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node_modules/eslint-plugin-react/lib/rules/jsx-uses-vars.js

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+/**
+ * @fileoverview Prevent variables used in JSX to be marked as unused
+ * @author Yannick Croissant
+ */
+
+'use strict';
+
+const docsUrl = require('../util/docsUrl');
+
+// ------------------------------------------------------------------------------
+// Rule Definition
+// ------------------------------------------------------------------------------
+
+module.exports = {
+  meta: {
+    docs: {
+      description: 'Prevent variables used in JSX to be marked as unused',
+      category: 'Best Practices',
+      recommended: true,
+      url: docsUrl('jsx-uses-vars')
+    },
+    schema: []
+  },
+
+  create(context) {
+    return {
+      JSXOpeningElement(node) {
+        let name;
+        if (node.name.namespace && node.name.namespace.name) {
+          // <Foo:Bar>
+          name = node.name.namespace.name;
+        } else if (node.name.name) {
+          // <Foo>
+          name = node.name.name;
+        } else if (node.name.object) {
+          // <Foo...Bar>
+          let parent = node.name.object;
+          while (parent.object) {
+            parent = parent.object;
+          }
+          name = parent.name;
+        } else {
+          return;
+        }
+
+        context.markVariableAsUsed(name);
+      }
+
+    };
+  }
+};