/**
 * Japanese text normalization for preProcess: converts Arabic digits to
 * hiragana so the downstream ja-g2p (romaji-based after anyAscii) can read
 * them.
 *
 * Outputs hiragana in base form without rendaku — ja-g2p's syllable map
 * lacks the palatal voiced rows (bya/pya/…), so emitting さんびゃく would
 * produce broken phonemes for the びゃ slot. We accept さんひゃく etc. as
 * the imperfect-but-tokenizable compromise.
 */
export declare function expandJapaneseText(text: string): string;