From 04ec38dc4793bb31e9f3bbd0f43449ea4b2b0bfb Mon Sep 17 00:00:00 2001
From: camc314 <18101008+camc314@users.noreply.github.com>
Date: Mon, 6 Jan 2025 02:21:26 +0000
Subject: [PATCH] feat(minifier): remove unused arrow function expressions
 (#8262)

---
 .../src/ast_passes/peephole_remove_dead_code.rs       | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/crates/oxc_minifier/src/ast_passes/peephole_remove_dead_code.rs b/crates/oxc_minifier/src/ast_passes/peephole_remove_dead_code.rs
index 6e65a5fa6130f..29225a2a55bee 100644
--- a/crates/oxc_minifier/src/ast_passes/peephole_remove_dead_code.rs
+++ b/crates/oxc_minifier/src/ast_passes/peephole_remove_dead_code.rs
@@ -310,6 +310,7 @@ impl<'a, 'b> PeepholeRemoveDeadCode {
                 Expression::FunctionExpression(function_expr) if function_expr.id.is_none() => {
                     Some(ctx.ast.statement_empty(SPAN))
                 }
+                Expression::ArrowFunctionExpression(_) => Some(ctx.ast.statement_empty(SPAN)),
                 // `typeof x` -> ``
                 Expression::UnaryExpression(unary_expr)
                     if unary_expr.operator.is_typeof()
@@ -583,4 +584,14 @@ mod test {
         fold_same("delete x.y");
         fold_same("delete x.y.z()");
     }
+
+    #[test]
+    fn test_fold_function() {
+        fold("() => {}", "");
+        fold_same("var k = () => {}");
+        fold_same("var k = function () {}");
+        // TODO: fold the following...
+        fold_same("(() => {})()");
+        fold_same("(function () {})()");
+    }
 }