Stop writing codegen files if it just changes new lines

change/@react-native-windows-codegen-e4cfdc4a-a4b9-4a36-8902-cc9aa78db21c.json

@@ -0,0 +1,7 @@
+{
+  "type": "prerelease",
+  "comment": "Stop writing codegen files if it just changes new lines",
+  "packageName": "@react-native-windows/codegen",
+  "email": "30809111+acoates-ms@users.noreply.github.com",
+  "dependentChangeType": "patch"
+}

packages/@react-native-windows/codegen/src/index.ts

@@ -109,7 +109,8 @@ function checkFilesForChanges(
     }
 
     const currentContents = fs.readFileSync(fileName, 'utf8');
-    if (currentContents !== contents) {
+    // The current file may be saved using crlf, in which case the new lines may differ from the new output
+    if (currentContents.replaceAll('\r\n', '\n') !== contents) {
       console.log(`- ${fileName} has changed`);
       hasChanges = true;
       continue;
@@ -146,7 +147,8 @@ function writeMapToFiles(map: Map<string, string>, outputDir: string) {
       if (fs.existsSync(fileName)) {
         const currentContents = fs.readFileSync(fileName, 'utf8');
         // Don't update the files if there are no changes as this breaks incremental builds
-        if (currentContents === contents) {
+        // The current file may be saved using crlf, in which case the new lines may differ from the new output
+        if (currentContents.replaceAll('\r\n', '\n') === contents) {
           continue;
         }
       }