parse error on let =

[ppetree]

The source code is:

  // This is the "report" button
  $("#errReport").on("tap", function(){
    let page = $('#errReport').data('page'); //getter
    report404(page);
  });

uglifyjs is failing on this line
let page = $('#errReport').data('page'); //getter
^
ERROR: Unexpected token: name «page», expected: punc «;»

[srod]

You have to use uglify-es to compress es2015+

https://node-minify.2clics.net/compressors/uglify-es.html