biomejs · ematipico · Jan 23, 2026 · Jan 23, 2026 · Jan 23, 2026
diff --git a/.changeset/petite-mice-say.md b/.changeset/petite-mice-say.md
@@ -0,0 +1,5 @@
+---
+"@biomejs/biome": patch
+---
+
+Fixed [`#7912`](https://github.com/biomejs/biome/issues/7912), where Biome incorrectly added a leading newline to the code contained inside the Astro frontmatter.
diff --git a/.changeset/tricky-masks-cry.md b/.changeset/tricky-masks-cry.md
@@ -0,0 +1,5 @@
+---
+"@biomejs/biome": patch
+---
+
+Fixed a regression where formatting wasn't correctly applied when applying safe/unsafe fixes via the Biome linter.
diff --git a/crates/biome_cli/src/execute/process_file/lint_and_assist.rs b/crates/biome_cli/src/execute/process_file/lint_and_assist.rs
@@ -73,7 +73,7 @@ pub(crate) fn analyze_with_guard<'ctx>(
             .guard()
             .fix_file(
                 *fix_mode,
-                false,
+                features_supported.supports_format(),
                 categories,
                 only.clone(),
                 skip.clone(),

diff --git a/crates/biome_cli/tests/cases/handle_astro_files.rs b/crates/biome_cli/tests/cases/handle_astro_files.rs
@@ -748,3 +748,56 @@ fn does_not_throw_parse_error_for_return_full_support() {
         result,
     ));
 }
+
+#[test]
+fn issue_7912() {
+    let fs = MemoryFileSystem::default();
+    let mut console = BufferConsole::default();
+
+    fs.insert(
+        "biome.json".into(),
+        r#"{ "html": { "experimentalFullSupportEnabled": true, "formatter": { "enabled": true } } }"#.as_bytes(),
+    );
+
+    let astro_file_path = Utf8Path::new("file.astro");
+    fs.insert(
+        astro_file_path.into(),
+        r#"---
+            const title = "Hello World";
+---
+
+<html>
+  <head>
+            <title>{title}</title>
+  </head>
+  <body>
+            <h1>{title}</h1>
+  </body>
+</html>"#
+            .as_bytes(),
+    );
+
+    let (fs, result) = run_cli(
+        fs,
+        &mut console,
+        Args::from(
+            [
+                "lint",
+                "--write",
+                "--only=suspicious/noDebugger",
+                astro_file_path.as_str(),
+            ]
+            .as_slice(),
+        ),
+    );
+
+    assert!(result.is_ok(), "run_cli returned {result:?}");
+
+    assert_cli_snapshot(SnapshotPayload::new(
+        module_path!(),
+        "issue_7912",
+        fs,
+        console,
+        result,
+    ));
+}
diff --git a/crates/biome_cli/tests/cases/included_files.rs b/crates/biome_cli/tests/cases/included_files.rs
@@ -9,7 +9,7 @@ const UNFORMATTED: &str = "  statement(  )  ";
 const FORMATTED: &str = "statement();\n";
 
 const FIX_BEFORE: &str = "(1 >= -0)";
-const FIX_AFTER: &str = "(1 >= 0)";
+const FIX_AFTER: &str = "1 >= 0;\n";
 
 const UNORGANIZED: &str = r#"import * as something from "../something";
 import { lorem, foom, bar } from "foo";"#;

diff --git a/crates/biome_cli/tests/cases/overrides_linter.rs b/crates/biome_cli/tests/cases/overrides_linter.rs
@@ -6,13 +6,13 @@ use bpaf::Args;
 use camino::Utf8Path;
 
 const FIX_BEFORE: &str = "(1 >= -0)";
-const FIX_AFTER: &str = "(1 >= 0)";
+const FIX_AFTER: &str = "1 >= 0;\n";
 
-const DEBUGGER_BEFORE: &str = "debugger";
+const DEBUGGER_BEFORE: &str = "debugger;\n";
 const DEBUGGER_AFTER: &str = "";
 
 const SIMPLE_NUMBERS_BEFORE: &str = "({ 0x1: 1 });";
-const SIMPLE_NUMBERS_AFTER: &str = "({ 1: 1 });";
+const SIMPLE_NUMBERS_AFTER: &str = "({ 1: 1 });\n";
 
 #[test]
 fn does_handle_included_file_and_disable_linter() {

diff --git a/crates/biome_cli/tests/cases/suppressions.rs b/crates/biome_cli/tests/cases/suppressions.rs
@@ -5,12 +5,12 @@ use biome_fs::{FileSystemExt, MemoryFileSystem};
 use bpaf::Args;
 use camino::Utf8Path;
 
-const SUPPRESS_BEFORE: &str = "(1 >= -0)";
+const SUPPRESS_BEFORE: &str = "1 >= -0;\n";
 const SUPPRESS_AFTER: &str =
-    "// biome-ignore lint/suspicious/noCompareNegZero: ignored using `--suppress`\n(1 >= -0)";
+    "// biome-ignore lint/suspicious/noCompareNegZero: ignored using `--suppress`\n1 >= -0;\n";
 
 const SUPPRESS_WITH_REASON: &str =
-    "// biome-ignore lint/suspicious/noCompareNegZero: We love Biome\n(1 >= -0)";
+    "// biome-ignore lint/suspicious/noCompareNegZero: We love Biome\n1 >= -0;\n";
 
 #[test]
 fn ok() {

diff --git a/crates/biome_cli/tests/commands/lint.rs b/crates/biome_cli/tests/commands/lint.rs
@@ -38,7 +38,7 @@ const NO_DEBUGGER: &str = "debugger;";
 const NEW_SYMBOL: &str = "new Symbol(\"\");";
 
 const FIX_BEFORE: &str = "(1 >= -0)";
-const FIX_AFTER: &str = "(1 >= 0)";
+const FIX_AFTER: &str = "1 >= 0;\n";
 
 const APPLY_SUGGESTED_BEFORE: &str = "let a = 4;
 debugger;
@@ -306,7 +306,7 @@ function _f() { arguments; }
 
     let expected = "const a = 4;
 console.log(a);
-function _f() { arguments; }
+function _f() {\n\targuments;\n}
 ";
 
     let test1 = Utf8Path::new("test1.js");
@@ -516,7 +516,7 @@ fn should_disable_a_rule_group() {
         .read_to_string(&mut buffer)
         .unwrap();
 
-    assert_eq!(buffer, "(1 >= -0)");
+    assert_eq!(buffer, "1 >= -0;\n");
 
     assert_cli_snapshot(SnapshotPayload::new(
         module_path!(),
@@ -3593,7 +3593,7 @@ function _f() { arguments; }
 
     let expected = "const a = 4;
 console.log(a);
-function _f() { arguments; }
+function _f() {\n\targuments;\n}
 ";
     let test1 = Utf8Path::new("test1.js");
     fs.insert(test1.into(), source.as_bytes());

diff --git a/crates/biome_cli/tests/snapshots/main_cases_handle_astro_files/full_support.snap b/crates/biome_cli/tests/snapshots/main_cases_handle_astro_files/full_support.snap
@@ -57,15 +57,15 @@ check ━━━━━━━━━━━━━━━━━━━━━━━━
 # Emitted Messages
 
 ```block
-file.astro:16:20 lint/a11y/useGenericFontNames ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
+file.astro:17:15 lint/a11y/useGenericFontNames ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
 
   × Generic font family missing.
 
-    15 │ <style>
-  > 16 │ #id { font-family: comic-sans } .class { background: red}
-       │                    ^^^^^^^^^^
-    17 │ </style>
-    18 │ 
+    16 │ <style>#id {
+  > 17 │ 	font-family: comic-sans;
+       │ 	             ^^^^^^^^^^
+    18 │ }
+    19 │ .class {
 
   i Consider adding a generic font family as a fallback.
 

diff --git a/crates/biome_cli/tests/snapshots/main_cases_handle_astro_files/issue_7912.snap b/crates/biome_cli/tests/snapshots/main_cases_handle_astro_files/issue_7912.snap
@@ -0,0 +1,38 @@
+---
+source: crates/biome_cli/tests/snap_test.rs
+expression: redactor(content)
+---
+## `biome.json`
+
+```json
+{
+  "html": {
+    "experimentalFullSupportEnabled": true,
+    "formatter": { "enabled": true }
+  }
+}
+```
+
+## `file.astro`
+
+```astro
+---
+const title = "Hello World";
+---
+
+<html>
+	<head>
+		<title>{title}</title>
+	</head>
+	<body>
+		<h1>{title}</h1>
+	</body>
+</html>
+
+```
+
+# Emitted Messages
+
+```block
+Checked 1 file in <TIME>. Fixed 1 file.
+```
diff --git a/crates/biome_cli/tests/snapshots/main_cases_handle_svelte_files/full_support.snap b/crates/biome_cli/tests/snapshots/main_cases_handle_svelte_files/full_support.snap
@@ -57,15 +57,15 @@ check ━━━━━━━━━━━━━━━━━━━━━━━━
 # Emitted Messages
 
 ```block
-file.svelte:12:20 lint/a11y/useGenericFontNames ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
+file.svelte:16:15 lint/a11y/useGenericFontNames ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
 
   × Generic font family missing.
 
-    11 │ <style>
-  > 12 │ #id { font-family: comic-sans } .class { background: red}
-       │                    ^^^^^^^^^^
-    13 │ </style>
-    14 │ 
+    15 │ <style>#id {
+  > 16 │ 	font-family: comic-sans;
+       │ 	             ^^^^^^^^^^
+    17 │ }
+    18 │ .class {
 
   i Consider adding a generic font family as a fallback.
 

diff --git a/crates/biome_cli/tests/snapshots/main_cases_handle_svelte_files/full_support_ts.snap b/crates/biome_cli/tests/snapshots/main_cases_handle_svelte_files/full_support_ts.snap
@@ -62,15 +62,15 @@ check ━━━━━━━━━━━━━━━━━━━━━━━━
 # Emitted Messages
 
 ```block
-file.svelte:17:20 lint/a11y/useGenericFontNames ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
+file.svelte:21:15 lint/a11y/useGenericFontNames ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
 
   × Generic font family missing.
 
-    16 │ <style>
-  > 17 │ #id { font-family: comic-sans } .class { background: red}
-       │                    ^^^^^^^^^^
-    18 │ </style>
-    19 │ 
+    20 │ <style>#id {
+  > 21 │ 	font-family: comic-sans;
+       │ 	             ^^^^^^^^^^
+    22 │ }
+    23 │ .class {
 
   i Consider adding a generic font family as a fallback.
 

diff --git a/crates/biome_cli/tests/snapshots/main_cases_handle_vue_files/full_support.snap b/crates/biome_cli/tests/snapshots/main_cases_handle_vue_files/full_support.snap
@@ -57,15 +57,15 @@ check ━━━━━━━━━━━━━━━━━━━━━━━━
 # Emitted Messages
 
 ```block
-file.vue:12:20 lint/a11y/useGenericFontNames ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
+file.vue:16:15 lint/a11y/useGenericFontNames ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
 
   × Generic font family missing.
 
-    11 │ <style>
-  > 12 │ #id { font-family: comic-sans } .class { background: red}
-       │                    ^^^^^^^^^^
-    13 │ </style>
-    14 │ 
+    15 │ <style>#id {
+  > 16 │ 	font-family: comic-sans;
+       │ 	             ^^^^^^^^^^
+    17 │ }
+    18 │ .class {
 
   i Consider adding a generic font family as a fallback.
 

diff --git a/crates/biome_cli/tests/snapshots/main_cases_handle_vue_files/full_support_ts.snap b/crates/biome_cli/tests/snapshots/main_cases_handle_vue_files/full_support_ts.snap
@@ -62,15 +62,15 @@ check ━━━━━━━━━━━━━━━━━━━━━━━━
 # Emitted Messages
 
 ```block
-file.vue:17:20 lint/a11y/useGenericFontNames ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
+file.vue:21:15 lint/a11y/useGenericFontNames ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
 
   × Generic font family missing.
 
-    16 │ <style>
-  > 17 │ #id { font-family: comic-sans } .class { background: red}
-       │                    ^^^^^^^^^^
-    18 │ </style>
-    19 │ 
+    20 │ <style>#id {
+  > 21 │ 	font-family: comic-sans;
+       │ 	             ^^^^^^^^^^
+    22 │ }
+    23 │ .class {
 
   i Consider adding a generic font family as a fallback.
 

diff --git a/...s/biome_cli/tests/snapshots/main_cases_html/should_apply_fixes_to_embedded_languages.snap b/...s/biome_cli/tests/snapshots/main_cases_html/should_apply_fixes_to_embedded_languages.snap
@@ -52,21 +52,25 @@ check ━━━━━━━━━━━━━━━━━━━━━━━━
 # Emitted Messages
 
 ```block
-file.html:7:48 lint/suspicious/noDuplicateProperties ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
+file.html:7:2 lint/suspicious/noDuplicateProperties ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
 
   × Duplicate properties can lead to unexpected behavior and may override previous declarations unintentionally.
 
-    6 │         </script>
-  > 7 │ <style>#id .class div { background-color: red; background-color: red;  } </style>
-      │                                                ^^^^^^^^^^^^^^^^
-    8 │ 
+    5 │ <style>#id .class div {
+    6 │ 	background-color: red;
+  > 7 │ 	background-color: red;
+      │ 	^^^^^^^^^^^^^^^^
+    8 │ }
+    9 │ </style>
 
   i background-color is already defined here.
 
-    6 │         </script>
-  > 7 │ <style>#id .class div { background-color: red; background-color: red;  } </style>
-      │                         ^^^^^^^^^^^^^^^^
-    8 │ 
+    4 │ </script>
+    5 │ <style>#id .class div {
+  > 6 │ 	background-color: red;
+      │ 	^^^^^^^^^^^^^^^^
+    7 │ 	background-color: red;
+    8 │ }
 
   i Remove or rename the duplicate property to ensure consistent styling.
 

diff --git a/...n_cases_included_files/does_not_handle_included_files_if_overridden_by_ignore_linter.snap b/...n_cases_included_files/does_not_handle_included_files_if_overridden_by_ignore_linter.snap
@@ -1,7 +1,6 @@
 ---
 source: crates/biome_cli/tests/snap_test.rs
 expression: redactor(content)
-snapshot_kind: text
 ---
 ## `biome.json`
 
@@ -18,7 +17,8 @@ snapshot_kind: text
 ## `test2.js`
 
 ```js
-(1 >= 0)
+1 >= 0;
+
 ```
 
 # Emitted Messages

diff --git a/...s/snapshots/main_cases_overrides_linter/does_handle_included_file_and_disable_linter.snap b/...s/snapshots/main_cases_overrides_linter/does_handle_included_file_and_disable_linter.snap
@@ -1,7 +1,6 @@
 ---
 source: crates/biome_cli/tests/snap_test.rs
 expression: redactor(content)
-snapshot_kind: text
 ---
 ## `biome.json`
 
@@ -23,7 +22,8 @@ snapshot_kind: text
 ## `test.js`
 
 ```js
-(1 >= 0)
+1 >= 0;
+
 ```
 
 # Emitted Messages