@macrostrat/column-components/dist/chroma-js/src/ops/alpha.js

React rendering primitives for stratigraphic columns

import Color from "../Color.js";
import type from "../utils/type.js";
Color.prototype.alpha = function(a, mutate = false) {
  if (a !== void 0 && type(a) === "number") {
    if (mutate) {
      this._rgb[3] = a;
      return this;
    }
    return new Color([this._rgb[0], this._rgb[1], this._rgb[2], a], "rgb");
  }
  return this._rgb[3];
};
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