From 1bbe0d921514cec6a118df4c3e1b7ba276c7ca7b Mon Sep 17 00:00:00 2001
From: Richard Hansen <rhansen@rhansen.org>
Date: Mon, 25 Oct 2021 05:17:18 -0400
Subject: [PATCH] Changeset: Use `in` check to help TypeScript narrowing

---
 src/static/js/Changeset.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/static/js/Changeset.js b/src/static/js/Changeset.js
index d261db74899..21de89c43da 100644
--- a/src/static/js/Changeset.js
+++ b/src/static/js/Changeset.js
@@ -649,7 +649,7 @@ const textLinesMutator = (lines) => {
    * @returns {string}
    */
   const linesGet = (idx) => {
-    if (lines.get) {
+    if ('get' in lines) {
       return lines.get(idx);
     } else {
       return lines[idx];