import { either as E, readonlyNonEmptyArray as RNEA } from 'fp-ts/lib';
import { HighLowClose, ReadonlyRecordNonEmptyArray } from '../types.js';
type ADXReturn = ReadonlyRecordNonEmptyArray<number | null> & {
    readonly adx: RNEA.ReadonlyNonEmptyArray<number | null>;
    readonly mdi: RNEA.ReadonlyNonEmptyArray<number>;
    readonly pdi: RNEA.ReadonlyNonEmptyArray<number>;
};
/**
 * The Average Directional Index (ADX) determines trend strength.
 * It also delivers Plus Directional Movement Indicator (PDI)
 * and Minus Directional Movement Indicator (MDI).
 * Crossings of these three values can be used to determine trend changes.
 *
 * @public
 */
export declare const adx: (values: HighLowClose<number>, period?: number) => E.Either<Error, ADXReturn>;
export {};