Error in webpack

I had a problem with webpack.

I successfully translated scss into css, it works.
But there was tiny problem with file's name.

I expect..
➜ wetube/static/styles.css
➜ wetube/static/main.js

But I got..
➜ wetube/static/main.css
➜ wetube/static/main.js

So I googled this problem, I changed some part of webpack.config.js.

➜Before: 

plugins: [

new MiniCssExtractPlugin({

moduleFilename: ({ name }) => `${name.replace("/css/")}.css`

})

]

➜After: 

plugins: [

new MiniCssExtractPlugin({

filename: "styles.css"

})

]

➜This is my github page: 
https://github.com/humonnom/wetube.git