fix corner case in comparisons (#4680)

fixes #4679
2021-02-24 13:38:44 +00:00
parent c885660347
commit a5a958beda
2 changed files with 21 additions and 0 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -3618,6 +3618,8 @@ merge(Compressor.prototype, {
                return this.left.is_defined(compressor) && this.right.is_defined(compressor);
              case "||":
                return this.left.is_truthy() || this.right.is_defined(compressor);
+              case "??":
+                return this.left.is_defined(compressor) || this.right.is_defined(compressor);
              default:
                return true;
            }