Add @flow to unicodeRegexes and change to ES6 exports.

src/domTree.js

@@ -7,7 +7,7 @@
  *
  * Similar functions for working with MathML nodes exist in mathMLTree.js.
  */
-import unicodeRegexes from "./unicodeRegexes";
+import {cjkRegex, hangulRegex} from "./unicodeRegexes";
 import utils from "./utils";
 
 /**
@@ -222,11 +222,11 @@ class symbolNode {
         // fonts to use.  This allows us to render these characters with a serif
         // font in situations where the browser would either default to a sans serif
         // or render a placeholder character.
-        if (unicodeRegexes.cjkRegex.test(value)) {
+        if (cjkRegex.test(value)) {
             // I couldn't find any fonts that contained Hangul as well as all of
             // the other characters we wanted to test there for it gets its own
             // CSS class.
-            if (unicodeRegexes.hangulRegex.test(value)) {
+            if (hangulRegex.test(value)) {
                 this.classes.push('hangul_fallback');
             } else {
                 this.classes.push('cjk_fallback');

src/unicodeRegexes.js

@@ -1,4 +1,5 @@
-const hangulRegex = /[\uAC00-\uD7AF]/;
+// @flow
+export const hangulRegex = /[\uAC00-\uD7AF]/;
 
 // This regex combines
 // - CJK symbols and punctuation: [\u3000-\u303F]
@@ -8,10 +9,5 @@ const hangulRegex = /[\uAC00-\uD7AF]/;
 // - Hangul syllables: [\uAC00-\uD7AF]
 // - Fullwidth punctuation: [\uFF00-\uFF60]
 // Notably missing are halfwidth Katakana and Romanji glyphs.
-const cjkRegex =
+export const cjkRegex =
     /[\u3000-\u30FF\u4E00-\u9FAF\uAC00-\uD7AF\uFF00-\uFF60]/;
-
-module.exports = {
-    cjkRegex: cjkRegex,
-    hangulRegex: hangulRegex,
-};