Performance gains on no-custom-classname and no-contradicting-classname (#42)

* feat: move file parsing & group generation out of hot code path
* feat: move group generation out of hot code path

Author: larrifax

lib/rules/no-contradicting-classname.js

@@ -61,6 +61,9 @@ module.exports = {
     // Helpers
     //----------------------------------------------------------------------
 
+    // Init assets before sorting
+    const groups = groupUtil.getGroups(defaultGroups, mergedConfig);
+
     /**
      * Parse the classnames and report found conflicts
      * @param {Array} classNames
@@ -69,7 +72,6 @@ module.exports = {
     const parseForContradictingClassNames = (classNames, node) => {
       classNames = attrUtil.sanitizeClassnames(classNames);
       // Init assets before sorting
-      const groups = groupUtil.getGroups(defaultGroups, mergedConfig);
       const sorted = groupUtil.initGroupSlots(groups);
 
       // Move each classname inside its dedicated group

lib/rules/no-custom-classname.js

@@ -74,16 +74,17 @@ module.exports = {
     // Helpers
     //----------------------------------------------------------------------
 
+    // Init assets before sorting
+    const groups = groupUtil.getGroups(defaultGroups, mergedConfig);
+    const classnamesFromFiles = getClassnamesFromCSS(cssFiles);
+
     /**
      * Parse the classnames and report found conflicts
      * @param {Array} classNames
      * @param {ASTNode} node
      */
     const parseForCustomClassNames = (classNames, node) => {
       classNames = attrUtil.sanitizeClassnames(classNames);
-      // Init assets before sorting
-      const groups = groupUtil.getGroups(defaultGroups, mergedConfig);
-      const classnamesFromFiles = getClassnamesFromCSS(cssFiles);
 
       classNames.forEach((className) => {
         const idx = groupUtil.getGroupIndex(className, groups, mergedConfig.separator);