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node_modules/eslint-plugin-react/lib/rules/react-in-jsx-scope.js

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+/**
+ * @fileoverview Prevent missing React when using JSX
+ * @author Glen Mailer
+ */
+
+'use strict';
+
+const variableUtil = require('../util/variable');
+const pragmaUtil = require('../util/pragma');
+const docsUrl = require('../util/docsUrl');
+
+// -----------------------------------------------------------------------------
+// Rule Definition
+// -----------------------------------------------------------------------------
+
+module.exports = {
+  meta: {
+    docs: {
+      description: 'Prevent missing React when using JSX',
+      category: 'Possible Errors',
+      recommended: true,
+      url: docsUrl('react-in-jsx-scope')
+    },
+    schema: []
+  },
+
+  create(context) {
+    const pragma = pragmaUtil.getFromContext(context);
+    const NOT_DEFINED_MESSAGE = '\'{{name}}\' must be in scope when using JSX';
+
+    function checkIfReactIsInScope(node) {
+      const variables = variableUtil.variablesInScope(context);
+      if (variableUtil.findVariable(variables, pragma)) {
+        return;
+      }
+      context.report({
+        node,
+        message: NOT_DEFINED_MESSAGE,
+        data: {
+          name: pragma
+        }
+      });
+    }
+
+    return {
+      JSXOpeningElement: checkIfReactIsInScope,
+      JSXOpeningFragment: checkIfReactIsInScope
+    };
+  }
+};