/**
 * Canonicalise text before synthesis.
 *
 * - Applies Unicode NFKC, so full width latin becomes half width and half
 *   width katakana becomes full width.
 * - Strips control characters.
 * - Collapses every whitespace run into a single space and trims the result.
 */
export declare function normalizeText(text: string): string;
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