Webpack Packing Error unexpected token

The latest project to go live, the project needs to be packaged to deploy to the server, in the packaging process NPM run build following error unexpected Token:punc (() [./~/[email protected] @element-ui/ PACKAGES/COL/SRC/COL.JS:23,0][STATIC/JS/0.3FBE30ED5A683F62D6BC.JS:13890,10]

It literally means that the error came from Uglifyjs, and the Unexpected ' (', open col.js file View in the Col.js 23 line)

Do not recognize the parentheses of this function, the Internet query after the original is UGLIFYJS can not parse ES6 problem, element-ui under the col file using the ES6 syntax, so the resolution is not resolved, the solution is in the packaging, let Babel to parse the failed package, Open Webpack.base.conf.js, can be configured as follows

Then build it again and you're done.

Webpack Packing Error unexpected token