I am trying to reduce nextjs project's bundle sizes. There is a core-js bundle for polyfills. I want to remove this core-js from the main bundle size. It has 50KB of size.

I tried to use custom babel configuration like this:

    {
        "presets": [
            [
                "next/babel",
                {
                    "useBuiltIns": "usage",
                    "corejs": "3"
                }
            ]
        

]
}

But it didn't help.

How can I remove the corejs from a NextJS project?

Any help will be appreciated.

Thanks