biomejs · dyc3 · Dec 6, 2025 · Dec 5, 2025
diff --git a/.changeset/quiet-worms-sip.md b/.changeset/quiet-worms-sip.md
@@ -0,0 +1,5 @@
+---
+"@biomejs/biome": patch
+---
+
+Fixed [#8360](https://github.com/biomejs/biome/issues/8360): GritQL plugins defined in child configurations with `extends: "//"` now work correctly.
diff --git a/crates/biome_cli/tests/cases/monorepo.rs b/crates/biome_cli/tests/cases/monorepo.rs
@@ -676,3 +676,70 @@ fn should_ignore_linter_nested_file() {
         result,
     ));
 }
+
+#[test]
+fn plugins_in_child_config_with_extends_root() {
+    let mut fs = TemporaryFs::new("plugins_in_child_config_with_extends_root");
+
+    fs.create_file(
+        "biome.json",
+        r#"{
+    "linter": {
+        "enabled": true
+    }
+}"#,
+    );
+
+    fs.create_file(
+        "packages/mobile/biome.json",
+        r#"{
+    "extends": "//",
+    "plugins": ["./biome-plugins/no-object-assign.grit"],
+    "linter": {
+        "enabled": true,
+        "rules": {
+            "recommended": true
+        }
+    }
+}"#,
+    );
+
+    fs.create_file(
+        "packages/mobile/biome-plugins/no-object-assign.grit",
+        r#"`$fn($args)` where {
+    $fn <: `Object.assign`,
+    register_diagnostic(
+        span = $fn,
+        message = "Prefer object spread instead of Object.assign()",
+        severity = "warn"
+    )
+}"#,
+    );
+
+    fs.create_file(
+        "packages/mobile/src/file.js",
+        r#"const merged = Object.assign({}, a, b);
+"#,
+    );
+
+    let mut console = BufferConsole::default();
+    let result = run_cli_with_dyn_fs(
+        Box::new(fs.create_os()),
+        &mut console,
+        Args::from(
+            [
+                "lint",
+                &format!("{}/packages/mobile/src/file.js", fs.cli_path()),
+            ]
+            .as_slice(),
+        ),
+    );
+
+    assert_cli_snapshot(SnapshotPayload::new(
+        module_path!(),
+        "plugins_in_child_config_with_extends_root",
+        fs.create_mem(),
+        console,
+        result,
+    ));
+}
diff --git a/...me_cli/tests/snapshots/main_cases_monorepo/plugins_in_child_config_with_extends_root.snap b/...me_cli/tests/snapshots/main_cases_monorepo/plugins_in_child_config_with_extends_root.snap
@@ -0,0 +1,88 @@
+---
+source: crates/biome_cli/tests/snap_test.rs
+assertion_line: 432
+expression: redactor(content)
+---
+## `packages/mobile/biome.json`
+
+```json
+{
+  "extends": "//",
+  "plugins": ["./biome-plugins/no-object-assign.grit"],
+  "linter": {
+    "enabled": true,
+    "rules": {
+      "recommended": true
+    }
+  }
+}
+```
+
+## `biome.json`
+
+```json
+{
+  "linter": {
+    "enabled": true
+  }
+}
+```
+
+## `packages/mobile/biome-plugins/no-object-assign.grit`
+
+```grit
+`$fn($args)` where {
+    $fn <: `Object.assign`,
+    register_diagnostic(
+        span = $fn,
+        message = "Prefer object spread instead of Object.assign()",
+        severity = "warn"
+    )
+}
+```
+
+## `packages/mobile/src/file.js`
+
+```js
+const merged = Object.assign({}, a, b);
+
+```
+
+# Emitted Messages
+
+```block
+packages/mobile/src/file.js:1:16 plugin ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
+
+  ! Prefer object spread instead of Object.assign()
+
+  > 1 │ const merged = Object.assign({}, a, b);
+      │                ^^^^^^^^^^^^^
+    2 │ 
+
+
+```
+
+```block
+packages/mobile/src/file.js:1:7 lint/correctness/noUnusedVariables  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━
+
+  ! This variable merged is unused.
+
+  > 1 │ const merged = Object.assign({}, a, b);
+      │       ^^^^^^
+    2 │ 
+
+  i Unused variables are often the result of an incomplete refactoring, typos, or other sources of bugs.
+
+  i Unsafe fix: If this is intentional, prepend merged with an underscore.
+
+    1   │ - const·merged·=·Object.assign({},·a,·b);
+      1 │ + const·_merged·=·Object.assign({},·a,·b);
+    2 2 │   
+
+
+```
+
+```block
+Checked 1 file in <TIME>. No fixes applied.
+Found 2 warnings.
+```
diff --git a/crates/biome_service/src/workspace/server.rs b/crates/biome_service/src/workspace/server.rs
@@ -1006,7 +1006,6 @@ impl Workspace for WorkspaceServer {
         let mut diagnostics: Vec<biome_diagnostics::serde::Diagnostic> = vec![];
         let workspace_directory = workspace_directory.map(|p| p.to_path_buf());
         let is_root = configuration.is_root();
-        let extends_root = configuration.extends_root();
         let mut settings = if !is_root {
             if !self.projects.is_project_registered(project_key) {
                 return Err(WorkspaceError::no_project());
@@ -1034,14 +1033,8 @@ impl Workspace for WorkspaceServer {
                 .collect(),
         )?;
 
-        let loading_directory = if extends_root {
-            self.projects.get_project_path(project_key)
-        } else {
-            workspace_directory.clone()
-        };
-
         let plugin_diagnostics = self.load_plugins(
-            &loading_directory.clone().unwrap_or_default(),
+            &workspace_directory.clone().unwrap_or_default(),
             &settings.as_all_plugins(),
         );