stylelint/dist/utils/isStandardSyntaxUrl.js

Modern CSS linter

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});

exports.default = function (url) {

  // SCSS or Less interpolation
  if (/#{.+?}|@{.+?}|\$\(.+?\)/.test(url)) {
    return false;
  }

  // Inside `'` and `"` work only interpolation
  if (url[0] === "'" && url[url.length - 1] === "'" || url[0] === "\"" && url[url.length - 1] === "\"") {
    return true;
  }

  // Sass and Less variables at the beginning or after a + sign within
  if (url[0] === "$" || url[0] === "@" || /['"]\s*\+\s*[\$@]/.test(url)) {
    return false;
  }

  return true;
};