import type { ColorScale } from "../types";
/** WCAG AA for normal-size text. Accent-as-text must clear this against the canvas. */
declare const AA_NORMAL_TEXT = 4.5;
export declare const pickAccentText: (primary: ColorScale, canvas: string) => string;
/** Canvas assumed when no Pixelize theme is mounted. Never painted; only fed to contrast math. */
export declare const DEFAULT_CANVAS = "#ffffff";
/** Mode-stable ink absolutes, used when no theme supplies `colors.white` / `colors.black`. */
export declare const DEFAULT_WHITE = "#ffffff";
export declare const DEFAULT_BLACK = "#000000";
/** Below this relative luminance a canvas is treated as dark. Well clear of both real canvases. */
declare const DARK_CANVAS_LUMINANCE = 0.2;
/** True when `canvas` is a dark surface. Lets style configs branch without threading color mode. */
export declare const isDarkCanvas: (canvas: string) => boolean;
export declare const accentTextOnCanvas: (scale: ColorScale, canvas: string) => string;
/** Accent ink for chrome that can land on any plane (canvas, card, overlay): the first rung clearing AA on all. */
export declare const accentTextOnPlanes: (scale: ColorScale, planes: readonly string[]) => string;
export declare const onFilled: (fill: string, white: string, black: string) => string;
export declare const onGradient: (from: string, to: string, white: string, black: string) => string;
export { AA_NORMAL_TEXT, DARK_CANVAS_LUMINANCE };