Hi, we use Uglify in the aurelia-cli and are running into some issues with the latest versions of uglify-js. here is the bug report in the CLI repository.

Everything worked OK until 2.8.6 (so 2.8.5 still works fine). But starting from 2.8.6 we're getting a ReferenceError: _dec is not defined error.

I believe I managed to reproduce the issue with a smaller input file which I pushed to this repository. I ran node index.js both using 2.8.5 and 2.8.9 and the result in the output.js file is different. See the readme in the [repository](this repository) in order to compare the two.

Let me know if you need more information. Thanks!