utils isValidCustomProperty.js

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  const metadata = require('../metadata/metadata.js');
 
/**
 * Check if the CSS custom property should be recognized by Stylelint
 *
 * @param {String} value - value to be evaluated
 * @param {String} privateSyntax - syntax that declares a custom property as private
 *
 * @returns {Boolean} - true if a valid CSS custom property and not a private variable
 */
const isValidCustomProperty = ({ value, privateSyntax }) => {
  const REQUIRED_PREFIX = '--';
 
  return typeof value === 'string' && value.startsWith(REQUIRED_PREFIX) && !value.includes(privateSyntax);
};
 
module.exports = isValidCustomProperty;