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node_modules/eslint-plugin-react/lib/rules/state-in-constructor.js

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+/**
+ * @fileoverview Enforce the state initialization style to be either in a constructor or with a class property
+ * @author Kanitkorn Sujautra
+ */
+
+'use strict';
+
+const Components = require('../util/Components');
+const docsUrl = require('../util/docsUrl');
+
+// ------------------------------------------------------------------------------
+// Rule Definition
+// ------------------------------------------------------------------------------
+
+module.exports = {
+  meta: {
+    docs: {
+      description: 'State initialization in an ES6 class component should be in a constructor',
+      category: 'Stylistic Issues',
+      recommended: false,
+      url: docsUrl('state-in-constructor')
+    },
+    schema: [{
+      enum: ['always', 'never']
+    }]
+  },
+
+  create: Components.detect((context, components, utils) => {
+    const option = context.options[0] || 'always';
+    return {
+      ClassProperty(node) {
+        if (
+          option === 'always' &&
+          !node.static &&
+          node.key.name === 'state' &&
+          utils.getParentES6Component()
+        ) {
+          context.report({
+            node,
+            message: 'State initialization should be in a constructor'
+          });
+        }
+      },
+      AssignmentExpression(node) {
+        if (
+          option === 'never' &&
+          utils.isStateMemberExpression(node.left) &&
+          utils.inConstructor() &&
+          utils.getParentES6Component()
+        ) {
+          context.report({
+            node,
+            message: 'State initialization should be in a class property'
+          });
+        }
+      }
+    };
+  })
+};