From e68461ff3b2d8fa9228eae4479146a638c5d7f0c Mon Sep 17 00:00:00 2001
From: Yo Takezawa <takezawa.yo@tis.co.jp>
Date: Mon, 12 Nov 2018 11:13:21 +0900
Subject: [PATCH] Apply allowInPropTypes option to class property

---
 lib/rules/forbid-foreign-prop-types.js | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/lib/rules/forbid-foreign-prop-types.js b/lib/rules/forbid-foreign-prop-types.js
index ba944f94e8..b5a829f631 100644
--- a/lib/rules/forbid-foreign-prop-types.js
+++ b/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;
     }