Bump to v3.7.0.

internal/baseAssign.js

@@ -1,35 +1,40 @@
 import baseCopy from './baseCopy';
+import getSymbols from './getSymbols';
+import isNative from '../lang/isNative';
 import keys from '../object/keys';
 
+/** Native method references. */
+var preventExtensions = isNative(Object.preventExtensions = Object.preventExtensions) && preventExtensions;
+
+/** Used as `baseAssign`. */
+var nativeAssign = (function() {
+  // Avoid `Object.assign` in Firefox 34-37 which have an early implementation
+  // with a now defunct try/catch behavior. See https://bugzilla.mozilla.org/show_bug.cgi?id=1103344
+  // for more details.
+  //
+  // Use `Object.preventExtensions` on a plain object instead of simply using
+  // `Object('x')` because Chrome and IE fail to throw an error when attempting
+  // to assign values to readonly indexes of strings in strict mode.
+  var object = { '1': 0 },
+      func = preventExtensions && isNative(func = Object.assign) && func;
+
+  try { func(preventExtensions(object), 'xo'); } catch(e) {}
+  return !object[1] && func;
+}());
+
 /**
  * The base implementation of `_.assign` without support for argument juggling,
- * multiple sources, and `this` binding `customizer` functions.
+ * multiple sources, and `customizer` functions.
  *
  * @private
  * @param {Object} object The destination object.
  * @param {Object} source The source object.
- * @param {Function} [customizer] The function to customize assigning values.
- * @returns {Object} Returns the destination object.
+ * @returns {Object} Returns `object`.
  */
-function baseAssign(object, source, customizer) {
-  var props = keys(source);
-  if (!customizer) {
-    return baseCopy(source, object, props);
-  }
-  var index = -1,
-      length = props.length;
-
-  while (++index < length) {
-    var key = props[index],
-        value = object[key],
-        result = customizer(value, source[key], key, object, source);
-
-    if ((result === result ? (result !== value) : (value === value)) ||
-        (typeof value == 'undefined' && !(key in object))) {
-      object[key] = result;
-    }
-  }
-  return object;
-}
+var baseAssign = nativeAssign || function(object, source) {
+  return source == null
+    ? object
+    : baseCopy(source, getSymbols(source), baseCopy(source, keys(source), object));
+};
 
 export default baseAssign;