From c00efe56f4fb07d27eb1d47915288b027b3ef692 Mon Sep 17 00:00:00 2001
From: "Alex Lam S.L" <alexlamsl@gmail.com>
Date: Mon, 28 Dec 2020 05:32:07 +0000
Subject: [PATCH] workaround asynchronous tty bugs on Node.js (#4473)

---
 bin/uglifyjs        |  2 +-
 test/compress.js    |  2 +-
 test/jetstream.js   |  2 +-
 test/ufuzz/index.js |  2 +-
 tools/exit.js       | 15 ---------------
 tools/tty.js        | 22 ++++++++++++++++++++++
 6 files changed, 26 insertions(+), 19 deletions(-)
 delete mode 100644 tools/exit.js
 create mode 100644 tools/tty.js

diff --git a/bin/uglifyjs b/bin/uglifyjs
index 4d1fb5a2..ed01f986 100755
--- a/bin/uglifyjs
+++ b/bin/uglifyjs
@@ -3,7 +3,7 @@
 
 "use strict";
 
-require("../tools/exit");
+require("../tools/tty");
 
 var fs = require("fs");
 var info = require("../package.json");
diff --git a/test/compress.js b/test/compress.js
index f35159b0..29ea5a4f 100644
--- a/test/compress.js
+++ b/test/compress.js
@@ -1,6 +1,6 @@
 "use strict";
 
-require("../tools/exit");
+require("../tools/tty");
 
 var assert = require("assert");
 var child_process = require("child_process");
diff --git a/test/jetstream.js b/test/jetstream.js
index 1eebdc6b..25cf1290 100644
--- a/test/jetstream.js
+++ b/test/jetstream.js
@@ -5,7 +5,7 @@
 
 var site = "https://browserbench.org/JetStream1.1";
 if (typeof phantom == "undefined") {
-    require("../tools/exit");
+    require("../tools/tty");
     var args = process.argv.slice(2);
     var debug = args.indexOf("--debug");
     if (debug < 0) {
diff --git a/test/ufuzz/index.js b/test/ufuzz/index.js
index 2eac44f0..e5bf0083 100644
--- a/test/ufuzz/index.js
+++ b/test/ufuzz/index.js
@@ -5,7 +5,7 @@
 // bin/uglifyjs s.js -c && bin/uglifyjs s.js -c passes=3 && bin/uglifyjs s.js -c passes=3 -m
 // cat s.js | node && node s.js && bin/uglifyjs s.js -c | node && bin/uglifyjs s.js -c passes=3 | node && bin/uglifyjs s.js -c passes=3 -m | node
 
-require("../../tools/exit");
+require("../../tools/tty");
 
 var UglifyJS = require("../..");
 var randomBytes = require("crypto").randomBytes;
diff --git a/tools/exit.js b/tools/exit.js
deleted file mode 100644
index 4dd7141b..00000000
--- a/tools/exit.js
+++ /dev/null
@@ -1,15 +0,0 @@
-// workaround for tty output truncation upon process.exit()
-var exit = process.exit;
-process.exit = function() {
-    var args = [].slice.call(arguments);
-    process.once("uncaughtException", function() {
-        (function callback() {
-            if (process.stdout.bufferSize || process.stderr.bufferSize) {
-                setTimeout(callback, 1);
-            } else {
-                exit.apply(process, args);
-            }
-        })();
-    });
-    throw exit;
-};
diff --git a/tools/tty.js b/tools/tty.js
new file mode 100644
index 00000000..395c48ec
--- /dev/null
+++ b/tools/tty.js
@@ -0,0 +1,22 @@
+// workaround for tty output truncation on Node.js
+try {
+    // prevent buffer overflow and other asynchronous bugs
+    process.stdout._handle.setBlocking(true);
+    process.stderr._handle.setBlocking(true);
+} catch (e) {
+    // ensure output buffers are flushed before process termination
+    var exit = process.exit;
+    process.exit = function() {
+        var args = [].slice.call(arguments);
+        process.once("uncaughtException", function() {
+            (function callback() {
+                if (process.stdout.bufferSize || process.stderr.bufferSize) {
+                    setTimeout(callback, 1);
+                } else {
+                    exit.apply(process, args);
+                }
+            })();
+        });
+        throw exit;
+    };
+}
-- 
2.34.1