[eslint-v2][arrow functions] add no-confusing-arrow rule

Author: hshoff

README.md

@@ -817,6 +817,19 @@ Other Style Guides
     });
     ```
 
+  - [8.5](#8.5) <a name='8.5'></a> Avoid confusing arrow function syntax (`=>`) with comparison operators (`<=`, `>=`). eslint: [no-confusing-arrow](http://eslint.org/docs/rules/no-confusing-arrow)
+
+    ```js
+    // bad
+    const isActive = item => item.height > 256 ? true : false;
+
+    // bad
+    const isActive = (item) => item.height > 256 ? true : false;
+
+    // good
+    const isActive = item => { return item.height > 256 ? true : false; }
+    ```
+
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packages/eslint-config-airbnb/rules/es6.js

@@ -28,6 +28,9 @@ module.exports = {
     'generator-star-spacing': 0,
     // disallow modifying variables of class declarations
     'no-class-assign': 0,
+    // disallow arrow functions where they could be confused with comparisons
+    // http://eslint.org/docs/rules/no-confusing-arrow
+    'no-confusing-arrow': 2,
     // disallow modifying variables that are declared using const
     'no-const-assign': 2,
     // disallow specific imports