WIP - add extractor, generate snippet_data

node_modules/fbjs/lib/memoizeStringOnly.js.flow

@@ -0,0 +1,27 @@
+/**
+ * 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 memoizeStringOnly
+ * @flow
+ * @typechecks static-only
+ */
+'use strict';
+/**
+ * Memoizes the return value of a function that accepts one string argument.
+ */
+
+function memoizeStringOnly<T>(callback: (s: string) => T): (s: string) => T {
+  const cache = {};
+  return function (string) {
+    if (!cache.hasOwnProperty(string)) {
+      cache[string] = callback.call(this, string);
+    }
+
+    return cache[string];
+  };
+}
+
+module.exports = memoizeStringOnly;