config(lint): stricter eslint configuration

and several newly-found unneeded regex escapes.

Author: AviVahl

.eslintrc

@@ -0,0 +1,12 @@
+{
+    "env": {
+        "browser": true,
+        "commonjs": true,
+        "es6": true,
+        "node": true
+    },
+    "extends": "eslint:recommended",
+    "parserOptions": {
+        "ecmaVersion": 2018
+    }
+}

.eslintrc.json

@@ -136,12 +136,12 @@ var parser = new Parser({
 		"url\\((\\s*)(\"(?:[^\\\\\"]|\\\\.)*\")(\\s*)\\)": urlMatch,
 		"url\\((\\s*)('(?:[^\\\\']|\\\\.)*')(\\s*)\\)": urlMatch,
 		"url\\((\\s*)((?:[^\\\\)'\"]|\\\\.)*)(\\s*)\\)": urlMatch,
-		"([\\w\-]+)\\((\\s*)": nestedItemMatch,
+		"([\\w-]+)\\((\\s*)": nestedItemMatch,
 		"(\\s*)(\\))": nestedItemEndMatch,
 		",(\\s*)": commaMatch,
 		"\\s+$": endSpacingMatch,
 		"\\s+": spacingMatch,
-		"[^\\s,\)]+": itemMatch
+		"[^\\s,)]+": itemMatch
 	}
 });
 

lib/parseValues.js

@@ -13,7 +13,7 @@ function escape(str, identifier) {
 	if (identifier) {
 		return str.replace(identifierEscapeRegexp, "\\$1");
 	} else {
-		return str.replace(/(^[^A-Za-z_\\-]|^\-\-|[^A-Za-z_0-9\\-])/g, "\\$1");
+		return str.replace(/(^[^A-Za-z_\\-]|^--|[^A-Za-z_0-9\\-])/g, "\\$1");
 	}
 }
 
@@ -60,6 +60,6 @@ function stringify(tree) {
 		str = str + tree.after;
 	}
 	return str;
-};
+}
 
 module.exports = stringify;