diff --git a/crates/tinymist-query/src/analysis.rs b/crates/tinymist-query/src/analysis.rs
index 9e8cabc4f..9c04007a2 100644
--- a/crates/tinymist-query/src/analysis.rs
+++ b/crates/tinymist-query/src/analysis.rs
@@ -629,7 +629,11 @@ mod call_info_tests {
 mod lint_tests {
     use std::collections::BTreeMap;
 
-    use tinymist_lint::KnownIssues;
+    use tinymist_analysis::{
+        adt::interner::Interned,
+        syntax::{Decl, Expr},
+    };
+    use tinymist_lint::{DeadCodeConfig, KnownIssues};
 
     use crate::tests::*;
 
@@ -662,4 +666,54 @@ mod lint_tests {
             assert_snapshot!(JsonRepr::new_redacted(result, &REDACT_LOC));
         });
     }
+
+    #[test]
+    fn test_dead_code_exported() {
+        snapshot_testing("dead_code_exported", &|ctx, path| {
+            let source = ctx.source_by_path(&path).unwrap();
+            let ei = ctx.expr_stage(&source);
+            let ti = ctx.type_check(&source);
+
+            let has_references = |decl: &Interned<Decl>| -> bool {
+                if matches!(decl.as_ref(), Decl::PathStem(_)) {
+                    if ei.resolves.values().any(|r| {
+                        matches!(
+                            r.step.as_ref(),
+                            Some(Expr::Decl(step_decl)) if step_decl == decl
+                        )
+                    }) {
+                        return true;
+                    }
+                } else if ei
+                    .get_refs(decl.clone())
+                    .any(|(_, r)| r.as_ref().decl != *decl)
+                {
+                    return true;
+                }
+
+                false
+            };
+
+            let dead_code_config = DeadCodeConfig {
+                check_exported: true,
+                ..DeadCodeConfig::default()
+            };
+            let result = tinymist_lint::lint_file_with_dead_code_config(
+                ctx.world(),
+                &ei,
+                ti,
+                KnownIssues::default(),
+                has_references,
+                &dead_code_config,
+            )
+            .diagnostics;
+
+            let result = crate::diagnostics::DiagWorker::new(ctx).convert_all(result.iter());
+            let result = result
+                .into_iter()
+                .map(|(k, v)| (file_uri_(&k), v))
+                .collect::<BTreeMap<_, _>>();
+            assert_snapshot!(JsonRepr::new_redacted(result, &REDACT_LOC));
+        });
+    }
 }
diff --git a/crates/tinymist-query/src/analysis/code_action.rs b/crates/tinymist-query/src/analysis/code_action.rs
index d538eec76..35c018728 100644
--- a/crates/tinymist-query/src/analysis/code_action.rs
+++ b/crates/tinymist-query/src/analysis/code_action.rs
@@ -15,6 +15,13 @@ use crate::analysis::LinkTarget;
 use crate::prelude::*;
 use crate::syntax::{InterpretMode, interpret_mode_at};
 
+const UNUSED_CODE_IMPORTED_ITEM: &str = "tinymist.unused.import";
+const UNUSED_CODE_MODULE_IMPORT: &str = "tinymist.unused.module_import";
+const UNUSED_CODE_MODULE: &str = "tinymist.unused.module";
+const UNUSED_CODE_SYMBOL: &str = "tinymist.unused.symbol";
+const UNUSED_CODE_EXPORTED_DOCUMENTED_FUNCTION: &str =
+    "tinymist.unused.exported_documented_function";
+
 /// Analyzes the document and provides code actions.
 pub struct CodeActionWorker<'a> {
     /// The local analysis context to work with.
@@ -75,11 +82,32 @@ impl<'a> CodeActionWorker<'a> {
         }
 
         for diag in &context.diagnostics {
-            let Some(source) = diag.source.as_deref() else {
+            let Some(diag_range) = self.ctx.to_typst_range(diag.range, &self.source) else {
                 continue;
             };
 
-            let Some(diag_range) = self.ctx.to_typst_range(diag.range, &self.source) else {
+            if let Some(unused_code) = unused_code(diag) {
+                if unused_code == UNUSED_CODE_IMPORTED_ITEM {
+                    self.autofix_remove_unused_import(root, &diag_range);
+                } else if unused_code == UNUSED_CODE_MODULE_IMPORT
+                    || unused_code == UNUSED_CODE_MODULE
+                {
+                    self.autofix_remove_declaration(root, &diag_range);
+                } else {
+                    let Some(binding_range) = self.binding_range_for_diag(root, &diag_range, diag)
+                    else {
+                        continue;
+                    };
+
+                    self.autofix_unused_symbol(&binding_range);
+                    self.autofix_replace_with_placeholder(root, &binding_range);
+                    self.autofix_remove_declaration(root, &binding_range);
+                }
+
+                continue;
+            }
+
+            let Some(source) = diag.source.as_deref() else {
                 continue;
             };
 
@@ -90,23 +118,6 @@ impl<'a> CodeActionWorker<'a> {
                 Some(AutofixKind::FileNotFound) => {
                     self.autofix_file_not_found(root, &diag_range);
                 }
-                Some(AutofixKind::MarkUnusedSymbol) => {
-                    if diag.message.starts_with("unused import:") {
-                        self.autofix_remove_unused_import(root, &diag_range);
-                    } else if diag.message.starts_with("unused module") {
-                        self.autofix_remove_declaration(root, &diag_range);
-                    } else {
-                        let Some(binding_range) =
-                            self.binding_range_for_diag(root, &diag_range, diag)
-                        else {
-                            continue;
-                        };
-
-                        self.autofix_unused_symbol(&binding_range);
-                        self.autofix_replace_with_placeholder(root, &binding_range);
-                        self.autofix_remove_declaration(root, &binding_range);
-                    }
-                }
                 _ => {}
             }
         }
@@ -521,33 +532,12 @@ impl<'a> CodeActionWorker<'a> {
         diag_range: &Range<usize>,
         diag: &lsp_types::Diagnostic,
     ) -> Option<Range<usize>> {
+        let _ = (root, diag);
         if diag_range.is_empty() {
             return None;
         }
 
-        if let Some(text) = self.source.text().get(diag_range.clone()) {
-            if is_plain_identifier(text) {
-                return Some(diag_range.clone());
-            }
-        }
-
-        let name = extract_backticked_name(&diag.message)?;
-        let cursor = (diag_range.start + 1).min(self.source.text().len());
-        let node = root.leaf_at_compat(cursor)?;
-        let decl_node = self.find_declaration_ancestor(&node)?;
-
-        if decl_node.kind() == SyntaxKind::LetBinding {
-            let let_binding = decl_node.cast::<ast::LetBinding>()?;
-            for binding in let_binding.kind().bindings() {
-                let binding_node = decl_node.find(binding.span())?;
-                let range = binding_node.range();
-                if self.source.text().get(range.clone())? == name {
-                    return Some(range);
-                }
-            }
-        }
-
-        None
+        Some(diag_range.clone())
     }
 
     fn expand_import_item_range(&self, mut range: Range<usize>) -> Range<usize> {
@@ -1013,14 +1003,9 @@ impl<'a> CodeActionWorker<'a> {
 enum AutofixKind {
     UnknownVariable,
     FileNotFound,
-    MarkUnusedSymbol,
 }
 
 fn match_autofix_kind(source: &str, msg: &str) -> Option<AutofixKind> {
-    if msg.starts_with("unused ") {
-        return Some(AutofixKind::MarkUnusedSymbol);
-    }
-
     if source == "typst" {
         static PATTERNS: &[(&str, AutofixKind)] = &[
             ("unknown variable", AutofixKind::UnknownVariable),
@@ -1037,15 +1022,8 @@ fn match_autofix_kind(source: &str, msg: &str) -> Option<AutofixKind> {
     None
 }
 
-fn extract_backticked_name(message: &str) -> Option<&str> {
-    let start = message.find('`')?;
-    let rest = &message[start + 1..];
-    let end = rest.find('`')?;
-    Some(&rest[..end])
-}
-
 fn is_ascii_ident(ch: u8) -> bool {
-    matches!(ch, b'_' | b'a'..=b'z' | b'A'..=b'Z' | b'0'..=b'9')
+    matches!(ch, b'_' | b'-' | b'a'..=b'z' | b'A'..=b'Z' | b'0'..=b'9')
 }
 
 fn is_plain_identifier(name: &str) -> bool {
@@ -1060,3 +1038,17 @@ fn is_plain_identifier(name: &str) -> bool {
 
     chars.all(|ch| ch == '_' || ch.is_ascii_alphanumeric())
 }
+
+fn unused_code(diag: &lsp_types::Diagnostic) -> Option<&str> {
+    match diag.code.as_ref()? {
+        lsp_types::NumberOrString::String(s) => match s.as_str() {
+            UNUSED_CODE_IMPORTED_ITEM
+            | UNUSED_CODE_MODULE_IMPORT
+            | UNUSED_CODE_MODULE
+            | UNUSED_CODE_SYMBOL
+            | UNUSED_CODE_EXPORTED_DOCUMENTED_FUNCTION => Some(s.as_str()),
+            _ => None,
+        },
+        _ => None,
+    }
+}
diff --git a/crates/tinymist-query/src/diagnostics.rs b/crates/tinymist-query/src/diagnostics.rs
index b7b875926..e99c6a7c7 100644
--- a/crates/tinymist-query/src/diagnostics.rs
+++ b/crates/tinymist-query/src/diagnostics.rs
@@ -1,6 +1,6 @@
 use std::borrow::Cow;
 
-use tinymist_lint::KnownIssues;
+use tinymist_lint::{DOCUMENTED_EXPORTED_FUNCTION_HINT, KnownIssues};
 use tinymist_world::vfs::WorkspaceResolver;
 use typst::syntax::Span;
 
@@ -14,6 +14,13 @@ pub type DiagnosticsMap = HashMap<Url, EcoVec<Diagnostic>>;
 type TypstDiagnostic = typst::diag::SourceDiagnostic;
 type TypstSeverity = typst::diag::Severity;
 
+const UNUSED_CODE_IMPORTED_ITEM: &str = "tinymist.unused.import";
+const UNUSED_CODE_MODULE_IMPORT: &str = "tinymist.unused.module_import";
+const UNUSED_CODE_MODULE: &str = "tinymist.unused.module";
+const UNUSED_CODE_SYMBOL: &str = "tinymist.unused.symbol";
+const UNUSED_CODE_EXPORTED_DOCUMENTED_FUNCTION: &str =
+    "tinymist.unused.exported_documented_function";
+
 /// Converts a list of Typst diagnostics to LSP diagnostics,
 /// with potential refinements on the error messages.
 pub fn convert_diagnostics<'a>(
@@ -122,13 +129,20 @@ impl<'w> DiagWorker<'w> {
         let lsp_severity = diagnostic_severity(&typst_diagnostic);
         let lsp_message = diagnostic_message(&typst_diagnostic);
         let is_unused = typst_diagnostic.message.starts_with("unused ");
+        let unused_code = is_unused
+            .then(|| self.unused_code(&typst_diagnostic))
+            .flatten();
+        let is_documented_exported_function =
+            unused_code.is_some_and(|code| code == UNUSED_CODE_EXPORTED_DOCUMENTED_FUNCTION);
 
         let diagnostic = Diagnostic {
             range: lsp_range,
             severity: Some(lsp_severity),
             message: lsp_message,
             source: Some(self.source.to_owned()),
-            tags: is_unused.then(|| vec![DiagnosticTag::UNNECESSARY]),
+            code: unused_code.map(|code| lsp_types::NumberOrString::String(code.to_string())),
+            tags: (is_unused && !is_documented_exported_function)
+                .then(|| vec![DiagnosticTag::UNNECESSARY]),
             related_information: (!typst_diagnostic.trace.is_empty()).then(|| {
                 typst_diagnostic
                     .trace
@@ -182,6 +196,31 @@ impl<'w> DiagWorker<'w> {
             None => LspRange::new(LspPosition::new(0, 0), LspPosition::new(0, 0)),
         }
     }
+
+    fn unused_code(&self, diag: &TypstDiagnostic) -> Option<&'static str> {
+        let msg = diag.message.as_str();
+        if msg.starts_with("unused import:") {
+            return Some(UNUSED_CODE_IMPORTED_ITEM);
+        }
+        if msg.starts_with("unused module import") {
+            return Some(UNUSED_CODE_MODULE_IMPORT);
+        }
+        if msg.starts_with("unused module:") {
+            return Some(UNUSED_CODE_MODULE);
+        }
+        if msg.starts_with("unused function:")
+            && diag
+                .hints
+                .iter()
+                .any(|hint| hint.as_str() == DOCUMENTED_EXPORTED_FUNCTION_HINT)
+        {
+            return Some(UNUSED_CODE_EXPORTED_DOCUMENTED_FUNCTION);
+        }
+        if msg.starts_with("unused ") {
+            return Some(UNUSED_CODE_SYMBOL);
+        }
+        None
+    }
 }
 
 fn diagnostic_severity(typst_diagnostic: &TypstDiagnostic) -> DiagnosticSeverity {
diff --git a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@array_dict_usage.typ.snap b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@array_dict_usage.typ.snap
index 963f0ee84..283c1742e 100644
--- a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@array_dict_usage.typ.snap
+++ b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@array_dict_usage.typ.snap
@@ -6,8 +6,9 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/array_dict_usage.typ
 {
  "s0.typ": [
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused variable: `unused`\nHint: consider removing this variable or prefixing with underscore: `_unused`",
-   "range": "3:1:3:15",
+   "range": "3:5:3:11",
    "severity": 4,
    "source": "typst",
    "tags": [
diff --git a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@closure_capture.typ.snap b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@closure_capture.typ.snap
index 9cb2c9bc8..cf13da9ef 100644
--- a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@closure_capture.typ.snap
+++ b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@closure_capture.typ.snap
@@ -6,8 +6,9 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/closure_capture.typ
 {
  "s0.typ": [
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused variable: `unused_not_captured`\nHint: consider removing this variable or prefixing with underscore: `_unused_not_captured`",
-   "range": "2:1:2:30",
+   "range": "2:5:2:24",
    "severity": 4,
    "source": "typst",
    "tags": [
diff --git a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@conditional_usage.typ.snap b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@conditional_usage.typ.snap
index c85ef7d9e..cde9d8adf 100644
--- a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@conditional_usage.typ.snap
+++ b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@conditional_usage.typ.snap
@@ -6,8 +6,9 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/conditional_usage.typ
 {
  "s0.typ": [
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused variable: `unused`\nHint: consider removing this variable or prefixing with underscore: `_unused`",
-   "range": "4:1:4:16",
+   "range": "4:5:4:11",
    "severity": 4,
    "source": "typst",
    "tags": [
diff --git a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@contextual_usage.typ.snap b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@contextual_usage.typ.snap
index dac6a637f..fd3c4c81c 100644
--- a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@contextual_usage.typ.snap
+++ b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@contextual_usage.typ.snap
@@ -6,8 +6,9 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/contextual_usage.typ
 {
  "s0.typ": [
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused variable: `unused_ctx`\nHint: consider removing this variable or prefixing with underscore: `_unused_ctx`",
-   "range": "2:1:2:20",
+   "range": "2:5:2:15",
    "severity": 4,
    "source": "typst",
    "tags": [
diff --git a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@destructuring_array.typ.snap b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@destructuring_array.typ.snap
index 63f508539..31e3e9461 100644
--- a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@destructuring_array.typ.snap
+++ b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@destructuring_array.typ.snap
@@ -6,8 +6,9 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/destructuring_array.typ
 {
  "s0.typ": [
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused variable: `unused_x`\nHint: consider removing this variable or prefixing with underscore: `_unused_x`",
-   "range": "6:1:6:46",
+   "range": "6:15:6:23",
    "severity": 4,
    "source": "typst",
    "tags": [
@@ -15,8 +16,9 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/destructuring_array.typ
    ]
   },
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused variable: `c2`\nHint: consider removing this variable or prefixing with underscore: `_c2`",
-   "range": "6:1:6:46",
+   "range": "6:31:6:33",
    "severity": 4,
    "source": "typst",
    "tags": [
diff --git a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@destructuring_dict.typ.snap b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@destructuring_dict.typ.snap
index aa09054b9..34d64d0e4 100644
--- a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@destructuring_dict.typ.snap
+++ b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@destructuring_dict.typ.snap
@@ -6,8 +6,9 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/destructuring_dict.typ
 {
  "s0.typ": [
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused variable: `unused_x`\nHint: consider removing this variable or prefixing with underscore: `_unused_x`",
-   "range": "6:1:6:52",
+   "range": "6:18:6:26",
    "severity": 4,
    "source": "typst",
    "tags": [
@@ -15,8 +16,9 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/destructuring_dict.typ
    ]
   },
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused variable: `c2`\nHint: consider removing this variable or prefixing with underscore: `_c2`",
-   "range": "6:1:6:52",
+   "range": "6:37:6:39",
    "severity": 4,
    "source": "typst",
    "tags": [
diff --git a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@destructuring_spread.typ.snap b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@destructuring_spread.typ.snap
index 94c542a1c..cf092c689 100644
--- a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@destructuring_spread.typ.snap
+++ b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@destructuring_spread.typ.snap
@@ -6,8 +6,9 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/destructuring_spread.ty
 {
  "s0.typ": [
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused variable: `unused_rest`\nHint: consider removing this variable or prefixing with underscore: `_unused_rest`",
-   "range": "4:1:4:30",
+   "range": "4:11:4:22",
    "severity": 4,
    "source": "typst",
    "tags": [
diff --git a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@duplicate_module_alias_unused.typ.snap b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@duplicate_module_alias_unused.typ.snap
index d590ef4ed..ce2457a7f 100644
--- a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@duplicate_module_alias_unused.typ.snap
+++ b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@duplicate_module_alias_unused.typ.snap
@@ -6,6 +6,7 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/duplicate_module_alias_
 {
  "main.typ": [
   {
+   "code": "tinymist.unused.import",
    "message": "unused import: `b`\nHint: consider removing this unused import",
    "range": "3:19:3:20",
    "severity": 4,
diff --git a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@duplicate_module_alias_wildcard_unused.typ.snap b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@duplicate_module_alias_wildcard_unused.typ.snap
index 921efa34d..144a058ae 100644
--- a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@duplicate_module_alias_wildcard_unused.typ.snap
+++ b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@duplicate_module_alias_wildcard_unused.typ.snap
@@ -6,6 +6,7 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/duplicate_module_alias_
 {
  "main.typ": [
   {
+   "code": "tinymist.unused.import",
    "message": "unused import: `b`\nHint: consider removing this unused import",
    "range": "3:19:3:20",
    "severity": 4,
diff --git a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@duplicate_module_wildcard_unused.typ.snap b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@duplicate_module_wildcard_unused.typ.snap
index 1ef3906c4..44113f5e8 100644
--- a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@duplicate_module_wildcard_unused.typ.snap
+++ b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@duplicate_module_wildcard_unused.typ.snap
@@ -6,6 +6,7 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/duplicate_module_wildca
 {
  "main.typ": [
   {
+   "code": "tinymist.unused.module_import",
    "message": "unused module import\nHint: imported modules should be used or the import should be removed",
    "range": "3:1:3:18",
    "severity": 4,
diff --git a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@function_as_value.typ.snap b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@function_as_value.typ.snap
index cfff5de8c..80f5c5083 100644
--- a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@function_as_value.typ.snap
+++ b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@function_as_value.typ.snap
@@ -6,6 +6,7 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/function_as_value.typ
 {
  "s0.typ": [
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused function: `unused_callback`\nHint: consider removing this function or prefixing with underscore: `_unused_callback`",
    "range": "6:5:6:20",
    "severity": 4,
diff --git a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@import_module_alias_unused.typ.snap b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@import_module_alias_unused.typ.snap
index 3abaf867b..c333bbc66 100644
--- a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@import_module_alias_unused.typ.snap
+++ b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@import_module_alias_unused.typ.snap
@@ -6,6 +6,7 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/import_module_alias_unu
 {
  "main.typ": [
   {
+   "code": "tinymist.unused.import",
    "message": "unused import: `util`\nHint: consider removing this unused import",
    "range": "2:19:2:23",
    "severity": 4,
diff --git a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@import_module_unused.typ.snap b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@import_module_unused.typ.snap
index 5b0b8909c..edc9d2ab3 100644
--- a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@import_module_unused.typ.snap
+++ b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@import_module_unused.typ.snap
@@ -6,6 +6,7 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/import_module_unused.ty
 {
  "main.typ": [
   {
+   "code": "tinymist.unused.module",
    "message": "unused module: `u`\nHint: imported modules should be used or the import should be removed",
    "range": "2:8:2:15",
    "severity": 4,
diff --git a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@imported_unused.typ.snap b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@imported_unused.typ.snap
index dc784bcff..e2866010b 100644
--- a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@imported_unused.typ.snap
+++ b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@imported_unused.typ.snap
@@ -6,6 +6,7 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/imported_unused.typ
 {
  "main.typ": [
   {
+   "code": "tinymist.unused.import",
    "message": "unused import: `Bbar`\nHint: consider removing this unused import",
    "range": "2:24:2:28",
    "severity": 4,
@@ -15,6 +16,7 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/imported_unused.typ
    ]
   },
   {
+   "code": "tinymist.unused.import",
    "message": "unused import: `foo`\nHint: consider removing this unused import",
    "range": "2:30:2:33",
    "severity": 4,
@@ -24,6 +26,7 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/imported_unused.typ
    ]
   },
   {
+   "code": "tinymist.unused.module_import",
    "message": "unused module import\nHint: imported modules should be used or the import should be removed",
    "range": "2:1:2:33",
    "severity": 4,
diff --git a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@imported_used.typ.snap b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@imported_used.typ.snap
index 074ab38b0..04e3ba785 100644
--- a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@imported_used.typ.snap
+++ b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@imported_used.typ.snap
@@ -6,6 +6,7 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/imported_used.typ
 {
  "main.typ": [
   {
+   "code": "tinymist.unused.import",
    "message": "unused import: `foo`\nHint: consider removing this unused import",
    "range": "2:31:2:34",
    "severity": 4,
diff --git a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@loop_variables.typ.snap b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@loop_variables.typ.snap
index 3e4e40068..3697af109 100644
--- a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@loop_variables.typ.snap
+++ b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@loop_variables.typ.snap
@@ -6,6 +6,7 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/loop_variables.typ
 {
  "s0.typ": [
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused variable: `unused_item`\nHint: consider removing this variable or prefixing with underscore: `_unused_item`",
    "range": "1:5:1:16",
    "severity": 4,
diff --git a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@method_chain.typ.snap b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@method_chain.typ.snap
index c4b419bdf..d127cf3e5 100644
--- a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@method_chain.typ.snap
+++ b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@method_chain.typ.snap
@@ -6,8 +6,9 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/method_chain.typ
 {
  "s0.typ": [
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused variable: `unused_obj`\nHint: consider removing this variable or prefixing with underscore: `_unused_obj`",
-   "range": "8:1:8:24",
+   "range": "8:5:8:15",
    "severity": 4,
    "source": "typst",
    "tags": [
diff --git a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@module_item_wildcard_unused.typ.snap b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@module_item_wildcard_unused.typ.snap
index b24e5dee6..2e66afd30 100644
--- a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@module_item_wildcard_unused.typ.snap
+++ b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@module_item_wildcard_unused.typ.snap
@@ -6,6 +6,7 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/module_item_wildcard_un
 {
  "main.typ": [
   {
+   "code": "tinymist.unused.module_import",
    "message": "unused module import\nHint: imported modules should be used or the import should be removed",
    "range": "2:1:2:18",
    "severity": 4,
diff --git a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@multiple_unused.typ.snap b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@multiple_unused.typ.snap
index 77aa84a90..1c66995b0 100644
--- a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@multiple_unused.typ.snap
+++ b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@multiple_unused.typ.snap
@@ -6,8 +6,9 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/multiple_unused.typ
 {
  "s0.typ": [
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused variable: `unused1`\nHint: consider removing this variable or prefixing with underscore: `_unused1`",
-   "range": "1:1:1:16",
+   "range": "1:5:1:12",
    "severity": 4,
    "source": "typst",
    "tags": [
@@ -15,8 +16,9 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/multiple_unused.typ
    ]
   },
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused variable: `unused2`\nHint: consider removing this variable or prefixing with underscore: `_unused2`",
-   "range": "2:1:2:16",
+   "range": "2:5:2:12",
    "severity": 4,
    "source": "typst",
    "tags": [
@@ -24,8 +26,9 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/multiple_unused.typ
    ]
   },
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused variable: `unused3`\nHint: consider removing this variable or prefixing with underscore: `_unused3`",
-   "range": "4:1:4:16",
+   "range": "4:5:4:12",
    "severity": 4,
    "source": "typst",
    "tags": [
@@ -33,6 +36,7 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/multiple_unused.typ
    ]
   },
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused function: `unused_func1`\nHint: consider removing this function or prefixing with underscore: `_unused_func1`",
    "range": "6:5:6:17",
    "severity": 4,
@@ -42,6 +46,7 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/multiple_unused.typ
    ]
   },
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused function: `unused_func2`\nHint: consider removing this function or prefixing with underscore: `_unused_func2`",
    "range": "8:5:8:17",
    "severity": 4,
diff --git a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@nested_scope.typ.snap b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@nested_scope.typ.snap
index d70dc212e..e053c6aec 100644
--- a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@nested_scope.typ.snap
+++ b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@nested_scope.typ.snap
@@ -6,8 +6,9 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/nested_scope.typ
 {
  "s0.typ": [
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused variable: `inner_unused`\nHint: consider removing this variable or prefixing with underscore: `_inner_unused`",
-   "range": "4:2:4:22",
+   "range": "4:6:4:18",
    "severity": 4,
    "source": "typst",
    "tags": [
diff --git a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@pattern_destructure.typ.snap b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@pattern_destructure.typ.snap
index 81e3b0a99..b46699054 100644
--- a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@pattern_destructure.typ.snap
+++ b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@pattern_destructure.typ.snap
@@ -6,8 +6,9 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/pattern_destructure.typ
 {
  "s0.typ": [
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused variable: `unused_b`\nHint: consider removing this variable or prefixing with underscore: `_unused_b`",
-   "range": "1:1:1:43",
+   "range": "1:14:1:22",
    "severity": 4,
    "source": "typst",
    "tags": [
diff --git a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@shadowing.typ.snap b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@shadowing.typ.snap
index 8c43aedcc..f342a9efb 100644
--- a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@shadowing.typ.snap
+++ b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@shadowing.typ.snap
@@ -6,8 +6,9 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/shadowing.typ
 {
  "s0.typ": [
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused variable: `x`\nHint: consider removing this variable or prefixing with underscore: `_x`",
-   "range": "1:1:1:10",
+   "range": "1:5:1:6",
    "severity": 4,
    "source": "typst",
    "tags": [
diff --git a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@show_set_rules.typ.snap b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@show_set_rules.typ.snap
index ffdaa27cf..4e809edac 100644
--- a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@show_set_rules.typ.snap
+++ b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@show_set_rules.typ.snap
@@ -6,8 +6,9 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/show_set_rules.typ
 {
  "s0.typ": [
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused variable: `unused_style`\nHint: consider removing this variable or prefixing with underscore: `_unused_style`",
-   "range": "1:1:1:23",
+   "range": "1:5:1:17",
    "severity": 4,
    "source": "typst",
    "tags": [
diff --git a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@underscore_prefix.typ.snap b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@underscore_prefix.typ.snap
index 07c9cbf94..f638f9a60 100644
--- a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@underscore_prefix.typ.snap
+++ b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@underscore_prefix.typ.snap
@@ -6,8 +6,9 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/underscore_prefix.typ
 {
  "s0.typ": [
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused variable: `normal_unused`\nHint: consider removing this variable or prefixing with underscore: `_normal_unused`",
-   "range": "4:1:4:24",
+   "range": "4:5:4:18",
    "severity": 4,
    "source": "typst",
    "tags": [
diff --git a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@unused_function.typ.snap b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@unused_function.typ.snap
index dabe45b11..cd65c4031 100644
--- a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@unused_function.typ.snap
+++ b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@unused_function.typ.snap
@@ -6,6 +6,7 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/unused_function.typ
 {
  "s0.typ": [
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused function: `unused_func`\nHint: consider removing this function or prefixing with underscore: `_unused_func`",
    "range": "1:5:1:16",
    "severity": 4,
diff --git a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@unused_parameter.typ.snap b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@unused_parameter.typ.snap
index b44b97295..f43322cbd 100644
--- a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@unused_parameter.typ.snap
+++ b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@unused_parameter.typ.snap
@@ -6,6 +6,7 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/unused_parameter.typ
 {
  "s0.typ": [
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused variable: `unused_param`\nHint: if this parameter is intentionally unused, prefix it with underscore: `_unused_param`",
    "range": "1:22:1:34",
    "severity": 4,
diff --git a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@unused_variable.typ.snap b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@unused_variable.typ.snap
index edc73e355..10538e0c3 100644
--- a/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@unused_variable.typ.snap
+++ b/crates/tinymist-query/src/fixtures/dead_code/snaps/dead_code@unused_variable.typ.snap
@@ -6,8 +6,9 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/unused_variable.typ
 {
  "s0.typ": [
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused variable: `unused_var`\nHint: consider removing this variable or prefixing with underscore: `_unused_var`",
-   "range": "1:1:1:20",
+   "range": "1:5:1:15",
    "severity": 4,
    "source": "typst",
    "tags": [
diff --git a/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@array_dict_usage.typ.snap b/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@array_dict_usage.typ.snap
index 7dafe9a79..817fd3bf7 100644
--- a/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@array_dict_usage.typ.snap
+++ b/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@array_dict_usage.typ.snap
@@ -54,6 +54,6 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/array_dict_usage.typ
    }
   ],
   "message": "unused variable: `unused`\nHint: consider removing this variable or prefixing with underscore: `_unused`",
-  "range": "3:1:3:15"
+  "range": "3:5:3:11"
  }
 ]
diff --git a/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@closure_capture.typ.snap b/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@closure_capture.typ.snap
index 49505986a..cc3811d8a 100644
--- a/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@closure_capture.typ.snap
+++ b/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@closure_capture.typ.snap
@@ -54,6 +54,6 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/closure_capture.typ
    }
   ],
   "message": "unused variable: `unused_not_captured`\nHint: consider removing this variable or prefixing with underscore: `_unused_not_captured`",
-  "range": "2:1:2:30"
+  "range": "2:5:2:24"
  }
 ]
diff --git a/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@conditional_usage.typ.snap b/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@conditional_usage.typ.snap
index ec7f51507..2bff1c13f 100644
--- a/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@conditional_usage.typ.snap
+++ b/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@conditional_usage.typ.snap
@@ -54,6 +54,6 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/conditional_usage.typ
    }
   ],
   "message": "unused variable: `unused`\nHint: consider removing this variable or prefixing with underscore: `_unused`",
-  "range": "4:1:4:16"
+  "range": "4:5:4:11"
  }
 ]
diff --git a/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@contextual_usage.typ.snap b/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@contextual_usage.typ.snap
index 30be61cf7..3f86b57b0 100644
--- a/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@contextual_usage.typ.snap
+++ b/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@contextual_usage.typ.snap
@@ -54,6 +54,6 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/contextual_usage.typ
    }
   ],
   "message": "unused variable: `unused_ctx`\nHint: consider removing this variable or prefixing with underscore: `_unused_ctx`",
-  "range": "2:1:2:20"
+  "range": "2:5:2:15"
  }
 ]
diff --git a/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@destructuring_array.typ.snap b/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@destructuring_array.typ.snap
index f85d8bdd7..55a44b6ec 100644
--- a/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@destructuring_array.typ.snap
+++ b/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@destructuring_array.typ.snap
@@ -39,7 +39,7 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/destructuring_array.typ
    }
   ],
   "message": "unused variable: `unused_x`\nHint: consider removing this variable or prefixing with underscore: `_unused_x`",
-  "range": "6:1:6:46"
+  "range": "6:15:6:23"
  },
  {
   "actions": [
@@ -75,6 +75,6 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/destructuring_array.typ
    }
   ],
   "message": "unused variable: `c2`\nHint: consider removing this variable or prefixing with underscore: `_c2`",
-  "range": "6:1:6:46"
+  "range": "6:31:6:33"
  }
 ]
diff --git a/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@destructuring_dict.typ.snap b/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@destructuring_dict.typ.snap
index 654352e7e..b1b5faeef 100644
--- a/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@destructuring_dict.typ.snap
+++ b/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@destructuring_dict.typ.snap
@@ -39,7 +39,7 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/destructuring_dict.typ
    }
   ],
   "message": "unused variable: `unused_x`\nHint: consider removing this variable or prefixing with underscore: `_unused_x`",
-  "range": "6:1:6:52"
+  "range": "6:18:6:26"
  },
  {
   "actions": [
@@ -75,6 +75,6 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/destructuring_dict.typ
    }
   ],
   "message": "unused variable: `c2`\nHint: consider removing this variable or prefixing with underscore: `_c2`",
-  "range": "6:1:6:52"
+  "range": "6:37:6:39"
  }
 ]
diff --git a/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@destructuring_spread.typ.snap b/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@destructuring_spread.typ.snap
index 3b2b132a2..e663056ce 100644
--- a/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@destructuring_spread.typ.snap
+++ b/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@destructuring_spread.typ.snap
@@ -24,6 +24,6 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/destructuring_spread.ty
    }
   ],
   "message": "unused variable: `unused_rest`\nHint: consider removing this variable or prefixing with underscore: `_unused_rest`",
-  "range": "4:1:4:30"
+  "range": "4:11:4:22"
  }
 ]
diff --git a/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@method_chain.typ.snap b/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@method_chain.typ.snap
index 6b07643e2..39e4c3e75 100644
--- a/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@method_chain.typ.snap
+++ b/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@method_chain.typ.snap
@@ -54,6 +54,6 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/method_chain.typ
    }
   ],
   "message": "unused variable: `unused_obj`\nHint: consider removing this variable or prefixing with underscore: `_unused_obj`",
-  "range": "8:1:8:24"
+  "range": "8:5:8:15"
  }
 ]
diff --git a/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@multiple_unused.typ.snap b/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@multiple_unused.typ.snap
index 67b185c80..8c4468217 100644
--- a/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@multiple_unused.typ.snap
+++ b/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@multiple_unused.typ.snap
@@ -54,7 +54,7 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/multiple_unused.typ
    }
   ],
   "message": "unused variable: `unused1`\nHint: consider removing this variable or prefixing with underscore: `_unused1`",
-  "range": "1:1:1:16"
+  "range": "1:5:1:12"
  },
  {
   "actions": [
@@ -105,7 +105,7 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/multiple_unused.typ
    }
   ],
   "message": "unused variable: `unused2`\nHint: consider removing this variable or prefixing with underscore: `_unused2`",
-  "range": "2:1:2:16"
+  "range": "2:5:2:12"
  },
  {
   "actions": [
@@ -156,7 +156,7 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/multiple_unused.typ
    }
   ],
   "message": "unused variable: `unused3`\nHint: consider removing this variable or prefixing with underscore: `_unused3`",
-  "range": "4:1:4:16"
+  "range": "4:5:4:12"
  },
  {
   "actions": [
diff --git a/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@nested_scope.typ.snap b/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@nested_scope.typ.snap
index 84b96f559..8a3cc7fe5 100644
--- a/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@nested_scope.typ.snap
+++ b/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@nested_scope.typ.snap
@@ -54,6 +54,6 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/nested_scope.typ
    }
   ],
   "message": "unused variable: `inner_unused`\nHint: consider removing this variable or prefixing with underscore: `_inner_unused`",
-  "range": "4:2:4:22"
+  "range": "4:6:4:18"
  }
 ]
diff --git a/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@pattern_destructure.typ.snap b/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@pattern_destructure.typ.snap
index 5e6f0d4d0..8af90eea7 100644
--- a/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@pattern_destructure.typ.snap
+++ b/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@pattern_destructure.typ.snap
@@ -39,6 +39,6 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/pattern_destructure.typ
    }
   ],
   "message": "unused variable: `unused_b`\nHint: consider removing this variable or prefixing with underscore: `_unused_b`",
-  "range": "1:1:1:43"
+  "range": "1:14:1:22"
  }
 ]
diff --git a/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@shadowing.typ.snap b/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@shadowing.typ.snap
index bddef6046..c7fc4eeb0 100644
--- a/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@shadowing.typ.snap
+++ b/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@shadowing.typ.snap
@@ -54,6 +54,6 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/shadowing.typ
    }
   ],
   "message": "unused variable: `x`\nHint: consider removing this variable or prefixing with underscore: `_x`",
-  "range": "1:1:1:10"
+  "range": "1:5:1:6"
  }
 ]
diff --git a/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@show_set_rules.typ.snap b/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@show_set_rules.typ.snap
index 3bb95b15f..4d5d182b8 100644
--- a/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@show_set_rules.typ.snap
+++ b/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@show_set_rules.typ.snap
@@ -54,6 +54,6 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/show_set_rules.typ
    }
   ],
   "message": "unused variable: `unused_style`\nHint: consider removing this variable or prefixing with underscore: `_unused_style`",
-  "range": "1:1:1:23"
+  "range": "1:5:1:17"
  }
 ]
diff --git a/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@underscore_prefix.typ.snap b/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@underscore_prefix.typ.snap
index 9ab257a5f..f128cbdf1 100644
--- a/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@underscore_prefix.typ.snap
+++ b/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@underscore_prefix.typ.snap
@@ -54,6 +54,6 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/underscore_prefix.typ
    }
   ],
   "message": "unused variable: `normal_unused`\nHint: consider removing this variable or prefixing with underscore: `_normal_unused`",
-  "range": "4:1:4:24"
+  "range": "4:5:4:18"
  }
 ]
diff --git a/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@unused_variable.typ.snap b/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@unused_variable.typ.snap
index 06f757273..9c800dd61 100644
--- a/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@unused_variable.typ.snap
+++ b/crates/tinymist-query/src/fixtures/dead_code_code_action/snaps/run_dead_code_code_action_snapshots@unused_variable.typ.snap
@@ -54,6 +54,6 @@ input_file: crates/tinymist-query/src/fixtures/dead_code/unused_variable.typ
    }
   ],
   "message": "unused variable: `unused_var`\nHint: consider removing this variable or prefixing with underscore: `_unused_var`",
-  "range": "1:1:1:20"
+  "range": "1:5:1:15"
  }
 ]
diff --git a/crates/tinymist-query/src/fixtures/dead_code_exported/exported_unused.typ b/crates/tinymist-query/src/fixtures/dead_code_exported/exported_unused.typ
new file mode 100644
index 000000000..844124683
--- /dev/null
+++ b/crates/tinymist-query/src/fixtures/dead_code_exported/exported_unused.typ
@@ -0,0 +1,7 @@
+/// path: main.typ
+/// compile: true
+
+#let api(x) = x
+
+#let value = 1
+#value
diff --git a/crates/tinymist-query/src/fixtures/dead_code_exported/exported_unused_docstring.typ b/crates/tinymist-query/src/fixtures/dead_code_exported/exported_unused_docstring.typ
new file mode 100644
index 000000000..9bbef2977
--- /dev/null
+++ b/crates/tinymist-query/src/fixtures/dead_code_exported/exported_unused_docstring.typ
@@ -0,0 +1,8 @@
+/// path: main.typ
+/// compile: true
+
+/// Public API documentation.
+#let api(x) = x
+
+#let value = 1
+#value
diff --git a/crates/tinymist-query/src/fixtures/dead_code_exported/snaps/dead_code_exported@exported_unused.typ.snap b/crates/tinymist-query/src/fixtures/dead_code_exported/snaps/dead_code_exported@exported_unused.typ.snap
new file mode 100644
index 000000000..949341e2a
--- /dev/null
+++ b/crates/tinymist-query/src/fixtures/dead_code_exported/snaps/dead_code_exported@exported_unused.typ.snap
@@ -0,0 +1,19 @@
+---
+source: crates/tinymist-query/src/analysis.rs
+expression: "JsonRepr::new_redacted(result, &REDACT_LOC)"
+input_file: crates/tinymist-query/src/fixtures/dead_code_exported/exported_unused.typ
+---
+{
+ "main.typ": [
+  {
+   "code": "tinymist.unused.symbol",
+   "message": "unused function: `api`\nHint: this function is exported but never used",
+   "range": "2:5:2:8",
+   "severity": 4,
+   "source": "typst",
+   "tags": [
+    1
+   ]
+  }
+ ]
+}
diff --git a/crates/tinymist-query/src/fixtures/dead_code_exported/snaps/dead_code_exported@exported_unused_docstring.typ.snap b/crates/tinymist-query/src/fixtures/dead_code_exported/snaps/dead_code_exported@exported_unused_docstring.typ.snap
new file mode 100644
index 000000000..2a2866bd2
--- /dev/null
+++ b/crates/tinymist-query/src/fixtures/dead_code_exported/snaps/dead_code_exported@exported_unused_docstring.typ.snap
@@ -0,0 +1,16 @@
+---
+source: crates/tinymist-query/src/analysis.rs
+expression: "JsonRepr::new_redacted(result, &REDACT_LOC)"
+input_file: crates/tinymist-query/src/fixtures/dead_code_exported/exported_unused_docstring.typ
+---
+{
+ "main.typ": [
+  {
+   "code": "tinymist.unused.exported_documented_function",
+   "message": "unused function: `api`\nHint: this function is exported but never used\nHint: this function is exported and documented; it may be part of the public API\nHint: if this is intended public API, you can ignore this diagnostic; otherwise consider removing it",
+   "range": "3:5:3:8",
+   "severity": 4,
+   "source": "typst"
+  }
+ ]
+}
diff --git a/crates/tinymist-query/src/fixtures/lint/snaps/test@assign_ok.typ.snap b/crates/tinymist-query/src/fixtures/lint/snaps/test@assign_ok.typ.snap
index 467a5d294..fac3e34c4 100644
--- a/crates/tinymist-query/src/fixtures/lint/snaps/test@assign_ok.typ.snap
+++ b/crates/tinymist-query/src/fixtures/lint/snaps/test@assign_ok.typ.snap
@@ -6,6 +6,7 @@ input_file: crates/tinymist-query/src/fixtures/lint/assign_ok.typ
 {
  "s0.typ": [
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused function: `f`\nHint: consider removing this function or prefixing with underscore: `_f`",
    "range": "0:5:0:6",
    "severity": 4,
diff --git a/crates/tinymist-query/src/fixtures/lint/snaps/test@binary.typ.snap b/crates/tinymist-query/src/fixtures/lint/snaps/test@binary.typ.snap
index 4b09a6d25..4df6567cb 100644
--- a/crates/tinymist-query/src/fixtures/lint/snaps/test@binary.typ.snap
+++ b/crates/tinymist-query/src/fixtures/lint/snaps/test@binary.typ.snap
@@ -6,6 +6,7 @@ input_file: crates/tinymist-query/src/fixtures/lint/binary.typ
 {
  "s0.typ": [
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused function: `f`\nHint: consider removing this function or prefixing with underscore: `_f`",
    "range": "0:5:0:6",
    "severity": 4,
diff --git a/crates/tinymist-query/src/fixtures/lint/snaps/test@binary_type_compare_str.typ.snap b/crates/tinymist-query/src/fixtures/lint/snaps/test@binary_type_compare_str.typ.snap
index e9b4d18a9..577ce7ce2 100644
--- a/crates/tinymist-query/src/fixtures/lint/snaps/test@binary_type_compare_str.typ.snap
+++ b/crates/tinymist-query/src/fixtures/lint/snaps/test@binary_type_compare_str.typ.snap
@@ -12,6 +12,7 @@ input_file: crates/tinymist-query/src/fixtures/lint/binary_type_compare_str.typ
    "source": "typst"
   },
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused function: `f`\nHint: consider removing this function or prefixing with underscore: `_f`",
    "range": "0:5:0:6",
    "severity": 4,
diff --git a/crates/tinymist-query/src/fixtures/lint/snaps/test@binary_type_compare_str_input.typ.snap b/crates/tinymist-query/src/fixtures/lint/snaps/test@binary_type_compare_str_input.typ.snap
index 116093218..d04cc9677 100644
--- a/crates/tinymist-query/src/fixtures/lint/snaps/test@binary_type_compare_str_input.typ.snap
+++ b/crates/tinymist-query/src/fixtures/lint/snaps/test@binary_type_compare_str_input.typ.snap
@@ -6,6 +6,7 @@ input_file: crates/tinymist-query/src/fixtures/lint/binary_type_compare_str_inpu
 {
  "s0.typ": [
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused function: `f`\nHint: consider removing this function or prefixing with underscore: `_f`",
    "range": "0:5:0:6",
    "severity": 4,
diff --git a/crates/tinymist-query/src/fixtures/lint/snaps/test@binary_type_compare_str_let.typ.snap b/crates/tinymist-query/src/fixtures/lint/snaps/test@binary_type_compare_str_let.typ.snap
index 6a6095416..d52ae641b 100644
--- a/crates/tinymist-query/src/fixtures/lint/snaps/test@binary_type_compare_str_let.typ.snap
+++ b/crates/tinymist-query/src/fixtures/lint/snaps/test@binary_type_compare_str_let.typ.snap
@@ -6,6 +6,7 @@ input_file: crates/tinymist-query/src/fixtures/lint/binary_type_compare_str_let.
 {
  "s0.typ": [
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused function: `f`\nHint: consider removing this function or prefixing with underscore: `_f`",
    "range": "0:5:0:6",
    "severity": 4,
diff --git a/crates/tinymist-query/src/fixtures/lint/snaps/test@break_for.typ.snap b/crates/tinymist-query/src/fixtures/lint/snaps/test@break_for.typ.snap
index f150c1f06..a29e362e3 100644
--- a/crates/tinymist-query/src/fixtures/lint/snaps/test@break_for.typ.snap
+++ b/crates/tinymist-query/src/fixtures/lint/snaps/test@break_for.typ.snap
@@ -6,6 +6,7 @@ input_file: crates/tinymist-query/src/fixtures/lint/break_for.typ
 {
  "s0.typ": [
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused variable: `value`\nHint: consider removing this variable or prefixing with underscore: `_value`",
    "range": "0:5:0:10",
    "severity": 4,
diff --git a/crates/tinymist-query/src/fixtures/lint/snaps/test@break_func_for.typ.snap b/crates/tinymist-query/src/fixtures/lint/snaps/test@break_func_for.typ.snap
index b109b8d4f..73d5a66d8 100644
--- a/crates/tinymist-query/src/fixtures/lint/snaps/test@break_func_for.typ.snap
+++ b/crates/tinymist-query/src/fixtures/lint/snaps/test@break_func_for.typ.snap
@@ -20,6 +20,7 @@ input_file: crates/tinymist-query/src/fixtures/lint/break_func_for.typ
    "source": "typst"
   },
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused variable: `value`\nHint: consider removing this variable or prefixing with underscore: `_value`",
    "range": "0:5:0:10",
    "severity": 4,
diff --git a/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_array.typ.snap b/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_array.typ.snap
index a022b6b8d..c7aab227d 100644
--- a/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_array.typ.snap
+++ b/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_array.typ.snap
@@ -12,6 +12,7 @@ input_file: crates/tinymist-query/src/fixtures/lint/discard_array.typ
    "source": "typst"
   },
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused function: `f`\nHint: consider removing this function or prefixing with underscore: `_f`",
    "range": "0:5:0:6",
    "severity": 4,
diff --git a/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_common.typ.snap b/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_common.typ.snap
index e9d4f484c..5ae41afbb 100644
--- a/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_common.typ.snap
+++ b/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_common.typ.snap
@@ -18,6 +18,7 @@ input_file: crates/tinymist-query/src/fixtures/lint/discard_common.typ
    "source": "typst"
   },
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused function: `f`\nHint: consider removing this function or prefixing with underscore: `_f`",
    "range": "0:5:0:6",
    "severity": 4,
diff --git a/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_common_break.typ.snap b/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_common_break.typ.snap
index 2ebbc2d42..b8b5275e8 100644
--- a/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_common_break.typ.snap
+++ b/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_common_break.typ.snap
@@ -6,6 +6,7 @@ input_file: crates/tinymist-query/src/fixtures/lint/discard_common_break.typ
 {
  "s0.typ": [
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused function: `f`\nHint: consider removing this function or prefixing with underscore: `_f`",
    "range": "0:5:0:6",
    "severity": 4,
diff --git a/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_common_break2.typ.snap b/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_common_break2.typ.snap
index 092ffcce7..d419a02d7 100644
--- a/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_common_break2.typ.snap
+++ b/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_common_break2.typ.snap
@@ -6,6 +6,7 @@ input_file: crates/tinymist-query/src/fixtures/lint/discard_common_break2.typ
 {
  "s0.typ": [
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused function: `f`\nHint: consider removing this function or prefixing with underscore: `_f`",
    "range": "0:5:0:6",
    "severity": 4,
diff --git a/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_equation.typ.snap b/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_equation.typ.snap
index df7032275..a493a8ed0 100644
--- a/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_equation.typ.snap
+++ b/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_equation.typ.snap
@@ -12,6 +12,7 @@ input_file: crates/tinymist-query/src/fixtures/lint/discard_equation.typ
    "source": "typst"
   },
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused function: `f`\nHint: consider removing this function or prefixing with underscore: `_f`",
    "range": "0:5:0:6",
    "severity": 4,
diff --git a/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_for.typ.snap b/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_for.typ.snap
index 3f72164e1..6ac71bda8 100644
--- a/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_for.typ.snap
+++ b/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_for.typ.snap
@@ -12,6 +12,7 @@ input_file: crates/tinymist-query/src/fixtures/lint/discard_for.typ
    "source": "typst"
   },
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused function: `f`\nHint: consider removing this function or prefixing with underscore: `_f`",
    "range": "0:5:0:6",
    "severity": 4,
@@ -21,8 +22,9 @@ input_file: crates/tinymist-query/src/fixtures/lint/discard_for.typ
    ]
   },
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused variable: `i`\nHint: consider removing this variable or prefixing with underscore: `_i`",
-   "range": "0:1:3:1",
+   "range": "0:15:0:16",
    "severity": 4,
    "source": "typst",
    "tags": [
diff --git a/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_for2.typ.snap b/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_for2.typ.snap
index 6415cc892..657a0421e 100644
--- a/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_for2.typ.snap
+++ b/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_for2.typ.snap
@@ -12,6 +12,7 @@ input_file: crates/tinymist-query/src/fixtures/lint/discard_for2.typ
    "source": "typst"
   },
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused function: `f`\nHint: consider removing this function or prefixing with underscore: `_f`",
    "range": "0:5:0:6",
    "severity": 4,
@@ -21,8 +22,9 @@ input_file: crates/tinymist-query/src/fixtures/lint/discard_for2.typ
    ]
   },
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused variable: `i`\nHint: consider removing this variable or prefixing with underscore: `_i`",
-   "range": "0:1:3:1",
+   "range": "0:15:0:16",
    "severity": 4,
    "source": "typst",
    "tags": [
diff --git a/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_for3.typ.snap b/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_for3.typ.snap
index 2a3f5923d..ab46bd0e4 100644
--- a/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_for3.typ.snap
+++ b/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_for3.typ.snap
@@ -12,6 +12,7 @@ input_file: crates/tinymist-query/src/fixtures/lint/discard_for3.typ
    "source": "typst"
   },
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused function: `f`\nHint: consider removing this function or prefixing with underscore: `_f`",
    "range": "0:5:0:6",
    "severity": 4,
@@ -21,8 +22,9 @@ input_file: crates/tinymist-query/src/fixtures/lint/discard_for3.typ
    ]
   },
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused variable: `i`\nHint: consider removing this variable or prefixing with underscore: `_i`",
-   "range": "0:1:2:1",
+   "range": "0:15:0:16",
    "severity": 4,
    "source": "typst",
    "tags": [
diff --git a/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_for4.typ.snap b/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_for4.typ.snap
index de89600f9..617598990 100644
--- a/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_for4.typ.snap
+++ b/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_for4.typ.snap
@@ -12,6 +12,7 @@ input_file: crates/tinymist-query/src/fixtures/lint/discard_for4.typ
    "source": "typst"
   },
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused function: `f`\nHint: consider removing this function or prefixing with underscore: `_f`",
    "range": "0:5:0:6",
    "severity": 4,
@@ -21,8 +22,9 @@ input_file: crates/tinymist-query/src/fixtures/lint/discard_for4.typ
    ]
   },
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused variable: `i`\nHint: consider removing this variable or prefixing with underscore: `_i`",
-   "range": "0:1:3:1",
+   "range": "0:15:0:16",
    "severity": 4,
    "source": "typst",
    "tags": [
diff --git a/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_for5.typ.snap b/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_for5.typ.snap
index d487c7027..9a2a5831e 100644
--- a/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_for5.typ.snap
+++ b/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_for5.typ.snap
@@ -12,6 +12,7 @@ input_file: crates/tinymist-query/src/fixtures/lint/discard_for5.typ
    "source": "typst"
   },
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused function: `f`\nHint: consider removing this function or prefixing with underscore: `_f`",
    "range": "0:5:0:6",
    "severity": 4,
@@ -21,8 +22,9 @@ input_file: crates/tinymist-query/src/fixtures/lint/discard_for5.typ
    ]
   },
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused variable: `i`\nHint: consider removing this variable or prefixing with underscore: `_i`",
-   "range": "0:1:3:1",
+   "range": "0:15:0:16",
    "severity": 4,
    "source": "typst",
    "tags": [
diff --git a/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_hello.typ.snap b/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_hello.typ.snap
index b908ddb41..c333b4f60 100644
--- a/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_hello.typ.snap
+++ b/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_hello.typ.snap
@@ -12,6 +12,7 @@ input_file: crates/tinymist-query/src/fixtures/lint/discard_hello.typ
    "source": "typst"
   },
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused function: `f`\nHint: consider removing this function or prefixing with underscore: `_f`",
    "range": "0:5:0:6",
    "severity": 4,
diff --git a/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_if.typ.snap b/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_if.typ.snap
index 8137ce3a1..339c0c5c5 100644
--- a/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_if.typ.snap
+++ b/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_if.typ.snap
@@ -12,6 +12,7 @@ input_file: crates/tinymist-query/src/fixtures/lint/discard_if.typ
    "source": "typst"
   },
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused function: `f`\nHint: consider removing this function or prefixing with underscore: `_f`",
    "range": "0:5:0:6",
    "severity": 4,
diff --git a/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_if2.typ.snap b/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_if2.typ.snap
index 3adef77ef..a1c456a9a 100644
--- a/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_if2.typ.snap
+++ b/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_if2.typ.snap
@@ -18,6 +18,7 @@ input_file: crates/tinymist-query/src/fixtures/lint/discard_if2.typ
    "source": "typst"
   },
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused function: `f`\nHint: consider removing this function or prefixing with underscore: `_f`",
    "range": "0:5:0:6",
    "severity": 4,
diff --git a/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_join.typ.snap b/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_join.typ.snap
index d0d1d643e..23a05e777 100644
--- a/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_join.typ.snap
+++ b/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_join.typ.snap
@@ -18,6 +18,7 @@ input_file: crates/tinymist-query/src/fixtures/lint/discard_join.typ
    "source": "typst"
   },
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused function: `f`\nHint: consider removing this function or prefixing with underscore: `_f`",
    "range": "0:5:0:6",
    "severity": 4,
diff --git a/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_join_partial.typ.snap b/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_join_partial.typ.snap
index 0115108fe..5ff62a215 100644
--- a/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_join_partial.typ.snap
+++ b/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_join_partial.typ.snap
@@ -12,6 +12,7 @@ input_file: crates/tinymist-query/src/fixtures/lint/discard_join_partial.typ
    "source": "typst"
   },
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused function: `f`\nHint: consider removing this function or prefixing with underscore: `_f`",
    "range": "0:5:0:6",
    "severity": 4,
diff --git a/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_join_partial2.typ.snap b/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_join_partial2.typ.snap
index 857355783..698050b33 100644
--- a/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_join_partial2.typ.snap
+++ b/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_join_partial2.typ.snap
@@ -12,6 +12,7 @@ input_file: crates/tinymist-query/src/fixtures/lint/discard_join_partial2.typ
    "source": "typst"
   },
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused function: `f`\nHint: consider removing this function or prefixing with underscore: `_f`",
    "range": "0:5:0:6",
    "severity": 4,
diff --git a/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_set.typ.snap b/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_set.typ.snap
index ee9373eeb..15985d044 100644
--- a/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_set.typ.snap
+++ b/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_set.typ.snap
@@ -12,6 +12,7 @@ input_file: crates/tinymist-query/src/fixtures/lint/discard_set.typ
    "source": "typst"
   },
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused function: `f`\nHint: consider removing this function or prefixing with underscore: `_f`",
    "range": "0:5:0:6",
    "severity": 4,
diff --git a/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_show.typ.snap b/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_show.typ.snap
index 8b2ce826f..ecbc75aed 100644
--- a/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_show.typ.snap
+++ b/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_show.typ.snap
@@ -12,6 +12,7 @@ input_file: crates/tinymist-query/src/fixtures/lint/discard_show.typ
    "source": "typst"
   },
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused function: `f`\nHint: consider removing this function or prefixing with underscore: `_f`",
    "range": "0:5:0:6",
    "severity": 4,
diff --git a/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_show_content.typ.snap b/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_show_content.typ.snap
index 7c6f695f2..f32ff1294 100644
--- a/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_show_content.typ.snap
+++ b/crates/tinymist-query/src/fixtures/lint/snaps/test@discard_show_content.typ.snap
@@ -12,6 +12,7 @@ input_file: crates/tinymist-query/src/fixtures/lint/discard_show_content.typ
    "source": "typst"
   },
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused function: `f`\nHint: consider removing this function or prefixing with underscore: `_f`",
    "range": "0:5:0:6",
    "severity": 4,
diff --git a/crates/tinymist-query/src/fixtures/lint/snaps/test@return_loop2.typ.snap b/crates/tinymist-query/src/fixtures/lint/snaps/test@return_loop2.typ.snap
index 52167c473..a9ef631ac 100644
--- a/crates/tinymist-query/src/fixtures/lint/snaps/test@return_loop2.typ.snap
+++ b/crates/tinymist-query/src/fixtures/lint/snaps/test@return_loop2.typ.snap
@@ -6,6 +6,7 @@ input_file: crates/tinymist-query/src/fixtures/lint/return_loop2.typ
 {
  "s0.typ": [
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused function: `f`\nHint: consider removing this function or prefixing with underscore: `_f`",
    "range": "0:5:0:6",
    "severity": 4,
diff --git a/crates/tinymist-query/src/fixtures/lint/snaps/test@return_loop3.typ.snap b/crates/tinymist-query/src/fixtures/lint/snaps/test@return_loop3.typ.snap
index 01ecddd56..1715dd105 100644
--- a/crates/tinymist-query/src/fixtures/lint/snaps/test@return_loop3.typ.snap
+++ b/crates/tinymist-query/src/fixtures/lint/snaps/test@return_loop3.typ.snap
@@ -6,6 +6,7 @@ input_file: crates/tinymist-query/src/fixtures/lint/return_loop3.typ
 {
  "s0.typ": [
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused function: `mul-mat`\nHint: consider removing this function or prefixing with underscore: `_mul-mat`",
    "range": "0:5:0:12",
    "severity": 4,
@@ -15,8 +16,9 @@ input_file: crates/tinymist-query/src/fixtures/lint/return_loop3.typ
    ]
   },
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused variable: `matrix`\nHint: consider removing this variable or prefixing with underscore: `_matrix`",
-   "range": "0:1:9:1",
+   "range": "3:6:3:12",
    "severity": 4,
    "source": "typst",
    "tags": [
diff --git a/crates/tinymist-query/src/fixtures/lint/snaps/test@return_partial.typ.snap b/crates/tinymist-query/src/fixtures/lint/snaps/test@return_partial.typ.snap
index fac2d0e40..4eff67493 100644
--- a/crates/tinymist-query/src/fixtures/lint/snaps/test@return_partial.typ.snap
+++ b/crates/tinymist-query/src/fixtures/lint/snaps/test@return_partial.typ.snap
@@ -6,6 +6,7 @@ input_file: crates/tinymist-query/src/fixtures/lint/return_partial.typ
 {
  "s0.typ": [
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused function: `f`\nHint: consider removing this function or prefixing with underscore: `_f`",
    "range": "0:5:0:6",
    "severity": 4,
diff --git a/crates/tinymist-query/src/fixtures/lint/snaps/test@return_partial2.typ.snap b/crates/tinymist-query/src/fixtures/lint/snaps/test@return_partial2.typ.snap
index d142cd4d5..e532834db 100644
--- a/crates/tinymist-query/src/fixtures/lint/snaps/test@return_partial2.typ.snap
+++ b/crates/tinymist-query/src/fixtures/lint/snaps/test@return_partial2.typ.snap
@@ -6,6 +6,7 @@ input_file: crates/tinymist-query/src/fixtures/lint/return_partial2.typ
 {
  "s0.typ": [
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused function: `as-padding-dict`\nHint: consider removing this function or prefixing with underscore: `_as-padding-dict`",
    "range": "0:5:0:20",
    "severity": 4,
diff --git a/crates/tinymist-query/src/fixtures/lint/snaps/test@return_partial_if.typ.snap b/crates/tinymist-query/src/fixtures/lint/snaps/test@return_partial_if.typ.snap
index 85e657990..541746101 100644
--- a/crates/tinymist-query/src/fixtures/lint/snaps/test@return_partial_if.typ.snap
+++ b/crates/tinymist-query/src/fixtures/lint/snaps/test@return_partial_if.typ.snap
@@ -6,6 +6,7 @@ input_file: crates/tinymist-query/src/fixtures/lint/return_partial_if.typ
 {
  "s0.typ": [
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused function: `get-op`\nHint: consider removing this function or prefixing with underscore: `_get-op`",
    "range": "0:5:0:11",
    "severity": 4,
diff --git a/crates/tinymist-query/src/fixtures/lint/snaps/test@return_regular.typ.snap b/crates/tinymist-query/src/fixtures/lint/snaps/test@return_regular.typ.snap
index bbb75c0cd..3aa052232 100644
--- a/crates/tinymist-query/src/fixtures/lint/snaps/test@return_regular.typ.snap
+++ b/crates/tinymist-query/src/fixtures/lint/snaps/test@return_regular.typ.snap
@@ -6,6 +6,7 @@ input_file: crates/tinymist-query/src/fixtures/lint/return_regular.typ
 {
  "s0.typ": [
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused function: `f`\nHint: consider removing this function or prefixing with underscore: `_f`",
    "range": "0:5:0:6",
    "severity": 4,
diff --git a/crates/tinymist-query/src/fixtures/lint/snaps/test@show_good.typ.snap b/crates/tinymist-query/src/fixtures/lint/snaps/test@show_good.typ.snap
index d933d2cbc..796c197ac 100644
--- a/crates/tinymist-query/src/fixtures/lint/snaps/test@show_good.typ.snap
+++ b/crates/tinymist-query/src/fixtures/lint/snaps/test@show_good.typ.snap
@@ -6,6 +6,7 @@ input_file: crates/tinymist-query/src/fixtures/lint/show_good.typ
 {
  "s0.typ": [
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused function: `f`\nHint: consider removing this function or prefixing with underscore: `_f`",
    "range": "0:5:0:6",
    "severity": 4,
diff --git a/crates/tinymist-query/src/fixtures/lint/snaps/test@show_good2.typ.snap b/crates/tinymist-query/src/fixtures/lint/snaps/test@show_good2.typ.snap
index da5f15c41..88cfbdc75 100644
--- a/crates/tinymist-query/src/fixtures/lint/snaps/test@show_good2.typ.snap
+++ b/crates/tinymist-query/src/fixtures/lint/snaps/test@show_good2.typ.snap
@@ -6,6 +6,7 @@ input_file: crates/tinymist-query/src/fixtures/lint/show_good2.typ
 {
  "s0.typ": [
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused function: `f`\nHint: consider removing this function or prefixing with underscore: `_f`",
    "range": "0:5:0:6",
    "severity": 4,
diff --git a/crates/tinymist-query/src/fixtures/lint/snaps/test@while_good.typ.snap b/crates/tinymist-query/src/fixtures/lint/snaps/test@while_good.typ.snap
index a162f59b1..24a954b9d 100644
--- a/crates/tinymist-query/src/fixtures/lint/snaps/test@while_good.typ.snap
+++ b/crates/tinymist-query/src/fixtures/lint/snaps/test@while_good.typ.snap
@@ -6,6 +6,7 @@ input_file: crates/tinymist-query/src/fixtures/lint/while_good.typ
 {
  "s0.typ": [
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused function: `f`\nHint: consider removing this function or prefixing with underscore: `_f`",
    "range": "0:5:0:6",
    "severity": 4,
diff --git a/crates/tinymist-query/src/fixtures/lint/snaps/test@while_good2.typ.snap b/crates/tinymist-query/src/fixtures/lint/snaps/test@while_good2.typ.snap
index 1a4fadf28..94aa1cfa8 100644
--- a/crates/tinymist-query/src/fixtures/lint/snaps/test@while_good2.typ.snap
+++ b/crates/tinymist-query/src/fixtures/lint/snaps/test@while_good2.typ.snap
@@ -6,6 +6,7 @@ input_file: crates/tinymist-query/src/fixtures/lint/while_good2.typ
 {
  "s0.typ": [
   {
+   "code": "tinymist.unused.symbol",
    "message": "unused function: `f`\nHint: consider removing this function or prefixing with underscore: `_f`",
    "range": "0:5:0:6",
    "severity": 4,