/**
 * Palette registry.
 *
 * Anchor stops only: the actual class colours are sampled in OkLab at render
 * time so a 4-class and a 9-class map of the same data stay perceptually
 * consistent.
 *
 * Sequential and diverging ramps follow the ColorBrewer families (Brewer and
 * Harrower), which are the de-facto standard for thematic cartography and are
 * colourblind-checked. `viridis` and `magma` come from the matplotlib
 * colormaps, which are perceptually uniform and CC0.
 *
 * @module scales/Palettes
 */
export type PaletteKind = 'sequential' | 'diverging' | 'categorical';
export interface Palette {
    kind: PaletteKind;
    stops: string[];
    colorblindSafe?: boolean;
}
export declare function registerPalette(name: string, palette: Palette): void;
export declare function getPalette(name: string): Palette | undefined;
export declare function listPalettes(): string[];
export declare function hasPalette(name: string): boolean;
/**
 * Pick a sensible default palette for a domain.
 *
 * A domain that straddles zero is almost always an anomaly, change, margin or
 * difference, so it gets a diverging ramp anchored at zero. Everything else gets
 * a sequential ramp. Choosing this automatically prevents the single most common
 * palette error: a sequential ramp on signed data, which hides the sign.
 *
 */
export declare function defaultPaletteFor(domain: [number, number]): string;
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