Added the underscore node_module.

node_modules/underscore/modules/_collectNonEnumProps.js

@@ -0,0 +1,40 @@
+import { nonEnumerableProps, ObjProto } from './_setup.js';
+import isFunction from './isFunction.js';
+import has from './_has.js';
+
+// Internal helper to create a simple lookup structure.
+// `collectNonEnumProps` used to depend on `_.contains`, but this led to
+// circular imports. `emulatedSet` is a one-off solution that only works for
+// arrays of strings.
+function emulatedSet(keys) {
+  var hash = {};
+  for (var l = keys.length, i = 0; i < l; ++i) hash[keys[i]] = true;
+  return {
+    contains: function(key) { return hash[key] === true; },
+    push: function(key) {
+      hash[key] = true;
+      return keys.push(key);
+    }
+  };
+}
+
+// Internal helper. Checks `keys` for the presence of keys in IE < 9 that won't
+// be iterated by `for key in ...` and thus missed. Extends `keys` in place if
+// needed.
+export default function collectNonEnumProps(obj, keys) {
+  keys = emulatedSet(keys);
+  var nonEnumIdx = nonEnumerableProps.length;
+  var constructor = obj.constructor;
+  var proto = (isFunction(constructor) && constructor.prototype) || ObjProto;
+
+  // Constructor is a special case.
+  var prop = 'constructor';
+  if (has(obj, prop) && !keys.contains(prop)) keys.push(prop);
+
+  while (nonEnumIdx--) {
+    prop = nonEnumerableProps[nonEnumIdx];
+    if (prop in obj && obj[prop] !== proto[prop] && !keys.contains(prop)) {
+      keys.push(prop);
+    }
+  }
+}