Plugin is not respecting the default sourcemap output

[enmanuelduran]

I'm using this config to generate the sourcemaps on my site on production:

new OptimizeCSSAssetsPlugin({
    cssProcessor: require('cssnano'),
    cssProcessorOptions: {
        map: {
            inline: false,
            annotation: true,
        },
    },
}),

and webpack output sourceMapFilename is:

output: { 
    sourceMapFilename: sourcemaps/[file].map
}

But the plugin is sending the sourcemaps to the same folder in which the css output files are located instead of sourceMapFilename using the sourcemap folder.

Without using the plugin all the sourcemaps work as expected and go to the sourceMapFilename point but when adding the plugin it just ignores it.

[galvarez421]

Perhaps related to https://github.com/NMFR/optimize-css-assets-webpack-plugin/issues/53#issuecomment-494830816, the plugin does not seem to respect general webpack configuration options related to source maps.

[galvarez421]

Related to #91.