Delete old chunk files

delete-old-chunk-files.js

plugins: [
        function () {
            var distPath = "./dist";
            this.plugin("done", function (stats) {
                var finalFile = stats.toJson().assetsByChunkName.main;
                fs.readdirSync(distPath).forEach(function (filename) {
                    if (filename !== finalFile) {
                        fs.unlinkSync(distPath + filename);
                    }
                })
            })
        }
    ]