add book.js

node_modules/lodash/internal/baseAssign.js

@@ -0,0 +1,19 @@
+var baseCopy = require('./baseCopy'),
+    keys = require('../object/keys');
+
+/**
+ * The base implementation of `_.assign` without support for argument juggling,
+ * multiple sources, and `customizer` functions.
+ *
+ * @private
+ * @param {Object} object The destination object.
+ * @param {Object} source The source object.
+ * @returns {Object} Returns `object`.
+ */
+function baseAssign(object, source) {
+  return source == null
+    ? object
+    : baseCopy(source, keys(source), object);
+}
+
+module.exports = baseAssign;