// welcome.js

"use strict";

function welcome(message) {
  if (NODE_ENV == "development") {
    debugger;
  }

  alert(`Welcome ${message}`);
}

export { welcome };

@@ -73,21 +73,15 @@
  == 
-%22development%22
+DEV_ENV
 ) %7B%0A
@@ -97,16 +97,53 @@
 ger;%0A  %7D
+%0A  console.log(%60Welcome $%7Bmessage%7D%60);
 %0A%0A  aler

Use DEV_ENV. Add console.log for testing UglifyJS