License info being included twice after Webpack 4 build

[bruffstar]

Webpack 4 still uses uglifyjs-webpack-plugin if mode: "production" right?

If so... see problem here...

Not sure if this is a Webpack/uglifyjs issue or an issue with the package that has the duplicate license info showing. (I have also opened an issue with them to investigate).

In the bundled file, no other third party scripts are adding the license info twice.

I thought it was maybe because the "classnames" package has license info in index.js, bind.js & dedupe.js. However, I ruled this out after adding a test change in the copyright text in only index.js and the change was showing on both license comments in the bundle.

Webpack: v4.8.3
NPM: v5.6.0
Node: v8.1.1

webpack.config.js

const ExtractTextPlugin = require('extract-text-webpack-plugin');

module.exports = {
    mode: 'production',
    devtool: "source-maps",
    entry: "./src/js/index.tsx",
    output: {
        path: __dirname + "/dist",
        filename: "js/bundle.min.js"
    },
    resolve: {
        extensions: [".ts", ".tsx", ".js", ".json"]
    },
    module: {
        rules: [
            {
                test: /\.(ts|tsx)$/,
                use: [
                    {
                        loader: 'ts-loader'
                    }
                ]
            },
            {
                test: /\.scss$/,
                use: ExtractTextPlugin.extract({
                    use: [{
                        loader: 'css-loader',
                    }, {
                        loader: 'sass-loader'
                    }],
                    fallback: 'style-loader'
                })
            }
        ]
    },
    plugins: [
        new ExtractTextPlugin({
            filename: 'css/bundle.min.css',
            allChunks: true,
        })
    ],
    externals: {
        "react": "React",
        "react-dom": "ReactDOM"
    },
};

[bruffstar]

I have made a super simple example here: https://github.com/bruffstar/bug-test

See dist/index.js for an exmaple output with the duplicate license comment.

[alexander-akait]

@bruffstar thanks i will looks what is wrong and what we can do with duplicate licenses

[tsangint]

Did this resolved？

[alexander-akait]

@tsangint no problem in uglify-es, we can't do here anything, sorry

[stevenvachon]

Duplicate of #158

[alexander-akait]

@stevenvachon not quite, it will be bug in uglify-es