import type { CSS4Color } from "@siteimprove/alfa-css";
import type { Device } from "@siteimprove/alfa-device";
import type { Text } from "@siteimprove/alfa-dom";
import { Element, Node } from "@siteimprove/alfa-dom";
import { Group } from "../act/group.ts";
/**
 * @internal
 */
export declare function hasSufficientContrast(target: Text, device: Device, largeTextThreshold: number, normalTextThreshold: number): {
    1: import("@siteimprove/alfa-act").Question<"node[]", Group<Element<string>>, Text, globalThis.Iterable<Node>, import("@siteimprove/alfa-act").Question<"color[]", Text, Text, globalThis.Iterable<CSS4Color>, import("@siteimprove/alfa-act").Question<"color[]", Text, Text, globalThis.Iterable<CSS4Color>, import("@siteimprove/alfa-option").Maybe<import("@siteimprove/alfa-result").Result<import("@siteimprove/alfa-act").Diagnostic, import("@siteimprove/alfa-act").Diagnostic>>, "background-colors">, "foreground-colors">, "ignored-interposed-elements">;
};
/**
 * {@link https://w3c.github.io/wcag/guidelines/#dfn-contrast-ratio}
 *
 * @internal
 */
export declare function contrast(foreground: CSS4Color, background: CSS4Color): number;
//# sourceMappingURL=contrast.d.ts.map