How can we set source map target file name to a different path?

[hzsrc]

For a security purpose, we'd like to build the source map file to an different path. Like this:
/css/main.css => /src-map-files/main.css.map
As to js files, by source-map-dev-tool-plugin, we can set a filename option to resolve this:

        new webpack.SourceMapDevToolPlugin({
            filename: 'src-map-files/[filebase].map',
            append: false
        })

It is implemented in this file node_modules/webpack/lib/SourceMapDevToolPlugin.js:

    let sourceMapFile = compilation.getPath(sourceMapFilename, {
        chunk,
        filename: options.fileContext
            ? path.relative(options.fileContext, filename)
            : filename,
        query,
        basename: basename(filename),
        contentHash: createHash("md4")
            .update(sourceMapString)
            .digest("hex")
    });

I read the source code of optimize-css-assets-webpack-plugin, I found the target assets name is fixed:

    const parse = url.parse(assetName);
    const assetInfo = {
      path: parse.pathname,
      query: parse.query ? `?${parse.query}` : '',
    };
    // ......
    assets.setAsset(`${assetInfo.path}.map${assetInfo.query}`, r.map.toString());

How can we set source map target file name to a different path? Will you implement this filename option in the future?

[hzsrc]

I have just send a PR here, to resolve this by a getFileName function like this:

        new OptimizeCssPlugin({
            cssProcessorOptions: {
                map: config.build.productionSourceMap,
                append: false,
                getFileName(assetInfo) {
                    return `src-map-files/${path.basename(assetInfo.path)}.map${assetInfo.query}`
                }
            }
        })

Also we need an append option, and set to false when we don't want to load source map automaticly (just like source-map-dev-tool-plugin).

Please check.