fix corner case in side_effects (#4541)

fixes #4540
2021-01-12 01:12:43 +00:00
parent c12486bab4
commit 1e831df1f6
2 changed files with 22 additions and 1 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -8226,7 +8226,7 @@ merge(Compressor.prototype, {
            if (compressor.option("side_effects")
                && can_drop
                && all(fn.body, is_empty)
-                && (fn !== exp || fn_name_unused(fn, compressor))
+                && (fn === exp ? fn_name_unused(fn, compressor) : !has_default && !has_destructured)
                && !(is_arrow(fn) && fn.value)) {
                return make_sequence(self, convert_args()).optimize(compressor);
            }