First commit.

Signed-off-by: Chen Xiao <abigwc@gmail.com>

client/node_modules/lodash-es/_isFlattenable.js

@@ -0,0 +1,20 @@
+import Symbol from './_Symbol.js';
+import isArguments from './isArguments.js';
+import isArray from './isArray.js';
+
+/** Built-in value references. */
+var spreadableSymbol = Symbol ? Symbol.isConcatSpreadable : undefined;
+
+/**
+ * Checks if `value` is a flattenable `arguments` object or array.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is flattenable, else `false`.
+ */
+function isFlattenable(value) {
+  return isArray(value) || isArguments(value) ||
+    !!(spreadableSymbol && value && value[spreadableSymbol]);
+}
+
+export default isFlattenable;