rome · ematipico · Aug 8, 2023 · Aug 8, 2023
diff --git a/crates/rome_js_analyze/src/analyzers/style/use_single_var_declarator.rs b/crates/rome_js_analyze/src/analyzers/style/use_single_var_declarator.rs
@@ -37,6 +37,7 @@ declare_rule! {
 impl Rule for UseSingleVarDeclarator {
     type Query = Ast<JsVariableStatement>;
     type State = (
+        Option<JsSyntaxToken>,
         JsSyntaxToken,
         JsVariableDeclaratorList,
         Option<JsSyntaxToken>,
@@ -53,7 +54,7 @@ impl Rule for UseSingleVarDeclarator {
         } = node.as_fields();
 
         let JsVariableDeclarationFields {
-            await_token: _,
+            await_token,
             kind,
             declarators,
         } = declaration.ok()?.as_fields();
@@ -64,7 +65,7 @@ impl Rule for UseSingleVarDeclarator {
             return None;
         }
 
-        Some((kind, declarators, semicolon_token))
+        Some((await_token, kind, declarators, semicolon_token))
     }
 
     fn diagnostic(ctx: &RuleContext<Self>, _state: &Self::State) -> Option<RuleDiagnostic> {
@@ -87,7 +88,7 @@ impl Rule for UseSingleVarDeclarator {
             return None;
         }
 
-        let (kind, declarators, semicolon_token) = state;
+        let (await_token, kind, declarators, semicolon_token) = state;
 
         let index = prev_parent
             .children()
@@ -198,14 +199,18 @@ impl Rule for UseSingleVarDeclarator {
                         )
                     };
 
-                    let mut builder = make::js_variable_statement(
-                        make::js_variable_declaration(
-                            kind,
-                            make::js_variable_declarator_list([declarator], []),
-                        )
-                        .build(),
+                    let mut variable_declaration = make::js_variable_declaration(
+                        kind,
+                        make::js_variable_declarator_list([declarator], []),
                     );
 
+                    if let Some(await_token) = await_token {
+                        variable_declaration =
+                            variable_declaration.with_await_token(await_token.clone());
+                    }
+
+                    let mut builder = make::js_variable_statement(variable_declaration.build());
+
                     let semicolon_token = if index + 1 == declarators_len {
                         last_semicolon_token
                     } else {

diff --git a/crates/rome_js_analyze/src/semantic_analyzers/nursery/use_naming_convention.rs b/crates/rome_js_analyze/src/semantic_analyzers/nursery/use_naming_convention.rs
@@ -607,6 +607,7 @@ enum Named {
     LocalConst,
     LocalLet,
     LocalVar,
+    LocalUsing,
     Namespace,
     ObjectGetter,
     ObjectMethod,
@@ -828,9 +829,11 @@ impl Named {
             (JsVariableKind::Const, false) => Named::LocalConst,
             (JsVariableKind::Let, false) => Named::LocalLet,
             (JsVariableKind::Var, false) => Named::LocalVar,
+            (JsVariableKind::Using, false) => Named::LocalUsing,
             (JsVariableKind::Const, true) => Named::TopLevelConst,
             (JsVariableKind::Let, true) => Named::TopLevelLet,
             (JsVariableKind::Var, true) => Named::TopLevelVar,
+            (JsVariableKind::Using, true) => Named::LocalUsing,
         })
     }
 
@@ -881,6 +884,7 @@ impl Named {
             | Named::LocalConst
             | Named::LocalLet
             | Named::LocalVar
+            | Named::LocalUsing
             | Named::ObjectGetter
             | Named::ObjectMethod
             | Named::ObjectProperty
@@ -938,6 +942,7 @@ impl std::fmt::Display for Named {
             Named::LocalConst => "local const",
             Named::LocalLet => "local let",
             Named::LocalVar => "local var",
+            Named::LocalUsing => "local using",
             Named::Namespace => "namespace",
             Named::ObjectGetter => "object getter",
             Named::ObjectMethod => "object method",

diff --git a/crates/rome_js_formatter/src/js/declarations/for_variable_declaration.rs b/crates/rome_js_formatter/src/js/declarations/for_variable_declaration.rs
@@ -16,25 +16,16 @@ impl FormatNodeRule<JsForVariableDeclaration> for FormatJsForVariableDeclaration
         } = node.as_fields();
 
         if let Some(await_token) = await_token {
-            write![
-                f,
-                [group(&format_args![
-                    await_token.format(),
-                    space(),
-                    kind_token.format(),
-                    space(),
-                    declarator.format()
-                ])]
-            ]
-        } else {
-            write![
-                f,
-                [group(&format_args![
-                    kind_token.format(),
-                    space(),
-                    declarator.format()
-                ])]
-            ]
+            write!(f, [await_token.format(), space()])?;
         }
+
+        write![
+            f,
+            [group(&format_args![
+                kind_token.format(),
+                space(),
+                declarator.format()
+            ])]
+        ]
     }
 }
diff --git a/crates/rome_js_formatter/src/js/declarations/variable_declaration.rs b/crates/rome_js_formatter/src/js/declarations/variable_declaration.rs
@@ -16,25 +16,16 @@ impl FormatNodeRule<JsVariableDeclaration> for FormatJsVariableDeclaration {
         } = node.as_fields();
 
         if let Some(await_token) = await_token {
-            write![
-                f,
-                [group(&format_args![
-                    await_token.format(),
-                    space(),
-                    kind.format(),
-                    space(),
-                    declarators.format()
-                ])]
-            ]
-        } else {
-            write![
-                f,
-                [group(&format_args![
-                    kind.format(),
-                    space(),
-                    declarators.format()
-                ])]
-            ]
+            write!(f, [await_token.format(), space()])?;
         }
+
+        write![
+            f,
+            [group(&format_args![
+                kind.format(),
+                space(),
+                declarators.format()
+            ])]
+        ]
     }
 }
diff --git a/crates/rome_js_syntax/src/stmt_ext.rs b/crates/rome_js_syntax/src/stmt_ext.rs
@@ -35,6 +35,7 @@ pub enum JsVariableKind {
     Const,
     Let,
     Var,
+    Using,
 }
 
 impl JsVariableDeclaration {
@@ -60,6 +61,7 @@ impl JsVariableDeclaration {
             T![const] => JsVariableKind::Const,
             T![let] => JsVariableKind::Let,
             T![var] => JsVariableKind::Var,
+            T![using] => JsVariableKind::Using,
             _ => unreachable!(),
         })
     }
@@ -88,6 +90,7 @@ impl JsForVariableDeclaration {
             T![const] => JsVariableKind::Const,
             T![let] => JsVariableKind::Let,
             T![var] => JsVariableKind::Var,
+            T![using] => JsVariableKind::Using,
             _ => unreachable!(),
         })
     }
@@ -98,21 +101,6 @@ declare_node_union! {
 }
 
 impl AnyJsVariableDeclaration {
-    /// Whether the declaration is a const declaration
-    pub fn is_const(&self) -> bool {
-        self.variable_kind() == Ok(JsVariableKind::Const)
-    }
-
-    /// Whether the declaration is a let declaration
-    pub fn is_let(&self) -> bool {
-        self.variable_kind() == Ok(JsVariableKind::Let)
-    }
-
-    /// Whether the declaration is a var declaration
-    pub fn is_var(&self) -> bool {
-        self.variable_kind() == Ok(JsVariableKind::Var)
-    }
-
     pub fn variable_kind(&self) -> SyntaxResult<JsVariableKind> {
         match self {
             AnyJsVariableDeclaration::JsForVariableDeclaration(decl) => decl.variable_kind(),