workaround asynchronous tty bugs on Node.js (#4473)

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;
+    };
+}