import type { Weekday } from "../calendar/types";
import type { GanttBar, GanttRow, GanttScale, GanttTask, GanttTick } from "./types";
/** Pixels per day at each zoom. Day = roomy single days; month = dense quarters. */
export declare function pxPerDay(scale: GanttScale): number;
/** The axis window: from the earliest task start to the latest end, padded so
 *  bars never hug the edges. Falls back to a month around `today` when empty. */
export declare function axisRange(tasks: GanttTask[], today?: Date, padDays?: number): {
    start: Date;
    end: Date;
};
/** Bar geometry: left = days from axis start; width spans the inclusive end.
 *  A milestone has no span — it is a marker centred on its day. */
export declare function barGeometry<T>(task: GanttTask<T>, axisStart: Date, scale: GanttScale): GanttBar<T>;
/**
 * The chart's lines, in render order: each lane's heading followed by its tasks.
 * Ungrouped tasks lead, so a chart that uses no groups is unchanged; lanes appear
 * in the order they are first seen, which keeps the caller's own array order
 * rather than sorting alphabetically behind their back.
 */
export declare function buildRows<T>(tasks: GanttTask<T>[]): GanttRow<T>[];
/**
 * Header ticks across [start, end]. Granularity follows the zoom: a tick per day
 * (day), per week (week), or per month (month). Each tick flags a month start so
 * the view can draw a heavier divider / month band — the monday.com two-level feel.
 */
export declare function buildTicks(axisStart: Date, axisEnd: Date, scale: GanttScale, locale?: string, weekStartsOn?: Weekday): GanttTick[];