Move logic to a function

Author: HenriqueLimas

packages/react-dom-bindings/src/server/ReactFizzConfigDOM.js

@@ -199,6 +199,19 @@ export type ExternalRuntimeScript = {
   src: string,
   chunks: Array<Chunk | PrecomputedChunk>,
 };
+
+/**
+ * We normalize crossOrigin to be "use-credentials", "" or null.
+ * Unless using "use-credentials" all the other strings behave like "anonymous" and "" is
+ * shortest bytes-wise.
+ */
+function getCrossOrigin(options?: mixed) {
+  return options == null || typeof options.crossOrigin !== 'string'
+    ? null
+    : options.crossOrigin === 'use-credentials'
+    ? 'use-credentials'
+    : '';
+}
 // Allows us to keep track of what we've already written so we can refer back to it.
 // if passed externalRuntimeConfig and the enableFizzExternalRuntime feature flag
 // is set, the server will send instructions via data attributes (instead of inline scripts)
@@ -267,12 +280,7 @@ export function createResponseState(
         typeof scriptConfig === 'string' ? scriptConfig : scriptConfig.src;
       const integrity =
         typeof scriptConfig === 'string' ? undefined : scriptConfig.integrity;
-      const crossOrigin =
-        typeof scriptConfig === 'string' || scriptConfig.crossOrigin == null
-          ? undefined
-          : scriptConfig.crossOrigin === 'use-credentials'
-          ? 'use-credentials'
-          : '';
+      const crossOrigin = getCrossOrigin(scriptConfig);
 
       bootstrapChunks.push(
         startScriptSrc,
@@ -306,12 +314,7 @@ export function createResponseState(
         typeof scriptConfig === 'string' ? scriptConfig : scriptConfig.src;
       const integrity =
         typeof scriptConfig === 'string' ? undefined : scriptConfig.integrity;
-      const crossOrigin =
-        typeof scriptConfig === 'string' || scriptConfig.crossOrigin == null
-          ? undefined
-          : scriptConfig.crossOrigin === 'use-credentials'
-          ? 'use-credentials'
-          : '';
+      const crossOrigin = getCrossOrigin(scriptConfig);
 
       bootstrapChunks.push(
         startModuleSrc,
@@ -5085,12 +5088,7 @@ export function preconnect(href: string, options?: ?{crossOrigin?: string}) {
   }
 
   if (typeof href === 'string' && href) {
-    const crossOrigin =
-      options == null || typeof options.crossOrigin !== 'string'
-        ? null
-        : options.crossOrigin === 'use-credentials'
-        ? 'use-credentials'
-        : '';
+    const crossOrigin = getCrossOrigin(options);
 
     const key = `[preconnect][${
       crossOrigin === null ? 'null' : crossOrigin