I have 2 Vue-Cli webpack projects (ClientApp and Lib).
Lib is my components library (shared with other projects)

Problem

When I build my project ClientApp npm run build, I have the following error:

ERROR in static/js/app.d08a24ce0e8d0438ce68.js from UglifyJs Unexpected token: operator (>) [C:/.../Lib/src/tools/escape-key.js:3,0][static/js/app.d08a24ce0e8d0438ce68.js:17468,38] 

Questions

It seems like the error comes from an arrow function in the file escape-key.js.
This is ES6 syntax and UglifyJS can't parse this.
Shouldn't Babel go first, before Uglify?
Note that is works well with *.vue files.

Project structure

ClientApp | - build | - config | - src | - App.Vue // import EscapeKey from '~lib/tools/escape-key'; 

Lib | -src | - tools | - escape-key.js 

ClientApp's webpack.base.conf.js file

Note there is an alias to Lib.

resolve: { extensions: ['.js', '.vue', '.json'], alias: { '@': resolve('src'), '~lib': path.join(__dirname, '../../lib/src'), } }, 

Please feel free to ask for more details if required.