Fix optimization tests

crates/swc_ecma_transforms_optimization/src/simplify/expr/tests.rs

@@ -974,15 +974,15 @@ fn test_fold_comparison4() {
 
 #[test]
 fn test_fold_get_elem1() {
-    fold("x = [,10][0]", "x = void 0;");
-    fold("x = [10, 20][0]", "x = 10;");
-    fold("x = [10, 20][1]", "x = 20;");
+    fold("x = [,10][0]", "x = (0, void 0);");
+    fold("x = [10, 20][0]", "x = (0, 10);");
+    fold("x = [10, 20][1]", "x = (0, 20);");
 
     // fold("x = [10, 20][-1]", "x = void 0;");
     // fold("x = [10, 20][2]", "x = void 0;");
 
     fold("x = [foo(), 0][1]", "x = (foo(), 0);");
-    fold("x = [0, foo()][1]", "x = foo();");
+    fold("x = [0, foo()][1]", "x = (0, foo());");
     // fold("x = [0, foo()][0]", "x = (foo(), 0)");
     fold_same("for([1][0] in {});");
 }
@@ -1005,11 +1005,11 @@ fn test_fold_get_elem2_2() {
 
 #[test]
 fn test_fold_array_lit_spread_get_elem() {
-    fold("x = [...[0    ]][0]", "x = 0;");
-    fold("x = [0, 1, ...[2, 3, 4]][3]", "x = 3;");
-    fold("x = [...[0, 1], 2, ...[3, 4]][3]", "x = 3;");
-    fold("x = [...[...[0, 1], 2, 3], 4][0]", "x = 0;");
-    fold("x = [...[...[0, 1], 2, 3], 4][3]", "x = 3;");
+    fold("x = [...[0    ]][0]", "x = (0, 0);");
+    fold("x = [0, 1, ...[2, 3, 4]][3]", "x = (0, 3);");
+    fold("x = [...[0, 1], 2, ...[3, 4]][3]", "x = (0, 3);");
+    fold("x = [...[...[0, 1], 2, 3], 4][0]", "x = (0, 0);");
+    fold("x = [...[...[0, 1], 2, 3], 4][3]", "x = (0, 3);");
     // fold("x = [...[]][100]", "x = void 0;");
     // fold("x = [...[0]][100]", "x = void 0;");
 }
@@ -1594,7 +1594,7 @@ fn test_issue8747() {
 
     // Index with an expression.
     fold("'a'[0 + []]", "\"a\";");
-    fold("[1][0 + []]", "1");
+    fold("[1][0 + []]", "0, 1;");
 
     // Don't replace if side effects exist.
     fold_same("[f(), f()][0]");