Version 2.6.0 & 2.7.0 makes UglifyJs triggers an error while building with webpack

[fmagaldea]

In "dev" mode, build is ok (no call to UglifyJs). But in "prod" mode, while building bundle with wepback, there is an error at the end of the process:

ERROR in assets-f7acaeef/bundle.js from UglifyJs
Unexpected token: punc ()) [assets-f7acaeef/bundle.js:57688,2858]

Extract of my package.json:

  "devDependencies": {
    "babel-core": "6.26.3",
    "babel-eslint": "10.0.1",
    "babel-jest": "23.6.0",
    "babel-loader": "7.1.5",
    "babel-polyfill": "6.26.0",
    "babel-preset-env": "1.7.0",
    "babel-preset-react": "6.24.1",
    "babel-preset-stage-0": "6.24.1",
    "babel-register": "6.26.0",
    "connect-history-api-fallback": "1.6.0",
    "copy-webpack-plugin": "5.0.3",
    "css-loader": "2.1.1",
    "file-loader": "3.0.1",
    "generate-json-webpack-plugin": "0.3.1",
    "html-webpack-plugin": "3.2.0",
    "imagemin-webpack-plugin": "2.4.2",
    "style-loader": "0.23.1",
    "uglifyjs-webpack-plugin": "2.1.2",
    "url-loader": "1.1.2",
    "webpack": "4.31.0",
    "webpack-cli": "3.3.2"
  }

My .babelrc:

{
  "presets": [
    "env",
    "react",
    "stage-0"
  ]
}

Works with react-countdown-clock 2.5.0 but fails with 2.6.0

[fmagaldea]

Looks like some new version of other package (webpack...) fixed this issue, so I close it.

[fmagaldea]

In fact, issue is still there.

[rxluz]

Same problem here

[fmagaldea]

Problem still there with 2.7.0 > we are stuck to version 2.5.0