@atlaskit/adf-schema/dist/esm/utils/expand-shorthand-hex.js

Shared package that contains the ADF-schema (json) and ProseMirror node/mark specs

var SHORTHAND_HEX_REGEX = /^#?([0-9a-f])([0-9a-f])([0-9a-f])$/i;
export var expandShorthandHex = function expandShorthandHex(input) {
  return input.replace(SHORTHAND_HEX_REGEX, function (_m, r, g, b) {
    return r + r + g + g + b + b;
  });
};