Add UTFSequence module for common unicode usage

Summary:
A collection of Unicode sequences for various characters and emoji.

  - More explicit than using the sequences directly in code.
  - Source code should be limitted to ASCII.
  - Less chance of typos.

Reviewed By: TheSavior

Differential Revision: D6969065

fbshipit-source-id: c11ec96b74f5dfa7c624a3c53f3c29f6284a82b3

Libraries/UTFSequence.js

@@ -0,0 +1,35 @@
+/**
+ * Copyright (c) 2016-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ *
+ * @providesModule UTFSequence
+ * @flow
+ * @format
+ */
+
+'use strict';
+
+/**
+ * A collection of Unicode sequences for various characters and emoji.
+ *
+ *  - More explicit than using the sequences directly in code.
+ *  - Source code should be limitted to ASCII.
+ *  - Less chance of typos.
+ */
+const UTFSequence = {
+  MIDDOT: '\u00B7', // normal middle dot: ·
+  MIDDOT_SP: '\u00A0\u00B7\u00A0', //  · 
+  MIDDOT_KATAKANA: '\u30FB', // katakana middle dot
+  MDASH: '\u2014', // em dash: —
+  MDASH_SP: '\u00A0\u2014\u00A0', //  — 
+  NDASH: '\u2013', // en dash: –
+  NDASH_SP: '\u00A0\u2013\u00A0', //  – 
+  NBSP: '\u00A0', // non-breaking space:  
+  PIZZA: '\uD83C\uDF55',
+};
+
+module.exports = UTFSequence;