fix(fmt): ignore file directive for YAML files (#26717)

Closes https://github.com/denoland/deno/issues/26712

Support `# deno-fmt-ignore-file` directive for YAML files.

Also added tests for single line ignores.

1 files changed, 15 insertions, 0 deletions

diff --git a/cli/tools/fmt.rs b/cli/tools/fmt.rs
index 81af25c34..837883561 100644
--- a/cli/tools/fmt.rs
+++ b/cli/tools/fmt.rs
@@ -353,6 +353,21 @@ fn format_yaml(
   file_text: &str,
   fmt_options: &FmtOptionsConfig,
 ) -> Result<Option<String>, AnyError> {
+  let ignore_file = file_text
+    .lines()
+    .take_while(|line| line.starts_with('#'))
+    .any(|line| {
+      line
+        .strip_prefix('#')
+        .unwrap()
+        .trim()
+        .starts_with("deno-fmt-ignore-file")
+    });
+
+  if ignore_file {
+    return Ok(None);
+  }
+
   let formatted_str =
     pretty_yaml::format_text(file_text, &get_resolved_yaml_config(fmt_options))
       .map_err(AnyError::from)?;