mix.js('resources/assets/js/app.js', 'public/js')
.js('resources/assets/js2/app2.js', 'public/js/app2.js')
.sass('resources/assets/scss/app.scss', 'public/css')
.sass('resources/assets/scss/style.scss', 'public/css')
.sass('resources/assets/scss2/app.scss', 'public/css2')
.sass('resources/assets/scss2/style.scss', 'public/css2')
.sourceMaps();
js のみソースマップが作られ scss のソースマップが出ないとき…
mix.webpackConfig({ devtool: "inline-source-map" });
上記を webpack.mix.js に追加
参考：
