Build an FTS5 MATCH expression (OR of quoted keywords), or null if the query
 * has no usable terms.
 * @param {string} query
 * @returns {string | null}
 */
export function ftsMatch(query: string): string | null;