import type { ReadOnlyIterable, Unary } from "@lou.codes/types";
/**
 * Map for iterables.
 *
 * @category Generators
 * @example
 * ```typescript
 * const double = value => value * 2;
 * const mapDouble = map(double);
 *
 * mapDouble([1, 2, 3]); // [2, 4, 6]
 * ```
 * @param mapper Mapper function.
 * @returns Generator function with `mapper` function set in context.
 */
export declare const map: <Item, MappedItem>(
	mapper: Unary<Item, MappedItem>,
) => (
	iterable: ReadOnlyIterable<Item>,
) => Readonly<IterableIterator<MappedItem>>;