From 459cbed33b104f9d448df076e8c9903f253f8b78 Mon Sep 17 00:00:00 2001
From: zuckjet <zuckjet@gmail.com>
Date: Fri, 4 Feb 2022 12:02:58 +0800
Subject: [PATCH] refactor(dev-infra): convert nullish coalescing operator to
 plain javascript (#44968)

low version nodejs doesn't support nullish coalescing operator very well

PR Close #44968
---
 tools/postinstall-patches.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/postinstall-patches.js b/tools/postinstall-patches.js
index 0af340c046a..4e22d1ea47d 100644
--- a/tools/postinstall-patches.js
+++ b/tools/postinstall-patches.js
@@ -68,7 +68,8 @@ const captureNgDevPatches = (files, patches) =>
     patches.forEach(p => _captureNgDevPatch(p[0], p[1], files));
 const _captureNgDevPatch = (search, replace, files) => {
   for (const fileName of files) {
-    const currentPatches = ngDevPatches.get(fileName) ?? [];
+    const patches = ngDevPatches.get(fileName);
+    const currentPatches = (patches !== null && patches !== undefined) ? patches : [];
     ngDevPatches.set(fileName, [...currentPatches, [search, replace]]);
   }
 };