Send Hydrogen version in requests to Storefront API

[frandiox]

We do this in H1 so I'm adding the same behavior here.

However, a somewhat related problem is that this LIB_VERSION is updated after the package is built. Therefore, I think a newly released package always contains the version from the previous release.
It's been like this since H1, where we modified the "source" instead of the "dist".

Any ideas on how to fix that? We could modify the generated bundle but it doesn't feel right. Could we run changeset version before npm run build? Or would that problematic?

[jplhomer]

@frandiox the difference is that we used prepack scripts to build each individual package in Hydrogen v1: https://github.com/Shopify/hydrogen-v1/blob/95543dc81df986e20c40419e4ed7104e0b2436d3/packages/hydrogen/package.json#L67

I remember trying this right when we started v2, and we had all sorts of TS/dependency issues, so I gave up 🙃 I hadn't considered the LIB_VERSION constant being out of date by the time we needed it.

Could we try adding "prepack": "npm run build", to each of our released project scripts to ensure a fresh build happens right before being packed up to NPM?

[jplhomer]

I just pushed up a commit to do prepack. YOLO we'll see if it works next time!!!