Webpack Packing Compressed ES6 file error UGLIFYJS + unexpected token punc«(», expected punc«:»

Webpack packing compression ES6 JS react error:

Upgrade to Babel6.

ERROR In/scripts/test/test.bundle.js from Uglifyjs
Unexpected token punc? (?, expected Punc?:?) [/scripts/test/test.bundle.js:22901,

Solution:

babel-preset-es2015

NPM Install babel-preset-es2015--save

Configure Babel

Loader configuration loaders: [{test:/\.jsx$/, Loader: ' Babel-loader ', query: {presets: [' react ', ' es2015 ']}}

Reference Link: Webpack Packing compressed ES6 file error

Webpack Packing Compressed ES6 file error UGLIFYJS + unexpected token punc«(», expected punc«:»