import { either as E, readonlyNonEmptyArray as RNEA } from 'fp-ts/lib';
/**
 * The Simple Moving Average (SMA) calculates the arithmetic mean of prices over an period.
 * It can be used to identify support and resistance levels.
 * Also prices above the SMA can indicate uptrends, prices below can indicate downtrends.
 *
 * @public
 */
export declare const sma: (values: ReadonlyArray<number>, period?: number) => E.Either<Error, RNEA.ReadonlyNonEmptyArray<number>>;