export type ChartStyle = {
    lineWidth: number;
    strokeStyle: string;
    fillStyle?: string | CanvasGradient | CanvasPattern | undefined;
    clip?: boolean;
};
export declare const drawChart: (ctx: CanvasRenderingContext2D, area: [number, number, number, number], values: number[], style?: ChartStyle) => void;
export type ColorTransferFunction = {
    getUint8Table: (start: number, end: number, width: number, withAlpha: boolean) => Uint8Array;
    getMappingRange: () => [number, number];
    getSize: () => number;
    getColor: (x: number, rgba: Array<number>) => void;
};
export declare const updateColorCanvas: (colorTransferFunction: ColorTransferFunction, width: number, renderedDataRange: [number, number], canvas: HTMLCanvasElement) => HTMLCanvasElement;
export declare const windowPointsForSort: (points: [number, number][]) => number[][];
export declare const logTransform: (histogram?: number[]) => number[];
export declare function arrayEquals<T>(a: Array<T>, b: Array<T>): boolean;
export declare function rgbaToHexa(rgba: Array<number>): string;
export declare const getNodes: (range: number[], points: Array<[number, number]>) => {
    x: number;
    y: number;
    midpoint: number;
    sharpness: number;
}[];