diff --git a/plugin/vscode/quick-lint-js/vscode/qljs-document.cpp b/plugin/vscode/quick-lint-js/vscode/qljs-document.cpp
index 94d0b4b7f9..bbbe6fe10f 100644
--- a/plugin/vscode/quick-lint-js/vscode/qljs-document.cpp
+++ b/plugin/vscode/quick-lint-js/vscode/qljs-document.cpp
@@ -22,7 +22,7 @@ void QLJS_Config_Document::after_modification(::Napi::Env env,
 void QLJS_Lintable_Document::after_modification(
     ::Napi::Env env, QLJS_Workspace& workspace,
     VSCode_Diagnostic_Collection diagnostic_collection) {
-  this->lint_javascript_and_publish_diagnostics(env, workspace.vscode_,
+  this->lint_javascript_and_publish_diagnostics(env, workspace,
                                                 diagnostic_collection);
 }
 
@@ -61,10 +61,10 @@ void QLJS_Config_Document::finish_init(
   auto loaded_config_result =
       workspace.config_loader_.watch_and_load_config_file(*file_path, this);
   if (loaded_config_result.ok()) {
+    this->loaded_config_ = *loaded_config_result;
     workspace.vscode_.load_non_persistent(env);
-    this->lint_config_and_publish_diagnostics(env, workspace.vscode_,
-                                              workspace.diagnostic_collection(),
-                                              *loaded_config_result);
+    this->lint_config_and_publish_diagnostics(
+        env, workspace, workspace.diagnostic_collection());
   } else {
     QLJS_UNIMPLEMENTED();
   }
@@ -74,16 +74,26 @@ void QLJS_Config_Document::on_config_file_changed(
     ::Napi::Env env, QLJS_Workspace& workspace,
     VSCode_Diagnostic_Collection diagnostic_collection,
     Loaded_Config_File* config_file) {
-  this->lint_config_and_publish_diagnostics(env, workspace.vscode_,
-                                            diagnostic_collection, config_file);
+  this->loaded_config_ = config_file;
+  this->lint_config_and_publish_diagnostics(env, workspace,
+                                            diagnostic_collection);
 }
 
 void QLJS_Config_Document::lint_config_and_publish_diagnostics(
-    ::Napi::Env env, VSCode_Module& vscode,
-    VSCode_Diagnostic_Collection diagnostic_collection,
-    Loaded_Config_File* loaded_config) {
-  diagnostic_collection.set(this->uri(),
-                            this->lint_config(env, &vscode, loaded_config));
+    ::Napi::Env env, QLJS_Workspace& workspace,
+    VSCode_Diagnostic_Collection diagnostic_collection) {
+  diagnostic_collection.set(this->uri(), this->lint_config(env, workspace));
+}
+
+::Napi::Array QLJS_Config_Document::lint_config(::Napi::Env env,
+                                                QLJS_Workspace& workspace) {
+  workspace.vscode_.load_non_persistent(env);
+
+  LSP_Locator locator(&this->loaded_config_->file_content);
+  VSCode_Diag_Reporter diag_reporter(&workspace.vscode_, env, &locator,
+                                     this->uri(), workspace.translator_);
+  diag_reporter.report(this->loaded_config_->errors);
+  return std::move(diag_reporter).diagnostics();
 }
 
 void QLJS_Lintable_Document::on_config_file_changed(
@@ -92,14 +102,30 @@ void QLJS_Lintable_Document::on_config_file_changed(
     Loaded_Config_File* config_file) {
   this->config_ =
       config_file ? &config_file->config : &workspace.default_config_;
-  this->lint_javascript_and_publish_diagnostics(env, workspace.vscode_,
+  this->lint_javascript_and_publish_diagnostics(env, workspace,
                                                 diagnostic_collection);
 }
 
 void QLJS_Lintable_Document::lint_javascript_and_publish_diagnostics(
-    ::Napi::Env env, VSCode_Module& vscode,
+    ::Napi::Env env, QLJS_Workspace& workspace,
     VSCode_Diagnostic_Collection diagnostic_collection) {
-  diagnostic_collection.set(this->uri(), this->lint_javascript(env, &vscode));
+  diagnostic_collection.set(this->uri(), this->lint_javascript(env, workspace));
+}
+
+::Napi::Array QLJS_Lintable_Document::lint_javascript(
+    ::Napi::Env env, QLJS_Workspace& workspace) {
+  VSCode_Module& vscode = workspace.vscode_;
+  vscode.load_non_persistent(env);
+
+  VSCode_Diag_Reporter diag_reporter(&vscode, env, &this->document_.locator(),
+                                     this->uri(), workspace.translator_);
+  parse_and_lint(this->document_.string(), diag_reporter,
+                 Linter_Options{
+                     .language = this->language_,
+                     .configuration = this->config_,
+                 });
+
+  return std::move(diag_reporter).diagnostics();
 }
 }
 
diff --git a/plugin/vscode/quick-lint-js/vscode/qljs-document.h b/plugin/vscode/quick-lint-js/vscode/qljs-document.h
index 79ce2be877..d3150150af 100644
--- a/plugin/vscode/quick-lint-js/vscode/qljs-document.h
+++ b/plugin/vscode/quick-lint-js/vscode/qljs-document.h
@@ -120,19 +120,12 @@ class QLJS_Config_Document : public QLJS_Document_Base {
                               Loaded_Config_File* config_file) override;
 
  private:
-  void lint_config_and_publish_diagnostics(::Napi::Env, VSCode_Module&,
-                                           VSCode_Diagnostic_Collection,
-                                           Loaded_Config_File* loaded_config);
-
-  ::Napi::Array lint_config(::Napi::Env env, VSCode_Module* vscode,
-                            Loaded_Config_File* loaded_config) {
-    vscode->load_non_persistent(env);
-
-    LSP_Locator locator(&loaded_config->file_content);
-    VSCode_Diag_Reporter diag_reporter(vscode, env, &locator, this->uri());
-    diag_reporter.report(loaded_config->errors);
-    return std::move(diag_reporter).diagnostics();
-  }
+  void lint_config_and_publish_diagnostics(::Napi::Env, QLJS_Workspace&,
+                                           VSCode_Diagnostic_Collection);
+
+  ::Napi::Array lint_config(::Napi::Env env, QLJS_Workspace& workspace);
+
+  Loaded_Config_File* loaded_config_ = nullptr;
 };
 
 class QLJS_Lintable_Document : public QLJS_Document_Base {
@@ -150,23 +143,11 @@ class QLJS_Lintable_Document : public QLJS_Document_Base {
                               VSCode_Diagnostic_Collection,
                               Loaded_Config_File* config_file) override;
 
-  void lint_javascript_and_publish_diagnostics(::Napi::Env, VSCode_Module&,
+  void lint_javascript_and_publish_diagnostics(::Napi::Env, QLJS_Workspace&,
                                                VSCode_Diagnostic_Collection);
 
  private:
-  ::Napi::Array lint_javascript(::Napi::Env env, VSCode_Module* vscode) {
-    vscode->load_non_persistent(env);
-
-    VSCode_Diag_Reporter diag_reporter(vscode, env, &this->document_.locator(),
-                                       this->uri());
-    parse_and_lint(this->document_.string(), diag_reporter,
-                   Linter_Options{
-                       .language = this->language_,
-                       .configuration = this->config_,
-                   });
-
-    return std::move(diag_reporter).diagnostics();
-  }
+  ::Napi::Array lint_javascript(::Napi::Env env, QLJS_Workspace& workspace);
 
   Configuration* config_;  // Initialized by finish_init.
 
diff --git a/plugin/vscode/quick-lint-js/vscode/qljs-workspace.h b/plugin/vscode/quick-lint-js/vscode/qljs-workspace.h
index 43f15ddd19..b02f6dbb66 100644
--- a/plugin/vscode/quick-lint-js/vscode/qljs-workspace.h
+++ b/plugin/vscode/quick-lint-js/vscode/qljs-workspace.h
@@ -248,6 +248,8 @@ class QLJS_Workspace : public ::Napi::ObjectWrap<QLJS_Workspace> {
     QLJS_Workspace* workspace_;
   };
 
+ private:
+  Translator translator_;
   bool disposed_ = false;
   VSCode_Tracer tracer_;
   VSCode_Module vscode_;
diff --git a/plugin/vscode/quick-lint-js/vscode/vscode-diag-reporter.h b/plugin/vscode/quick-lint-js/vscode/vscode-diag-reporter.h
index fb32c15e8f..e9e9c3c2da 100644
--- a/plugin/vscode/quick-lint-js/vscode/vscode-diag-reporter.h
+++ b/plugin/vscode/quick-lint-js/vscode/vscode-diag-reporter.h
@@ -18,8 +18,9 @@ class VSCode_Diag_Formatter
   explicit VSCode_Diag_Formatter(VSCode_Module* vscode, ::Napi::Env env,
                                  ::Napi::Array diagnostics,
                                  const LSP_Locator* locator,
-                                 ::Napi::Value document_uri)
-      : Diagnostic_Formatter(qljs_messages),
+                                 ::Napi::Value document_uri,
+                                 Translator message_translator)
+      : Diagnostic_Formatter(message_translator),
         vscode_(vscode),
         env_(env),
         diagnostics_(diagnostics),
@@ -129,12 +130,14 @@ class VSCode_Diag_Reporter final : public Diag_Reporter {
  public:
   explicit VSCode_Diag_Reporter(VSCode_Module* vscode, ::Napi::Env env,
                                 const LSP_Locator* locator,
-                                ::Napi::Value document_uri)
+                                ::Napi::Value document_uri,
+                                Translator message_translator)
       : vscode_(vscode),
         env_(env),
         diagnostics_(::Napi::Array::New(env)),
         locator_(locator),
-        document_uri_(document_uri) {}
+        document_uri_(document_uri),
+        message_translator_(message_translator) {}
 
   ::Napi::Array diagnostics() const { return this->diagnostics_; }
 
@@ -144,7 +147,8 @@ class VSCode_Diag_Reporter final : public Diag_Reporter {
         /*env=*/this->env_,
         /*diagnostics=*/this->diagnostics_,
         /*locator=*/this->locator_,
-        /*document_uri=*/this->document_uri_);
+        /*document_uri=*/this->document_uri_,
+        /*message_translator=*/this->message_translator_);
     formatter.format(get_diagnostic_info(type), diag);
   }
 
@@ -154,6 +158,7 @@ class VSCode_Diag_Reporter final : public Diag_Reporter {
   ::Napi::Array diagnostics_;
   const LSP_Locator* locator_;
   ::Napi::Value document_uri_;
+  Translator message_translator_;
 };
 }