/** Folds case and diacritics (`dieu` matches `Điều`), substring only. One definition, since a list
 *  matching differently reads as missing data. `Đ` needs an explicit fold: NFD leaves it one codepoint
 *  with no mark to strip. */
export declare function normalizeForSearch(s: string): string;
/** A code as typed: both sides keep only letters and digits, so `14b031` and `031.02` find `14B-031.02`.
 *  Substring, never subsequence, or `1402` would match half the register. */
export declare function codeKey(s: string): string;
/** An empty query matches everything. */
export declare function codeMatches(query: string, ...fields: string[]): boolean;