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node_modules/eslint-plugin-react/lib/rules/jsx-no-duplicate-props.js

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+/**
+ * @fileoverview Enforce no duplicate props
+ * @author Markus Ånöstam
+ */
+
+'use strict';
+
+const has = require('has');
+const docsUrl = require('../util/docsUrl');
+
+// ------------------------------------------------------------------------------
+// Rule Definition
+// ------------------------------------------------------------------------------
+
+module.exports = {
+  meta: {
+    docs: {
+      description: 'Enforce no duplicate props',
+      category: 'Possible Errors',
+      recommended: true,
+      url: docsUrl('jsx-no-duplicate-props')
+    },
+
+    schema: [{
+      type: 'object',
+      properties: {
+        ignoreCase: {
+          type: 'boolean'
+        }
+      },
+      additionalProperties: false
+    }]
+  },
+
+  create(context) {
+    const configuration = context.options[0] || {};
+    const ignoreCase = configuration.ignoreCase || false;
+
+    return {
+      JSXOpeningElement(node) {
+        const props = {};
+
+        node.attributes.forEach((decl) => {
+          if (decl.type === 'JSXSpreadAttribute') {
+            return;
+          }
+
+          let name = decl.name.name;
+
+          if (typeof name !== 'string') {
+            return;
+          }
+
+          if (ignoreCase) {
+            name = name.toLowerCase();
+          }
+
+          if (has(props, name)) {
+            context.report({
+              node: decl,
+              message: 'No duplicate props allowed'
+            });
+          } else {
+            props[name] = 1;
+          }
+        });
+      }
+    };
+  }
+};