From 3d14a9a0272f3abd0c3bffd31a89df4313d4dd54 Mon Sep 17 00:00:00 2001
From: anseki <AnSeki.aff@gmail.com>
Date: Sat, 27 Jul 2019 21:55:29 +0900
Subject: [PATCH] Adjust for new `constants`.

---
 lib/readline-sync.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/readline-sync.js b/lib/readline-sync.js
index f34579d..97f15f8 100644
--- a/lib/readline-sync.js
+++ b/lib/readline-sync.js
@@ -269,6 +269,9 @@ function _readlineSync(options) {
       if (!fsB) {
         fsB = process.binding('fs'); // For raw device path
         constants = process.binding('constants');
+        // for v6.3.0+
+        constants = constants && constants.fs && typeof constants.fs.O_RDWR === 'number'
+          ? constants.fs : constants;
       }
       return fsB;
     }