From 2f6a9aa699eb653bc5d8c15e8abcf20a6d8da254 Mon Sep 17 00:00:00 2001
From: Jordan Harband <ljharb@gmail.com>
Date: Sat, 18 May 2019 09:33:53 -0700
Subject: [PATCH] [Fix] correction to #80

---
 src/values/expressions/index.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/values/expressions/index.js b/src/values/expressions/index.js
index 9dbca62..26b9d39 100644
--- a/src/values/expressions/index.js
+++ b/src/values/expressions/index.js
@@ -73,7 +73,10 @@ export default function extract(value) {
   let { type } = expression;
 
   while (type === 'TSNonNullExpression' || type === 'TSAsExpression') {
-    ({ expression, type } = expression);
+    ({ type } = expression);
+    if (expression.expression) {
+      ({ expression } = expression);
+    }
   }
 
   if (TYPES[type] === undefined) {