From 19ba714ea11d6e733cd46ed3ce6b851ddc972e5a 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: Fri, 7 Jul 2023 13:07:13 +0900
Subject: [PATCH] fix(es/minifier): Don't drop unused properties of top-level
 vars (#7638)

**Related issue:**

 - Closes #7635.
---
 crates/swc_ecma_minifier/src/compress/optimize/unused.rs      | 4 ++++
 .../projects/wmr/archive-1/chunks/index.bf24abaa/output.js    | 1 +
 .../projects/wmr/archive-1/chunks/index.ddc4110d/output.js    | 4 +++-
 3 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/crates/swc_ecma_minifier/src/compress/optimize/unused.rs b/crates/swc_ecma_minifier/src/compress/optimize/unused.rs
index 5a4fc5f3c0a..471840b5f45 100644
--- a/crates/swc_ecma_minifier/src/compress/optimize/unused.rs
+++ b/crates/swc_ecma_minifier/src/compress/optimize/unused.rs
@@ -835,6 +835,10 @@ impl Optimizer<'_> {
             return None;
         }
 
+        if self.ctx.top_level && !self.options.top_level() {
+            return None;
+        }
+
         let name = v.name.as_ident()?;
         let obj = v.init.as_mut()?.as_mut_object()?;
 
diff --git a/crates/swc_ecma_minifier/tests/fixture/projects/wmr/archive-1/chunks/index.bf24abaa/output.js b/crates/swc_ecma_minifier/tests/fixture/projects/wmr/archive-1/chunks/index.bf24abaa/output.js
index 681b933a2c3..cc328c54e95 100644
--- a/crates/swc_ecma_minifier/tests/fixture/projects/wmr/archive-1/chunks/index.bf24abaa/output.js
+++ b/crates/swc_ecma_minifier/tests/fixture/projects/wmr/archive-1/chunks/index.bf24abaa/output.js
@@ -1,5 +1,6 @@
 import { s as style, m } from "../index.f66dda46.js";
 const process = {
+    browser: !0,
     env: {
         FOO: "bar",
         OVERRIDE: "11",
diff --git a/crates/swc_ecma_minifier/tests/fixture/projects/wmr/archive-1/chunks/index.ddc4110d/output.js b/crates/swc_ecma_minifier/tests/fixture/projects/wmr/archive-1/chunks/index.ddc4110d/output.js
index 06d6f41b420..df7ca9b29f7 100644
--- a/crates/swc_ecma_minifier/tests/fixture/projects/wmr/archive-1/chunks/index.ddc4110d/output.js
+++ b/crates/swc_ecma_minifier/tests/fixture/projects/wmr/archive-1/chunks/index.ddc4110d/output.js
@@ -1,5 +1,7 @@
 import { s as style, y, m } from "../index.f66dda46.js";
-const styles = {};
+const styles = {
+    about: "about_migxty"
+};
 function About({ query, title }) {
     return y(()=>(console.log("Mounted About: ", title), ()=>{
             console.log("Unmounting About: ", title);