import { ThemeType } from '../../../types';
/** A pleasant default multi-series sequence (theme tokens). */
export declare const SERIES_TONES: ThemeType[];
/**
 * Resolve a caller color into a paintable CSS value.
 * - tone name → `var(--bgl-<tone>)`
 * - anything else (hex/rgb/var(...)) → returned as-is
 * - undefined → falls back to the series-index tone
 */
export declare function resolveColor(color: ThemeType | string | undefined, index?: number): string;
/** A translucent version of a resolved color (for area fills / hovers). */
export declare function alpha(cssColor: string, pct: number): string;
/**
 * A monochrome ramp: `count` shades of one base color, from full strength to a
 * lighter tint. Reads premium for donut/pie slices and stacked categories.
 * `index 0` is the strongest; later slices fade toward white.
 */
export declare function ramp(base: ThemeType | string | undefined, count: number, index?: number): string;
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