/**
 * USPS street-suffix variant expansion + compound split/join.
 *
 * Canonical implementation hoisted from zillow-mcp's `resolver.ts`
 * (which already lived through suffix_expansion → search_fallback
 * laddering) and redfin-mcp's `suffix.ts` (which has the cleanest
 * dedupe + remainder-preservation handling). Compass / homes / onehome
 * do not currently expand suffixes at the resolver layer — they will
 * once they migrate to this module.
 *
 * Drift this resolves:
 *
 *  - zillow had `Rd ↔ Road, Ln ↔ Lane, Dr ↔ Drive` only.
 *  - redfin added `Pkwy, Pl, Trl, Ter, Xing, Aly, Pt, Mtn, Vw, Vly`.
 *  - Round-3 #75 needs `Hts ↔ Heights` and `Mtn ↔ Mountain` for the
 *    Lake Lure / Banner Elk cohort, plus compound split (`Bluebird` ↔
 *    `Blue Bird`) for the Sleeping-Bear-ish mountain names.
 */
export declare const SUFFIX_PAIRS: ReadonlyArray<readonly [string, string]>;
/**
 * Generate suffix variants of the input. Each variant swaps the
 * trailing street-suffix between its abbreviated and full form.
 * Returns ONLY the alternates — the caller is expected to also try
 * the original. Empty when no recognised suffix.
 */
export declare function expandSuffix(address: string): string[];
/**
 * Generate "Bluebird" ↔ "Blue Bird"-style variants. For each token in
 * the street portion of length >= 6, emit splits at every position
 * that yields two >=3-char alphabetic halves. The right half is
 * title-cased so casing stays plausible across both branches. For
 * multi-token streets, also emit a join variant for each adjacent
 * alphabetic pair, preserving the left token's casing on the join.
 *
 * Deliberately greedy (returns every viable split) — the address-match
 * scorer at the consumer end is cheap and the resolver tries variants
 * in order. False positives cost one extra resolver call; missing a
 * variant costs a wrong/missed result.
 */
export declare function compoundSplits(address: string): string[];
/**
 * Combined dedupe of original + suffix variants + compound variants.
 * The original is always first. The caller iterates in order, stopping
 * on the first that resolves.
 */
export declare function buildVariants(address: string): string[];