Backported the old streams. Nasty if statements abound.

lib/appenders/file.js

@@ -1,10 +1,10 @@
 var layouts = require('../layouts')
-  , path = require('path')
-  , fs = require('fs')
-  , streams = require('../streams')
-  , os = require('os')
-  , eol = os.EOL || '\n'
-  , openFiles = [];
+, path = require('path')
+, fs = require('fs')
+, semver = require('semver')
+, os = require('os')
+, eol = os.EOL || '\n'
+, openFiles = [];
 
 //close open files on process exit.
 process.on('exit', function() {
@@ -22,7 +22,7 @@ process.on('exit', function() {
  * @param numBackups - the number of log files to keep after logSize has been reached (default 5)
  */
 function fileAppender (file, layout, logSize, numBackups) {
-  var bytesWritten = 0;
+  var logFile;
   file = path.normalize(file);
   layout = layout || layouts.basicLayout;
   numBackups = numBackups === undefined ? 5 : numBackups;
@@ -30,7 +30,9 @@ function fileAppender (file, layout, logSize, numBackups) {
   numBackups = numBackups === 0 ? 1 : numBackups;
 
   function openTheStream(file, fileSize, numFiles) {
-    var stream;
+    var stream
+    , streams = require('../streams');
+
     if (fileSize) {
       stream = new streams.RollingFileStream(
         file,
@@ -46,7 +48,31 @@ function fileAppender (file, layout, logSize, numBackups) {
     return stream;
   }
 
-  var logFile = openTheStream(file, logSize, numBackups);
+  function openTheOldStyleStream(file, fileSize, numFiles) {
+    var stream
+    , streams = require('../old-streams');
+    if (fileSize) {
+      stream = new streams.BufferedWriteStream(
+        new streams.RollingFileStream(
+          file,
+          fileSize,
+          numFiles
+        )
+      );
+    } else {
+      stream = new streams.BufferedWriteStream(fs.createWriteStream(file, { encoding: "utf8", mode: 0644, flags: 'a' }));
+    }
+    stream.on("error", function (err) {
+      console.error("log4js.fileAppender - Writing to file %s, error happened ", file, err);
+    });
+    return stream;
+  }
+
+  if (semver.satisfies(process.version, '>=0.10.0')) {
+    logFile = openTheStream(file, logSize, numBackups);
+  } else {
+    logFile = openTheOldStyleStream(file, logSize, numBackups);
+  }
   
   // push file to the stack of open handlers
   openFiles.push(logFile);