export declare const lag: (history: readonly number[], bars: number) => number;
export declare const pushCapped: (history: number[], value: number, maxLength: number) => void;
export type HilbertCycleState = {
    detrenders: number[];
    i2: number;
    im: number;
    period: number;
    q2: number;
    quadratures: number[];
    re: number;
    smoothed: number[];
};
export declare const createHilbertCycleState: () => HilbertCycleState;
export declare const measureDominantCycle: (state: HilbertCycleState, prices: readonly number[]) => {
    i1: number;
    q1: number;
};