From 2c7c44bd3f5f995212536f7775ca1677535faab1 Mon Sep 17 00:00:00 2001
From: hello <cedric@ninja-squad.com>
Date: Thu, 26 Feb 2026 08:33:40 +0100
Subject: [PATCH] fix(@angular/cli): ignore unknown files when formatting
 schematic changes

When schematics modify files such as .gitignore, Prettier cannot infer a parser and formatting fails.

```
npx prettier --check .gitignore
[error] No parser could be inferred for file ".gitignore".
```

With ignore-unknown enabled, Prettier does not throw this parser error
---
 packages/angular/cli/src/utilities/prettier.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/angular/cli/src/utilities/prettier.ts b/packages/angular/cli/src/utilities/prettier.ts
index e481d94a8b89..e2e516b82367 100644
--- a/packages/angular/cli/src/utilities/prettier.ts
+++ b/packages/angular/cli/src/utilities/prettier.ts
@@ -44,7 +44,7 @@ export async function formatFiles(cwd: string, files: Set<string>): Promise<void
 
   await execFileAsync(
     process.execPath,
-    [prettierCliPath, '--write', '--no-error-on-unmatched-pattern', ...files],
+    [prettierCliPath, '--write', '--no-error-on-unmatched-pattern', '--ignore-unknown', ...files],
     {
       cwd,
       shell: false,