--- a/piecrust/plugins/builtin.py	Tue Jan 16 08:41:25 2018 -0800
+++ b/piecrust/plugins/builtin.py	Tue Jan 16 08:41:46 2018 -0800
@@ -120,6 +120,7 @@
             TextileFormatter()]
 
     def getProcessors(self):
+        from piecrust.processing.browserify import BrowserifyProcessor
         from piecrust.processing.compass import CompassProcessor
         from piecrust.processing.compressors import (
             CleanCssProcessor, UglifyJSProcessor)
@@ -132,6 +133,7 @@
         from piecrust.processing.util import ConcatProcessor
 
         return [
+            BrowserifyProcessor(),
             CopyFileProcessor(),
             ConcatProcessor(),
             PygmentsStyleProcessor(),

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/piecrust/processing/browserify.py	Tue Jan 16 08:41:46 2018 -0800
@@ -0,0 +1,57 @@
+import os
+import os.path
+import logging
+import platform
+import subprocess
+from piecrust.processing.base import Processor, PRIORITY_FIRST, FORCE_BUILD
+
+
+logger = logging.getLogger(__name__)
+
+
+class BrowserifyProcessor(Processor):
+    PROCESSOR_NAME = 'browserify'
+
+    def __init__(self):
+        super(BrowserifyProcessor, self).__init__()
+        self.priority = PRIORITY_FIRST
+        self.is_bypassing_structured_processing = True
+        self._conf = None
+
+    def initialize(self, app):
+        super(BrowserifyProcessor, self).initialize(app)
+
+        self._conf = app.config.get('browserify')
+        if self._conf is None:
+            return
+
+        if self._conf is True:
+            self._conf = {}
+
+        self._conf.setdefault('bin', 'browserify')
+
+    def matches(self, path):
+        return self._conf is not None and os.path.splitext(path)[1] == '.js'
+
+    def getDependencies(self, path):
+        return FORCE_BUILD
+
+    def process(self, path, out_dir):
+        _, fname = os.path.split(path)
+        out_path = os.path.join(out_dir, fname)
+
+        args = [self._conf['bin'], path, '-o', out_path]
+        cwd = self.app.root_dir
+        logger.debug("Running Browserify: %s" % ' '.join(args))
+        try:
+            retcode = subprocess.call(args, cwd=cwd)
+        except FileNotFoundError as ex:
+            logger.error("Tried running Browserify processor "
+                         "with command: %s" % args)
+            raise Exception("Error running Browserify. "
+                            "Did you install it?") from ex
+        if retcode != 0:
+            raise Exception("Error occured in Browserify compiler. "
+                            "Please check log messages above for "
+                            "more information.")
+        return True