/**
 * Removes duplicate values from an array, preserving the order of the first occurrence
 * of each unique value.
 *
 * @param values - An array or readonly array of values to deduplicate.
 * @returns A new array containing only unique values.
 *
 * @example
 * ```typescript
 * unique([1, 2, 2, 3, 4, 4, 5]); // [1, 2, 3, 4, 5]
 * ```
 */
export declare const unique: <V>(values: V[] | readonly V[]) => V[];
/**
 * Removes duplicate values from an array based on a key function, preserving either
 * the first or last occurrence of each unique key. If
 *
 * @param values - An array or readonly array of values to deduplicate.
 * @param key - A function that creates a unique key for each value.
 * @param keepFirst - An optional boolean indicating whether to keep the first instance
 *                    (`true`, default) or the last instance (`false`) of each unique key.
 * @returns A new array containing only unique values based on the created keys.
 *
 * @example
 * // Default behavior (keep first instance):
 * by(
 *   [{ id: 1, name: "A" }, { id: 2, name: "B" }, { id: 1, name: "C" }],
 *   (value) => value.id
 * );
 * // Result: [{ id: 1, name: "A" }, { id: 2, name: "B" }]
 *
 * @example
 * // Keep last instance:
 * by(
 *   [{ id: 1, name: "A" }, { id: 2, name: "B" }, { id: 1, name: "C" }],
 *   (value) => value.id,
 *   false
 * );
 * // Result: [{ id: 2, name: "B" }, { id: 1, name: "C" }]
 */
export declare const by: <V>(values: V[] | readonly V[], key: (value: V) => unknown, keepFirst?: boolean) => V[];
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