@kcuf/mere-color/dist/esm/a11y/a11y-contrast.js

Mere color utils for generating, manipulation, a11y purposes.

import { computeContrast } from '../util';
import a11yLuminance from './a11y-luminance';

/**
 * Returns a contrast ratio for a color pair [1-21].
 *
 * http://www.w3.org/TR/WCAG20/#contrast-ratiodef
 */
export default function a11yContrast(fgc) {
  var bgc = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : '#fff';
  return computeContrast(a11yLuminance(fgc), a11yLuminance(bgc));
}
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