Add basic eslint project with working logic

lib/index.js

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+/**
+ * @fileoverview While using CSS Modules, disallow using (non-conditional / string) classNames in a JSX tag if it already has a styleName
+ * @author Abhas Bhattacharya
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+var requireIndex = require("requireindex");
+
+//------------------------------------------------------------------------------
+// Plugin Definition
+//------------------------------------------------------------------------------
+
+
+// import all rules in lib/rules
+module.exports.rules = requireIndex(__dirname + "/rules");
+
+
+

lib/rules/no-classname-with-stylename.js

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+/**
+ * @fileoverview Disallow string className alongwith styleName in the same JSX tag
+ * @author Abhas Bhattacharya
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+const reportText = "Do not use className alongwith styleName in same JSX tag. \nstyleName should compose from the className";
+
+module.exports = {
+    meta: {
+        docs: {
+            description: "Disallow string className alongwith styleName in the same JSX tag",
+            category: "Fill me in",
+            recommended: false
+        },
+        fixable: null,  // or "code" or "whitespace"
+        schema: [
+            // fill in your schema
+        ]
+    },
+
+    create: function (context) {
+
+        // variables should be defined here
+
+        //----------------------------------------------------------------------
+        // Helpers
+        //----------------------------------------------------------------------
+
+        // any helper functions should go here or else delete this section
+
+        //----------------------------------------------------------------------
+        // Public
+        //----------------------------------------------------------------------
+
+        return {
+            "JSXOpeningElement": function (node) {
+                const hasClassNameWithoutExpr = node.attributes.some((attr) => attr.name.name === "className" && (attr.value === null || attr.value.type !== 'JSXExpressionContainer'))
+                const hasStyleName = node.attributes.some((attr) => attr.name.name === "styleName");
+
+                if (hasClassNameWithoutExpr && hasStyleName) {
+                    context.report(node, reportText);
+                }
+            }
+        };
+    }
+};