Do not store entire stdout in memory.

lib/child-promise.js

@@ -20,40 +20,42 @@ module.exports = function childPromise(cmd, args, file, dir, mute) {
     var childErrMsg = '[Child Error] ' + file + "\n\n";
     var child;
 
-    if (!mute) {
-      say('[Output: ' + cmd + '] ' + file + "\n", 'debug');
-    }
-
-    child = environment.windows ?
-        // Use exec() and special escape syntax for Windows
-        exec(windowsCommand(cmd, args), opts) :
-        // Use spawn() and normal syntax for non-Windows
-        spawn(cmd, args, opts);
-
-    function dataHandler(data) {
-      data = data.toString();
-      buff += data;
+    var dataHandler = function dataHandler(data) {
+      data = data.toString().trim();
+      // Only keep the last packet of data to prevent large
+      // amount of output being saved in memory
+      buff = !/\n/.test(data) ? buff + data : data;
       if (!mute) {
-        console.log(data.trim() + "\n");
+        console.log(data + "\n");
       }
     }
 
-    function stdErrHandler(data) {
+    var stdErrHandler = function stdErrHandler(data) {
       errs += data.toString();
     }
 
-    function errHandler(err) {
+    var errHandler = function errHandler(err) {
       rej(new Error(childErrMsg + err.toString().trim() + "\n"));
     }
 
-    function closeHandler(code) {
+    var closeHandler = function closeHandler(code) {
       if (code !== 0) {
         errHandler(errs);
       } else {
         acc(buff);
       }
     }
 
+    if (!mute) {
+      say('[Output: ' + cmd + '] ' + file + "\n", 'debug');
+    }
+
+    child = environment.windows ?
+        // Use exec() and special escape syntax for Windows
+        exec(windowsCommand(cmd, args), opts) :
+        // Use spawn() and normal syntax for non-Windows
+        spawn(cmd, args, opts);
+
     child.stdout.on('data', dataHandler);
     child.stderr.on('data', stdErrHandler);
     child.on('close', closeHandler);