WIP - add extractor, generate snippet_data

node_modules/fbjs/lib/cx.js.flow

@@ -0,0 +1,37 @@
+/**
+ * Copyright (c) 2013-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @providesModule cx
+ */
+
+/**
+ * This function is used to mark string literals representing CSS class names
+ * so that they can be transformed statically. This allows for modularization
+ * and minification of CSS class names.
+ *
+ * In static_upstream, this function is actually implemented, but it should
+ * eventually be replaced with something more descriptive, and the transform
+ * that is used in the main stack should be ported for use elsewhere.
+ *
+ * @param string|object className to modularize, or an object of key/values.
+ *                      In the object case, the values are conditions that
+ *                      determine if the className keys should be included.
+ * @param [string ...]  Variable list of classNames in the string case.
+ * @return string       Renderable space-separated CSS className.
+ */
+function cx(classNames) {
+  if (typeof classNames == 'object') {
+    return Object.keys(classNames).filter(className => classNames[className]).map(replace).join(' ');
+  }
+
+  return Array.prototype.map.call(arguments, replace).join(' ');
+}
+
+function replace(str) {
+  return str.replace(/\//g, '-');
+}
+
+module.exports = cx;