Support for Yarn 2 PnP

[jakubzitny]

In Yarn 2 PnP mode, there is no node_modules folder. Everything is in .yarn cache and kept loaded in memory. Would it be possible to add support for this in webpack-node-externals or have you already thought about it?

[tarikjn]

Bumping this up. I expected webpack-node-externals to just work with PnP and it took me a while to find that this was my issue.

I found two packages that implement this:

• https://github.com/jonhartnett/webpack-pnp-externals (looks more complete/correct)
• https://github.com/tonyfromundefined/pnp-node-externals

At first glance it seems that this could be handled by another package than webpack-node-externals, but ideally webpack-node-externals, or a higher-level package should handle package manager context automatically, the rationales are:

• this package is called webpack-node-externals, not webpack-npm-externals
• standardized options
• most importantly: to avoid having the package manager setup leak into webpack configs