import { BandScale } from './band-scale';
import { LinearScale } from './linear-scale';
export interface Band {
    /** Left (top on a vertical axis) edge of the band, in pixels. */
    start: number;
    /** Width of the band itself — what a bar fills. */
    size: number;
    /** Step to the next band, gap included — what a heatmap cell fills. */
    step: number;
}
export interface BandLayout {
    /** The band of a value, or undefined when the value is not on the scale. */
    bandOf(value: unknown): Band | undefined;
}
/**
 * Smallest distance between neighbouring values — the widest band that never
 * runs into the next one. The minimum rather than the average: with months of
 * unequal length, or a day of data missing, an average step overlaps.
 */
export declare function closestSpan(values: readonly unknown[], parse?: (value: unknown) => number): number | undefined;
/**
 * Band layout over any scale. `span` is the step of the data in axis units
 * (milliseconds on a time axis) and is only consulted on a continuous scale;
 * without it — and there is nothing to derive it from on a single point — the
 * band falls back to a share of `extent`, the plot's length along the axis.
 */
export declare function bandLayout(scale: BandScale<unknown> | LinearScale, span: number | undefined, extent: number): BandLayout;