can not find the source map file when use UglifyJsPlugin

gulp.task('test', function() {
    gulp.src('frontends/scripts/index.js')
        .pipe(webpack({
            plugins: [
                new webpack.webpack.optimize.UglifyJsPlugin({ minimize: true, sourceMap: true })
            ]
        }))
        .pipe(rename("index.min.js"))
        .pipe(gulp.dest('frontends/build/scripts/'));
});

The index.min.js is created and minified properly, but I can not find any source map file. And there is no //# sourceMappingURL=index.min.map at the end of index.min.js file. Considering UglifyJsPlugin does have sourceMap option, is this a bug of webpack-stream?

[bennycode]

Using webpack 2.1.0-beta.21, I needed to set sourceMap: true on webpack.optimize.UglifyJsPlugin AND devtool: 'source-map'.

So in the end my configuration looked like this:

webpack.config.js

var webpack = require('webpack');

module.exports = {
  devtool: 'source-map',
  entry: {
    filename: './build/proteus.js'
  },
  output: {
    filename: 'proteus-bundle.js',
    library: 'proteus',
    libraryTarget: 'amd',
    path: './dist'
  },
  node: {
    fs: 'empty',
    crypto: 'empty'
  },
  externals: {
    'libsodium-native': 'libsodium_native'
  },
  plugins: [
    new webpack.optimize.DedupePlugin(),
    new webpack.optimize.UglifyJsPlugin({
      compress: {warnings: false},
      output: {comments: false},
      sourceMap: true
    })
  ]
};

[kisenka]

It doesn’t work with devtool: 'cheap-module-source-map'