From 3180e68bf27fb95ff00bd24677ae7e96b3aa6c62 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Donny/=EA=B0=95=EB=8F=99=EC=9C=A4?= <kdy1997.dev@gmail.com>
Date: Mon, 28 Aug 2023 03:23:32 +0900
Subject: [PATCH] fix(es/compat): Apply transforms for explicit resource
 management (#7881)

**Related issue:**

 - Closes #7879
---
 crates/swc/src/config/mod.rs              | 9 ++++++++-
 crates/swc_ecma_parser/src/lib.rs         | 2 +-
 crates/swc_ecma_parser/src/parser/stmt.rs | 4 ++--
 3 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/crates/swc/src/config/mod.rs b/crates/swc/src/config/mod.rs
index 6b86cab03ae6..003a6c9d4125 100644
--- a/crates/swc/src/config/mod.rs
+++ b/crates/swc/src/config/mod.rs
@@ -57,7 +57,10 @@ use swc_ecma_transforms::{
     modules::{path::NodeImportResolver, rewriter::import_rewriter},
     optimization::{const_modules, json_parse, simplifier},
     pass::{noop, Optional},
-    proposals::{decorators, export_default_from, import_assertions},
+    proposals::{
+        decorators, explicit_resource_management::explicit_resource_management,
+        export_default_from, import_assertions,
+    },
     react::{self, default_pragma, default_pragma_frag},
     resolver,
     typescript::{self, TsEnumConfig, TsImportExportAssignConfig},
@@ -792,6 +795,10 @@ impl Options {
                     },
                     syntax.decorators()
                 ),
+                Optional::new(
+                    explicit_resource_management(),
+                    syntax.explicit_resource_management()
+                ),
                 // The transform strips import assertions, so it's only enabled if
                 // keep_import_assertions is false.
                 Optional::new(import_assertions(), !keep_import_assertions),
diff --git a/crates/swc_ecma_parser/src/lib.rs b/crates/swc_ecma_parser/src/lib.rs
index fe50ea65dc64..e3f25e721226 100644
--- a/crates/swc_ecma_parser/src/lib.rs
+++ b/crates/swc_ecma_parser/src/lib.rs
@@ -282,7 +282,7 @@ impl Syntax {
         }
     }
 
-    fn using_decl(&self) -> bool {
+    pub fn explicit_resource_management(&self) -> bool {
         match self {
             Syntax::Es(EsConfig { using_decl, .. }) => *using_decl,
             Syntax::Typescript(_) => true,
diff --git a/crates/swc_ecma_parser/src/parser/stmt.rs b/crates/swc_ecma_parser/src/parser/stmt.rs
index 273d447843ee..7556a81038a6 100644
--- a/crates/swc_ecma_parser/src/parser/stmt.rs
+++ b/crates/swc_ecma_parser/src/parser/stmt.rs
@@ -816,7 +816,7 @@ impl<'a, I: Tokens> Parser<I> {
             decls.push(self.parse_var_declarator(false, VarDeclKind::Var)?);
         }
 
-        if !self.syntax().using_decl() {
+        if !self.syntax().explicit_resource_management() {
             self.emit_err(span!(self, start), SyntaxError::UsingDeclNotEnabled);
         }
 
@@ -1272,7 +1272,7 @@ impl<'a, I: Tokens> Parser<I> {
         let start = cur_pos!(self);
         let init = self.include_in_expr(false).parse_for_head_prefix()?;
 
-        let is_using_decl = self.input.syntax().using_decl()
+        let is_using_decl = self.input.syntax().explicit_resource_management()
             && match *init {
                 Expr::Ident(Ident {
                     sym: js_word!("using"),