add book.js

node_modules/lodash/internal/metaMap.js

@@ -0,0 +1,9 @@
+var getNative = require('./getNative');
+
+/** Native method references. */
+var WeakMap = getNative(global, 'WeakMap');
+
+/** Used to store function metadata. */
+var metaMap = WeakMap && new WeakMap;
+
+module.exports = metaMap;