/**
 * Returns the plural form of the given word.
 */
export declare function pluralize(word: string): string;
/**
 * Returns the singular form of the given word.
 */
export declare function singularize(word: string): string;
/**
 * Returns true if the (last) word is plural.
 */
export declare function isPlural(word: string): boolean;
/**
 * Returns true if the (last) word is singular.
 */
export declare function isSingular(word: string): boolean;
/**
 * Adds a new mapping from singular to plural.
 *
 * This function also maintains reverse mappings and ensures any previous
 * conflicting mapping is removed (tests rely on this behavior).
 */
export declare function addSingularPlural(singular: string, plural: string): void;
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