fix corner case in side_effects (#5479)

fixes #5478
2022-05-30 17:27:40 +01:00
parent 8bc03dc6c4
commit 3c9e1693d5
2 changed files with 37 additions and 0 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -8345,6 +8345,9 @@ Compressor.prototype.compress = function(node) {
                    var dropped = value.drop_side_effect_free(compressor);
                    if (dropped !== value) {
                        changed = true;
+                        if (dropped && async && !is_primitive(compressor, dropped)) {
+                            dropped = dropped.negate(compressor);
+                        }
                        node.value = dropped;
                    }
                }