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import type { ChartArea } from '../types/index.js';
import type { SplinePoint } from '../types/geometric.js';
export declare function splineCurve(firstPoint: SplinePoint, middlePoint: SplinePoint, afterPoint: SplinePoint, t: number): {
previous: SplinePoint;
next: SplinePoint;
};
/**
* This function calculates Bézier control points in a similar way than |splineCurve|,
* but preserves monotonicity of the provided data and ensures no local extremums are added
* between the dataset discrete points due to the interpolation.
* See : https://en.wikipedia.org/wiki/Monotone_cubic_interpolation
*/
export declare function splineCurveMonotone(points: SplinePoint[], indexAxis?: 'x' | 'y'): void;
/**
* @private
*/
export declare function _updateBezierControlPoints(points: SplinePoint[], options: any, area: ChartArea, loop: boolean, indexAxis: 'x' | 'y'): void;