Apply allowInPropTypes option to class property

lib/rules/forbid-foreign-prop-types.js

@@ -52,6 +52,18 @@ module.exports = {
       return null;
     }
 
+    function findParentClassProperty(node) {
+      let parent = node.parent;
+
+      while (parent && parent.type !== 'Program') {
+        if (parent.type === 'ClassProperty') {
+          return parent;
+        }
+        parent = parent.parent;
+      }
+      return null;
+    }
+
     function isAllowedAssignment(node) {
       if (!allowInPropTypes) {
         return false;
@@ -67,6 +79,16 @@ module.exports = {
       ) {
         return true;
       }
+
+      const classProperty = findParentClassProperty(node);
+
+      if (
+        classProperty &&
+        classProperty.key &&
+        classProperty.key.name === 'propTypes'
+      ) {
+        return true;
+      }
       return false;
     }
 

tests/lib/rules/forbid-foreign-prop-types.js

@@ -62,6 +62,19 @@ ruleTester.run('forbid-foreign-prop-types', rule, {
     options: [{
       allowInPropTypes: true
     }]
+  },
+  {
+    code: `
+      class MyComponent extends React.Component {
+        static propTypes = {
+          baz: Qux.propTypes.baz
+        };
+      }
+    `,
+    parser: 'babel-eslint',
+    options: [{
+      allowInPropTypes: true
+    }]
   }],
 
   invalid: [{
@@ -170,5 +183,22 @@ ruleTester.run('forbid-foreign-prop-types', rule, {
       message: ERROR_MESSAGE,
       type: 'Identifier'
     }]
+  },
+  {
+    code: `
+      class MyComponent extends React.Component {
+        static propTypes = {
+          baz: Qux.propTypes.baz
+        };
+      }
+    `,
+    parser: 'babel-eslint',
+    options: [{
+      allowInPropTypes: false
+    }],
+    errors: [{
+      message: ERROR_MESSAGE,
+      type: 'Identifier'
+    }]
   }]
 });