@kcuf/mere-color/dist/esm/generate/shade.js

Mere color utils for generating, manipulation, a11y purposes.

import { manipulateRgb, rgbMix } from '../util';

/**
 * Shades a color by mixing it with black.
 *
 * `shade` can produce hue shifts, whereas `darken` manipulates the luminance channel and therefore
 * doesn't produce hue shifts.
 */
export default function shade(color) {
  var percentage = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 10;
  return manipulateRgb(color, function (rgb) {
    return rgbMix(rgb, {
      r: 0,
      g: 0,
      b: 0
    }, [100 - percentage, percentage]);
  });
}
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