import { Operator } from '../Seq';
/**
 * Returns the sequence in which each element has been transformed by the specified transformation function.
 *
 * ```typescript
 * const result = from([1, 2, 3, 4, 5]).pipe(map(i => i * i)).toArray();
 * //result: [1,4,9,16,25]
 * ```
 *
 * @param func Transform function.
 * @returns Operator function.
 * @typeParam T Source element type.
 * @typeParam TResult Transformed element type.
 * @category Operators
 */
export declare const map: <T, TResult>(func: (arg: T, index: number) => TResult) => Operator<T, TResult>;