From a62de758dc6c222941dd20404d86b898fde2478a Mon Sep 17 00:00:00 2001
From: Sean Lilley <lilleyse@gmail.com>
Date: Wed, 15 Sep 2021 11:57:28 -0400
Subject: [PATCH 1/2] Fix unhandled error when obj or mtl is missing

---
 lib/readLines.js | 35 +++++++++++++++++++----------------
 1 file changed, 19 insertions(+), 16 deletions(-)

diff --git a/lib/readLines.js b/lib/readLines.js
index 0977b1c..106e9be 100644
--- a/lib/readLines.js
+++ b/lib/readLines.js
@@ -2,6 +2,7 @@
 const fsExtra = require("fs-extra");
 const Promise = require("bluebird");
 const readline = require("readline");
+const events = require("events");
 
 module.exports = readLines;
 
@@ -15,23 +16,25 @@ module.exports = readLines;
  * @private
  */
 function readLines(path, callback) {
-  return new Promise(function (resolve, reject) {
-    const stream = fsExtra.createReadStream(path);
-    stream.on("error", reject);
-    stream.on("end", resolve);
+  const stream = fsExtra.createReadStream(path);
+  return events.once(stream, "open").then(function () {
+    return new Promise(function (resolve, reject) {
+      stream.on("error", reject);
+      stream.on("end", resolve);
 
-    const lineReader = readline.createInterface({
-      input: stream,
+      const lineReader = readline.createInterface({
+        input: stream,
+      });
+
+      const callbackWrapper = function (line) {
+        try {
+          callback(line);
+        } catch (error) {
+          reject(error);
+        }
+      };
+
+      lineReader.on("line", callbackWrapper);
     });
-
-    const callbackWrapper = function (line) {
-      try {
-        callback(line);
-      } catch (error) {
-        reject(error);
-      }
-    };
-
-    lineReader.on("line", callbackWrapper);
   });
 }

From ab060bb185b051eab75a49fe0911b0b912473f36 Mon Sep 17 00:00:00 2001
From: Sean Lilley <lilleyse@gmail.com>
Date: Wed, 15 Sep 2021 12:06:52 -0400
Subject: [PATCH 2/2] Update CHANGES.md

---
 CHANGES.md | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/CHANGES.md b/CHANGES.md
index 9688e18..f8f149d 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,5 +1,9 @@
 # Change Log
 
+### 3.1.3 - 2021-09-15
+
+- Fixed bug where missing .mtl files were no longer being handled gracefully in Node 16. [#268](https://github.com/CesiumGS/obj2gltf/pull/268)
+
 ### 3.1.2 - 2021-08-02
 
 - Removed `minFilter` and `magFilter` from generated samplers so that runtime engines can use their preferred texture filtering. [#240](https://github.com/CesiumGS/obj2gltf/pull/240)