import type { ColorScale, PaletteProps } from "../types";
/** Resolved fill + ink for a solid surface, including hover/active steps. */
export type FilledSurface = {
    rung: keyof ColorScale;
    fill: string;
    color: string;
    hoverRung: keyof ColorScale;
    hoverFill: string;
    hoverColor: string;
    activeRung: keyof ColorScale;
    activeFill: string;
    activeColor: string;
};
export declare const solidFillRung: (scale: ColorScale, white: string, canvas?: string) => keyof ColorScale;
/**
 * Hover (step 0) or active (step 1) fill rung, one step darker than `solidFillRung`. A step may not
 * flip the label's side of AA (zinc dark: near-white fill, black ink) or fall below `CHROME_BORDER`
 * against the canvas (a pressed warning solid used to reach 1.00:1 on the card).
 */
export declare const darkerFillRung: (scale: ColorScale, canvas: string, white: string, step: 0 | 1) => keyof ColorScale;
/** Label ink for a specific fill swatch — always `onFilled`, exported for style configs. */
export declare const labelOnFill: (fill: string, white: string, black: string) => string;
type SurfaceColors = Pick<PaletteProps, "white" | "black" | "backgroundColor" | "background">;
export declare const resolveFilledSurface: (scale: ColorScale, colors: SurfaceColors) => FilledSurface;
export {};