Add a Node.js code watcher. It's not a separate process, so it can check require.cache for files it should watch. Currently unused due to missing SIGHUP handlers.

lib/util/refresh.js

@@ -0,0 +1,21 @@
+var fs = require('fs')
+
+var watchers = Object.create(null)
+
+function refresh() {
+  process.kill('SIGHUP')
+}
+
+function collect() {
+  Object.keys(require.cache).forEach(function(path) {
+    if (!watchers[path]) {
+      if (path.indexOf('node_modules') === -1) {
+        watchers[path] = fs.watch(path, refresh)
+      }
+    }
+  })
+}
+
+module.exports = function() {
+  collect()
+}