Escape text implementation with both typeof checking and regex pretes…

…ting

src/renderers/dom/shared/escapeTextContentForBrowser.js

@@ -32,7 +32,20 @@ function escaper(match) {
  * @return {string} An escaped string.
  */
 function escapeTextContentForBrowser(text) {
-  return ('' + text).replace(ESCAPE_REGEX, escaper);
+  switch (typeof text) {
+    case 'boolean':
+    case 'number':
+      // this shortcircuit helps perf for types that we know will never have
+      // special characters, especially given that this function is used often
+      // for numeric dom ids.
+      return '' + text;
+    default:
+      text = ('' + text);
+      if (ESCAPE_REGEX.test(text)) {
+        return text.replace(ESCAPE_REGEX, escaper);
+      }
+      return text;
+  }
 }
 
 module.exports = escapeTextContentForBrowser;