Fixed fileSync appender to create directory recursively

lib/appenders/fileSync.js

@@ -11,6 +11,40 @@ function touchFile(file, options) {
     return;
   }
 
+  // attempt to create the directory
+  const mkdir = (dir) => {
+    try {
+      return fs.mkdirSync(dir, {recursive: true});
+    }
+    // backward-compatible fs.mkdirSync for nodejs pre-10.12.0 (without recursive option)
+    catch (e) {
+      // recursive creation of parent first
+      if (e.code === 'ENOENT') {
+        mkdir(path.dirname(dir));
+        return mkdir(dir);
+      }
+
+      // throw error for all except EEXIST and EROFS (read-only filesystem)
+      if (e.code !== 'EEXIST' && e.code !== 'EROFS') {
+        throw e;
+      }
+
+      // EEXIST: throw if file and not directory
+      // EROFS : throw if directory not found
+      else {
+        try {
+          if (fs.statSync(dir).isDirectory()) {
+            return dir;
+          }
+          throw e;
+        } catch (err) {
+          throw e;
+        }
+      }
+    }
+  };
+  mkdir(path.dirname(file));
+
   // touch the file to apply flags (like w to truncate the file)
   const id = fs.openSync(file, options.flags, options.mode);
   fs.closeSync(id);