update

node_modules/postcss-selector-parser/dist/util/ensureObject.js

@@ -1,7 +1,7 @@
 "use strict";
 
 exports.__esModule = true;
-exports.default = ensureObject;
+exports["default"] = ensureObject;
 
 function ensureObject(obj) {
   for (var _len = arguments.length, props = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {

node_modules/postcss-selector-parser/dist/util/getProp.js

@@ -1,7 +1,7 @@
 "use strict";
 
 exports.__esModule = true;
-exports.default = getProp;
+exports["default"] = getProp;
 
 function getProp(obj) {
   for (var _len = arguments.length, props = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {

node_modules/postcss-selector-parser/dist/util/index.js

@@ -5,18 +5,18 @@ exports.stripComments = exports.ensureObject = exports.getProp = exports.unesc =
 
 var _unesc = _interopRequireDefault(require("./unesc"));
 
-exports.unesc = _unesc.default;
+exports.unesc = _unesc["default"];
 
 var _getProp = _interopRequireDefault(require("./getProp"));
 
-exports.getProp = _getProp.default;
+exports.getProp = _getProp["default"];
 
 var _ensureObject = _interopRequireDefault(require("./ensureObject"));
 
-exports.ensureObject = _ensureObject.default;
+exports.ensureObject = _ensureObject["default"];
 
 var _stripComments = _interopRequireDefault(require("./stripComments"));
 
-exports.stripComments = _stripComments.default;
+exports.stripComments = _stripComments["default"];
 
-function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }

node_modules/postcss-selector-parser/dist/util/stripComments.js

@@ -1,7 +1,7 @@
 "use strict";
 
 exports.__esModule = true;
-exports.default = stripComments;
+exports["default"] = stripComments;
 
 function stripComments(str) {
   var s = "";

node_modules/postcss-selector-parser/dist/util/unesc.js

@@ -1,20 +1,93 @@
 "use strict";
 
 exports.__esModule = true;
-exports.default = unesc;
-var whitespace = '[\\x20\\t\\r\\n\\f]';
-var unescapeRegExp = new RegExp('\\\\([\\da-f]{1,6}' + whitespace + '?|(' + whitespace + ')|.)', 'ig');
+exports["default"] = unesc;
+
+// Many thanks for this post which made this migration much easier.
+// https://mathiasbynens.be/notes/css-escapes
+
+/**
+ * 
+ * @param {string} str 
+ * @returns {[string, number]|undefined}
+ */
+function gobbleHex(str) {
+  var lower = str.toLowerCase();
+  var hex = '';
+  var spaceTerminated = false;
+
+  for (var i = 0; i < 6 && lower[i] !== undefined; i++) {
+    var code = lower.charCodeAt(i); // check to see if we are dealing with a valid hex char [a-f|0-9]
+
+    var valid = code >= 97 && code <= 102 || code >= 48 && code <= 57; // https://drafts.csswg.org/css-syntax/#consume-escaped-code-point
+
+    spaceTerminated = code === 32;
+
+    if (!valid) {
+      break;
+    }
+
+    hex += lower[i];
+  }
+
+  if (hex.length === 0) {
+    return undefined;
+  }
+
+  var codePoint = parseInt(hex, 16);
+  var isSurrogate = codePoint >= 0xD800 && codePoint <= 0xDFFF; // Add special case for
+  // "If this number is zero, or is for a surrogate, or is greater than the maximum allowed code point"
+  // https://drafts.csswg.org/css-syntax/#maximum-allowed-code-point
+
+  if (isSurrogate || codePoint === 0x0000 || codePoint > 0x10FFFF) {
+    return ["\uFFFD", hex.length + (spaceTerminated ? 1 : 0)];
+  }
+
+  return [String.fromCodePoint(codePoint), hex.length + (spaceTerminated ? 1 : 0)];
+}
+
+var CONTAINS_ESCAPE = /\\/;
 
 function unesc(str) {
-  return str.replace(unescapeRegExp, function (_, escaped, escapedWhitespace) {
-    var high = '0x' + escaped - 0x10000; // NaN means non-codepoint
-    // Workaround erroneous numeric interpretation of +"0x"
-    // eslint-disable-next-line no-self-compare
+  var needToProcess = CONTAINS_ESCAPE.test(str);
 
-    return high !== high || escapedWhitespace ? escaped : high < 0 ? // BMP codepoint
-    String.fromCharCode(high + 0x10000) : // Supplemental Plane codepoint (surrogate pair)
-    String.fromCharCode(high >> 10 | 0xd800, high & 0x3ff | 0xdc00);
-  });
+  if (!needToProcess) {
+    return str;
+  }
+
+  var ret = "";
+
+  for (var i = 0; i < str.length; i++) {
+    if (str[i] === "\\") {
+      var gobbled = gobbleHex(str.slice(i + 1, i + 7));
+
+      if (gobbled !== undefined) {
+        ret += gobbled[0];
+        i += gobbled[1];
+        continue;
+      } // Retain a pair of \\ if double escaped `\\\\`
+      // https://github.com/postcss/postcss-selector-parser/commit/268c9a7656fb53f543dc620aa5b73a30ec3ff20e
+
+
+      if (str[i + 1] === "\\") {
+        ret += "\\";
+        i++;
+        continue;
+      } // if \\ is at the end of the string retain it
+      // https://github.com/postcss/postcss-selector-parser/commit/01a6b346e3612ce1ab20219acc26abdc259ccefb
+
+
+      if (str.length === i + 1) {
+        ret += str[i];
+      }
+
+      continue;
+    }
+
+    ret += str[i];
+  }
+
+  return ret;
 }
 
 module.exports = exports.default;