From dd10c3fc709feccc9acd642ad16795dd86c78fa2 Mon Sep 17 00:00:00 2001
From: Ting-Hsiang Hsu <hsuting0106@gmail.com>
Date: Thu, 13 Jun 2019 22:11:54 +0800
Subject: [PATCH] fix: fix error with other cases (#412)

---
 src/rules/useFlowType.js              | 8 +++++++-
 tests/rules/assertions/useFlowType.js | 6 ++++++
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/src/rules/useFlowType.js b/src/rules/useFlowType.js
index dba4d23d..cb612f58 100644
--- a/src/rules/useFlowType.js
+++ b/src/rules/useFlowType.js
@@ -36,8 +36,14 @@ const create = (context) => {
     TypeParameterDeclaration (node) {
       node.params.forEach((param) => {
         if (param.default && param.default.typeParameters) {
+          if (param.default.type === 'GenericTypeAnnotation') {
+            markTypeAsUsedWithGenericType(param.default);
+          }
+
           param.default.typeParameters.params.forEach((typeParameterNode) => {
-            markTypeAsUsedWithGenericType(typeParameterNode);
+            if (typeParameterNode.type === 'GenericTypeAnnotation') {
+              markTypeAsUsedWithGenericType(typeParameterNode);
+            }
           });
         }
       });
diff --git a/tests/rules/assertions/useFlowType.js b/tests/rules/assertions/useFlowType.js
index 526b91c5..b002ad35 100644
--- a/tests/rules/assertions/useFlowType.js
+++ b/tests/rules/assertions/useFlowType.js
@@ -40,6 +40,12 @@ const VALID_WITH_USE_FLOW_TYPE = [
     errors: [
       '\'A\' is defined but never used.'
     ]
+  },
+  {
+    code: 'import type A from "a"; type X<B = A<string>> = { b: B }; let x: X; console.log(x);',
+    errors: [
+      '\'A\' is defined but never used.'
+    ]
   }
 ];