csslint: only suppress validation errors caused by USO-vars

vendor-overwrites/csslint/WARNING.txt

@@ -1,18 +0,0 @@
-1. Until https://github.com/CSSLint/parser-lib/issues/229 is fixed, manually replace:
-
-  while (lt !== Tokens.COMMA && lt !== Tokens.S && lt !== Tokens.RPAREN) {
-
-  in "_function: function()" with
-
-  while (lt !== Tokens.COMMA && lt !== Tokens.S && lt !== Tokens.RPAREN && lt !== Tokens.EOF) {
-
-2. Apply our hacks unless supported natively
-  (use git history for the file as this warning may be obsolete):
-
-  * 449a27cc Add CSSLint position sticky rule
-  * d49e44dd CSS variables
-  * 2e86c958 fire startdocument on {
-  * bc63ecca support "i" in attribute selector
-  * 2468784e fix crashing on unclosed calc() at eof
-  * 3287b79f Support :any(), :-webkit-any(), :-moz-any()
-  * 4684016a Support @supports inside @-moz-document

vendor-overwrites/csslint/csslint-worker.js

@@ -2627,9 +2627,12 @@ Parser.prototype = function() {
 
                         if (value === null) {
                             break;
-                        } else {
-                            values.push(value);
                         }
+                        const last = values[values.length - 1];
+                        if (last && last.line === value.line && last.col === value.col && last.text === value.text) {
+                            break;
+                        }
+                        values.push(value);
                     } while (true);
                 }
 
@@ -2731,6 +2734,13 @@ Parser.prototype = function() {
                             }
                         }
 
+                        if (value === null) {
+                            const usoVar = this._isUsoVar();
+                            if (usoVar) {
+                                ([line, col, value] = usoVar);
+                            }
+                        }
+
                         /*if (value === null) {
                             return null;
                             //throw new Error("Expected identifier at line " + tokenStream.token().startLine + ", character " +  tokenStream.token().startCol + ".");
@@ -3173,6 +3183,21 @@ Parser.prototype = function() {
             },
 
 
+            _isUsoVar() {
+                const tokenStream = this._tokenStream;
+                for (let i = tokenStream._ltIndex - 1; i >= 0; i--) {
+                    const {type, value, startLine, startCol} = tokenStream._lt[i];
+                    if (type === tokenStream._tokenData.S) {
+                        // NOP
+                    } else if (type === tokenStream._tokenData.COMMENT &&
+                            value[2] === '[' && value[3] === '[' && value.endsWith(']]*/')) {
+                        return [startLine, startCol, value];
+                    } else {
+                        return false;
+                    }
+                }
+            },
+
             /**
              * Throws an error when an unexpected token is found.
              * @param {Object} token The token that was found.
@@ -3181,17 +3206,6 @@ Parser.prototype = function() {
              * @private
              */
             _unexpectedToken: function(token) {
-                for (let i = tokenStream._ltIndex - 1; i >= 0; i--) {
-                    const {type, value} = tokenStream._lt[i];
-                    if (type === tokenStream._tokenData.S) {
-                        // NOP
-                    } else if (type === tokenStream._tokenData.COMMENT &&
-                            value[2] === '[' && value[3] === '[' && value.endsWith(']]*/')) {
-                        return;
-                    } else {
-                        break;
-                    }
-                }
                 throw new SyntaxError("Unexpected token '" + token.value + "' at line " + token.startLine + ", col " + token.startCol + ".", token.startLine, token.startCol);
             },
 
@@ -10979,6 +10993,8 @@ CSSLint.addFormatter({
     }
 });
 
+parserlib.css.Tokens[parserlib.css.Tokens.COMMENT].hide = false;
+
 self.onmessage = ({data: {action = 'run', code, config}}) => {
   switch (action) {
 
@@ -10997,7 +11013,7 @@ self.onmessage = ({data: {action = 'run', code, config}}) => {
         // the functions are non-tranferable and we need only an id
         m.rule = {id: m.rule.id};
         return m;
-      }));
+      }).filter(m => !m.message.includes('/*[[') && !m.message.includes(']]*/')));
       return;
 
     case 'parse':