Repository: yannickcr/eslint-plugin-react (js)

Issue:
Rule 'jsx-uses-vars': why not on by default?
Thanks for this plugin! Very cool.

I'm thinking about adopting this for my default setup across the org, but just wondering why `jsx-uses-vars` wouldn't be turned on by default (maybe to 'warn')? I guess the real question is: what's the use case for _not_ wanting to mark them used?

Also, I'm totally willing to PR a change, but just wanted to get your feedback first. And if the consensus is no rule should be on by default, can we invert the language of the rule to something like `jsx-ignore-var-usage`? 

Pull request description:
Enable jsx-uses-vars rule to WARN by default
From original issue: "just wondering why jsx-uses-vars wouldn't be turned on by default (maybe to 'warn')? I guess the real question is: what's the use case for not wanting to mark them used?"

Fixes #49

Patch:
diff --git a/index.js b/index.js
index 50af4db5..fcf197c3 100644
--- a/index.js
+++ b/index.js
@@ -27,7 +27,7 @@ module.exports = {
     'no-did-mount-set-state': 0,
     'no-did-update-set-state': 0,
     'react-in-jsx-scope': 0,
-    'jsx-uses-vars': 0,
+    'jsx-uses-vars': 1,
     'jsx-no-undef': 0,
     'jsx-quotes': 0,
     'no-unknown-property': 0,


Test patch:
diff --git a/tests/index.js b/tests/index.js
index 734899ad..958210ea 100644
--- a/tests/index.js
+++ b/tests/index.js
@@ -12,6 +12,10 @@ var rules = fs.readdirSync(path.resolve(__dirname, '../lib/rules/'))
     return path.basename(f, '.js');
   });
 
+var defaultSettings = {
+  'jsx-uses-vars': 1
+};
+
 describe('all rule files should be exported by the plugin', function() {
   rules.forEach(function(ruleName) {
     it('should export ' + ruleName, function() {
@@ -20,11 +24,22 @@ describe('all rule files should be exported by the plugin', function() {
         require(path.join('../lib/rules', ruleName))
       );
     });
-    it('should configure ' + ruleName + ' off by default', function() {
-      assert.equal(
-        plugin.rulesConfig[ruleName],
-        0
-      );
-    });
+
+    if (defaultSettings.hasOwnProperty(ruleName)) {
+      var val = defaultSettings[ruleName];
+      it('should configure ' + ruleName + ' to ' + val + ' by default', function() {
+        assert.equal(
+          plugin.rulesConfig[ruleName],
+          val
+        );
+      });
+    } else {
+      it('should configure ' + ruleName + ' off by default', function() {
+        assert.equal(
+          plugin.rulesConfig[ruleName],
+          0
+        );
+      });
+    }
   });
 });