/**
 * Frequency Extension Types
 *
 * @packageDocumentation
 */
/**
 * Frequency category
 */
export type FrequencyCategory = "very-common" | "common" | "uncommon" | "rare";
/**
 * Frequency level (same as FrequencyCategory)
 */
export type FrequencyLevel = FrequencyCategory;
/**
 * Frequency data structure
 */
export interface FrequencyData {
    /** Frequency rank (1 = most common) */
    rank: number;
    /** Frequency category */
    category: FrequencyCategory;
    /** Percentile (0-1, where 1 = most common) */
    percentile?: number;
    /** Frequency per million words */
    perMillion?: number;
}
/**
 * Frequency metadata with display properties
 */
export interface FrequencyMetadata {
    /** Frequency level */
    level: FrequencyLevel;
    /** Human-readable display label */
    display?: string;
    /** Color code for UI display */
    color?: string;
    /** Priority for sorting (higher = more common) */
    priority?: number;
}
/**
 * Provider interface for frequency data
 */
export interface FrequencyProvider {
    /**
     * Get frequency data for a word
     *
     * @param word - The word to look up
     * @param language - Language code
     * @returns Frequency level or undefined if not available
     */
    getFrequency(word: string, language: string): Promise<FrequencyLevel | undefined>;
}
/**
 * Augment GLOSTExtras with frequency field
 */
declare module "glost" {
    interface GLOSTExtras {
        frequency?: FrequencyMetadata;
    }
}
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