import type { ReadOnlyIterable } from "@lou.codes/types";
/**
 * Returns a single instance of each item in the iterable.
 *
 * @category Generators
 * @example
 * ```typescript
 * unique([1, 2, 3, 4, 1, 2, 3, 4]); // [1, 2, 3, 4]
 * ```
 * @param iterable Iterable to be filtered.
 * @returns Generators with a single instance of each item of the iterable.
 */
export declare const unique: <Item>(
	iterable: ReadOnlyIterable<Item>,
) => Readonly<IterableIterator<Item>>;