import { ISODateString, TaskEntity, TimelineZoomPreset } from './types';
export interface TimelineHeaderCell {
    readonly key: string;
    readonly label: string;
    readonly x: number;
    readonly width: number;
}
export interface TimelineHeaderRow {
    readonly key: string;
    readonly cells: readonly TimelineHeaderCell[];
}
export interface TimelineScale {
    readonly startDate: ISODateString;
    readonly endDate: ISODateString;
    readonly tickWidth: number;
    readonly tickCountDays: number;
    readonly totalWidth: number;
    dateToX(date: ISODateString): number;
    xToDate(x: number): ISODateString;
    getHeaderRows(): readonly TimelineHeaderRow[];
}
/** Resolve a named zoom preset to its tick width and calendar-day span. */
export declare function getTimelinePreset(preset?: TimelineZoomPreset): {
    tickWidth: number;
    tickCountDays: number;
};
/**
 * Compute the timeline date range for a task set.
 *
 * The returned range includes light padding around the task dates and always
 * spans at least two years so the timeline has enough future scheduling space.
 */
export declare function getTaskTimelineRange(tasks: readonly TaskEntity[]): {
    startDate: ISODateString;
    endDate: ISODateString;
};
/**
 * Create a deterministic timeline scale for date/pixel conversion and headers.
 *
 * The scale is pure: callers can use it in tests, renderers, or future
 * scheduling code without depending on DOM or RevoGrid state.
 */
export declare function createTimelineScale(options: {
    readonly startDate: ISODateString;
    readonly endDate: ISODateString;
    readonly zoomPreset?: TimelineZoomPreset;
    readonly locale?: string;
}): TimelineScale;
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