UglifyJS error because of ES6 about dropkick

[NordlingDev]

I've tried the builtin UglifyJS in the latest Webpack. I also tried the beta version of latest UglifyJS 3 (which uses Harmony). It got past the error, but instead I have mangling issues which probably relates to how Uglify handles mangling of node_modules folder (mangle: false seems to ignore node_modules folder).

[mladimatija]

I am getting this error as well, using DropKick in congregation with roots' Sage 9 beta 4.

ERROR Failed to compile with 1 errors scripts/main_678f8f2f.js from UglifyJs Unexpected token: name (_docListener) [scripts/main_678f8f2f.js:3142,4]

[Robdel12]

Ah crap. It's because uglify 2.x and below can't handle ES6 classes. So there are two options here:

• Upgrade to uglify 3
• Transpile the DK class before going through uglify (exclude: /node_modules\/(?!(dropkickjs)\/).*/)

Honestly neither of those are awesome and I didn't know consuming projects would have to explicitly include this module in their transpilation... Changes will have to be made.

[Robdel12]

Interesting. Are you using the already minified version in your project or importing the module?

[NordlingDev]

@Robdel12 - I'm importing from NPM. Every other node modules can be bundled together with UglifyJS, just not DropKick.

[Robdel12]

What version of webpack and uglify? I use uglify to compile the built version

[NordlingDev]

@Robdel12 - I'll stay with a min.js file in the meanwhile. Just to keep things simple. Thank you for getting into it!

[mladimatija]

@Robdel12 I ended up excluding the dropkick class, should be good as a temp fix. Thanks for the solution!