Revert "Commit updated Javascript packages"

This reverts commit a88734348a.

build/javascript/node_modules/lodash/_isFlattenable.js

@@ -1,20 +0,0 @@
-var Symbol = require('./_Symbol'),
-    isArguments = require('./isArguments'),
-    isArray = require('./isArray');
-
-/** 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]);
-}
-
-module.exports = isFlattenable;