use ternay rather than property lookup

Author: gnoff

packages/react-dom/src/server/ReactDOMServerFormatConfig.js

@@ -84,19 +84,14 @@ const startModuleSrc = stringToPrecomputedChunk('<script type="module" src="');
 const endAsyncScript = stringToPrecomputedChunk('" async=""></script>');
 
 const scriptRegex = /(<\/|<)(s)(cript)/gi;
-const substitutions = {
-  s: '\\u0073',
-  S: '\\u0053',
-};
+const scriptReplacer = (match, prefix, s, suffix) =>
+  `${prefix}${s === 's' ? '\\u0073' : '\\u0053'}${suffix}`;
 
 function escapeBootstrapScriptContent(scriptText) {
   if (__DEV__) {
     checkHtmlStringCoercion(scriptText);
   }
-  return ('' + scriptText).replace(
-    scriptRegex,
-    (match, prefix, s, suffix) => `${prefix}${substitutions[s]}${suffix}`,
-  );
+  return ('' + scriptText).replace(scriptRegex, scriptReplacer);
 }
 
 // Allows us to keep track of what we've already written so we can refer back to it.