import * as d3_sc from 'd3-scale-chromatic';
import type { Vec3 } from '../math';
import type { ELEM_SYMBOLS } from '../labels';
export type D3InterpolateName = keyof typeof d3_sc & `interpolate${string}`;
export type D3ColorSchemeName = D3InterpolateName extends `interpolate${infer Name}` ? Name : never;
export declare const get_d3_interpolator: (name: D3InterpolateName) => ((t: number) => string);
export declare const COLOR_SCALE_TYPES: readonly ["continuous", "categorical"];
export type ColorScaleType = (typeof COLOR_SCALE_TYPES)[number];
export declare const DEFAULT_CATEGORY_COLORS: Record<string, string>;
export declare const AXIS_COLORS: readonly [readonly ["x", "#d75555", "#e66666"], readonly ["y", "#55b855", "#66c966"], readonly ["z", "#5555d7", "#6666e6"]];
export declare const NEG_AXIS_COLORS: readonly [readonly ["nx", "#b84444", "#cc5555"], readonly ["ny", "#44a044", "#55b155"], readonly ["nz", "#4444b8", "#5555c9"]];
export type RGBColor = Vec3;
export type ElementColorScheme = Record<(typeof ELEM_SYMBOLS)[number], RGBColor>;
export declare const vesta_hex: Record<string, string>;
export declare const jmol_hex: Record<string, string>;
export declare const alloy_hex: Record<string, string>;
export declare const pastel_hex: Record<string, string>;
export declare const muted_hex: Record<string, string>;
export declare const dark_mode_hex: Record<string, string>;
export declare const ELEMENT_COLOR_SCHEMES: {
    readonly Vesta: Record<string, string>;
    readonly Jmol: Record<string, string>;
    readonly Alloy: Record<string, string>;
    readonly Pastel: Record<string, string>;
    readonly Muted: Record<string, string>;
    readonly 'Dark Mode': Record<string, string>;
};
export type ColorSchemeName = keyof typeof ELEMENT_COLOR_SCHEMES;
export declare const default_element_colors: {
    [x: string]: string;
};
export declare const is_color: (val: unknown) => val is string;
export declare const PLOT_COLORS: readonly ["#63b3ed", "#68d391", "#fbd38d", "#fc8181", "#d6bcfa", "#4fd1c7", "#f687b3", "#fed7d7", "#bee3f8", "#c6f6d5"];
export declare function luminance(clr: string): number;
export declare function get_bg_color(elem: HTMLElement | null, bg_color?: string | null): string;
export interface ContrastOptions {
    bg_color?: string;
    luminance_threshold?: number;
    choices?: [string, string];
}
export declare function pick_contrast_color(options?: ContrastOptions): string;
export declare const contrast_color: (options?: ContrastOptions) => (node: HTMLElement) => void;
export declare function get_page_background(fallback_dark?: string, fallback_light?: string): string;
export declare function is_dark_mode(): boolean;
export declare function watch_dark_mode(on_change: (dark: boolean) => void): () => void;
export declare function css_color_to_hex(color: string | undefined, fallback: string): string;
export declare function add_alpha(color: string, alpha: number): string;