/** Shared SVG chart geometry helpers (ported from Atom progreso / check-in). */
export interface ChartXY {
    x: number;
    y: number;
    value: number;
    index: number;
}
export interface ChartPad {
    t: number;
    r: number;
    b: number;
    l: number;
}
export declare const DEFAULT_PAD: ChartPad;
export declare function scaleDomain(values: number[], padRatio?: number): {
    min: number;
    max: number;
};
export declare function mapPoints(values: number[], width: number, height: number, pad?: ChartPad, domain?: {
    min: number;
    max: number;
}): ChartXY[];
/** Smooth cubic path (Atom progreso style). */
export declare function smoothLinePath(points: ChartXY[]): string;
export declare function linearLinePath(points: ChartXY[]): string;
export declare function areaPath(linePath: string, points: ChartXY[], height: number, pad: ChartPad): string;
export declare function tipAlign(leftPct: number): 'start' | 'center' | 'end';
export declare function formatTick(n: number, digits?: number): string;