Since cfx archived the cfx-server-data repo, and webpack 4 stuff is incompatible with webpack 5, I decided to put this here. If you looked for it - you know you need it.

Clone the repo into your resources/[system]/[builders] and run npm i or any other package manager command to install the dependencies (for some reason fxserver didn't install them for me here)

Add this to your server.cfg somewhere early, preferably next to default webpack

ensure webpack5

In YOUR RESOURCE (don't go around changing it in random resources that don't need it!), replace this:

dependencies {
    'yarn',
    'webpack'
}

webpack_config 'webpack.prod.js'

With this:

dependencies {
    'yarn',
    'webpack5'
}

webpack5_config 'webpack.prod.js'

Now your resource should be built with webpack 5.75.0