fix(devkit): formatFiles should work when writing initial prettierrc …

…in generator (#16711)

packages/devkit/src/generators/format-files.ts

@@ -25,6 +25,8 @@ export async function formatFiles(tree: Tree): Promise<void> {
     tree.listChanges().filter((file) => file.type !== 'DELETE')
   );
 
+  const changedPrettierInTree = getChangedPrettierConfigInTree(tree);
+
   await Promise.all(
     Array.from(files).map(async (file) => {
       const systemPath = path.join(tree.root, file.path);
@@ -33,22 +35,17 @@ export async function formatFiles(tree: Tree): Promise<void> {
         editorconfig: true,
       });
 
-      let optionsFromTree;
-      if (!resolvedOptions) {
-        try {
-          optionsFromTree = readJson(tree, '.prettierrc');
-        } catch {}
-      }
-      const options: any = {
+      const options: Prettier.Options = {
+        ...resolvedOptions,
+        ...changedPrettierInTree,
         filepath: systemPath,
-        ...(resolvedOptions ?? optionsFromTree),
       };
 
       if (file.path.endsWith('.swcrc')) {
         options.parser = 'json';
       }
 
-      const support = await prettier.getFileInfo(systemPath, options);
+      const support = await prettier.getFileInfo(systemPath, options as any);
       if (support.ignored || !support.inferredParser) {
         return;
       }
@@ -92,3 +89,15 @@ function getRootTsConfigPath(tree: Tree): string | null {
 
   return null;
 }
+
+function getChangedPrettierConfigInTree(tree: Tree): Prettier.Options | null {
+  if (tree.listChanges().find((file) => file.path === '.prettierrc')) {
+    try {
+      return readJson(tree, '.prettierrc');
+    } catch {
+      return null;
+    }
+  } else {
+    return null;
+  }
+}