1 files changed, 2 insertions, 2 deletions
diff --git a/node_modules/@babel/traverse/lib/path/inference/util.js b/node_modules/@babel/traverse/lib/path/inference/util.js
index 5017e20b..6cc43124 100644
--- a/node_modules/@babel/traverse/lib/path/inference/util.js
+++ b/node_modules/@babel/traverse/lib/path/inference/util.js
@@ -14,12 +14,12 @@ const {
 } = _t;
 function createUnionType(types) {
   {
-    if (isFlowType(types[0])) {
+    if (types.every(v => isFlowType(v))) {
       if (createFlowUnionType) {
         return createFlowUnionType(types);
       }
       return createUnionTypeAnnotation(types);
-    } else {
+    } else if (types.every(v => isTSType(v))) {
       if (createTSUnionType) {
         return createTSUnionType(types);
       }