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import { AnyColor } from "../types";
import { Plugin } from "../extend";
interface ReadabilityOptions {
level?: "AA" | "AAA";
size?: "normal" | "large";
}
declare module "../colord" {
interface Colord {
/**
* Returns the relative luminance of a color,
* normalized to 0 for darkest black and 1 for lightest white.
* https://www.w3.org/TR/WCAG20/#relativeluminancedef
* https://developer.mozilla.org/en-US/docs/Web/Accessibility/Understanding_Colors_and_Luminance
*/
luminance(): number;
/**
* Calculates a contrast ratio for a color pair.
* This luminance difference is expressed as a ratio ranging
* from 1 (e.g. white on white) to 21 (e.g., black on a white).
* WCAG requires a ratio of at least 4.5 for normal text and 3 for large text.
* https://www.w3.org/TR/UNDERSTANDING-WCAG20/visual-audio-contrast-contrast.html
* https://webaim.org/articles/contrast/
*/
contrast(color2?: AnyColor | Colord): number;
/**
* Checks that a background and text color pair conforms to WCAG 2.0 requirements.
* https://www.w3.org/TR/UNDERSTANDING-WCAG20/visual-audio-contrast-contrast.html
*/
isReadable(color2?: AnyColor | Colord, options?: ReadabilityOptions): boolean;
}
}
/**
* A plugin adding accessibility and color contrast utilities.
* Follows Web Content Accessibility Guidelines 2.0.
* https://www.w3.org/TR/WCAG20/
*/
declare const a11yPlugin: Plugin;
export default a11yPlugin;