/**
 * Text normalization utilities for language detection
 */
/**
 * Normalize text for language detection
 * @param text - Raw input text
 * @returns Normalized text
 */
export declare function normalizeText(text: string | null | undefined): string;
/**
 * Augment text with common variations for training
 * @param text - Original text
 * @param lang - Language code
 * @returns Array of text variations
 */
export declare function augmentText(text: string, lang: string): string[];
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