/**
 * Generate a new array which has no duplicate values.
 * Preserves the order of the first occurrence of each value.
 * Returns the original array if no duplicates were found.
 */
export declare const arrayUnique: <T>(array: T[]) => T[];
/**
 * Generate a function for use in an array reducer which will track
 * and only keep the first occurrence of each value.
 */
export declare const uniqueReducer: () => <T>(prev: T[], cur: T) => T[];
/**
 * Generate the args for an array reducer which keeps only distinct
 * values.
 * @example
 * const unique = items.reduce(...reduceToUnique());
 */
export declare const reduceToUnique: <T>() => [(prev: T[], cur: T) => T[], T[]];
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