fix(minifier): initialize constant value in DCE (#12610)

Author: Boshen

crates/oxc_minifier/src/peephole/mod.rs

@@ -335,6 +335,15 @@ impl<'a> DeadCodeElimination {
 }
 
 impl<'a> Traverse<'a, MinifierState<'a>> for DeadCodeElimination {
+    fn exit_variable_declarator(
+        &mut self,
+        decl: &mut VariableDeclarator<'a>,
+        ctx: &mut TraverseCtx<'a>,
+    ) {
+        let mut ctx = Ctx::new(ctx);
+        self.inner.init_symbol_value(decl, &mut ctx);
+    }
+
     fn exit_statement(&mut self, stmt: &mut Statement<'a>, ctx: &mut TraverseCtx<'a>) {
         let mut ctx = Ctx::new(ctx);
         self.inner.remove_dead_code_exit_statement(stmt, &mut ctx);

crates/oxc_minifier/tests/peephole/dead_code_elimination.rs

@@ -140,6 +140,11 @@ fn dce_logical_expression() {
 
     test("foo = false && bar()", "foo = false");
     test("foo = true && bar()", "foo = bar()");
+
+    test(
+        "const x = 'keep'; const y = 'remove'; foo(x || y), foo(y && x)",
+        "const x = 'keep'; const y = 'remove'; foo(x), foo(x);",
+    );
 }
 
 #[test]