You can cut down the duplicate config with webpack-merge package. I start with a common config object that defines loaders, aliases, etc. and it gets imported by my frontend/backend/cronjob/worker targets that simply describe the entry/outputs

I also recommend installing ts-node and writing your configs in Typescript to avoid typos

Here's an old side project of mine that has 3 targets [1]. I personally don't think it's that complex but it does have hundreds of lines altogether.

[1] https://github.com/Trinovantes/MAL-Cover-CSS/tree/master/bui...