SSR cannot generate preload scripts of assets (by ssrContext.renderResourceHints()

[clarkdo]

Version

14.2.1

Reproduction link

https://github.com/nuxt/nuxt.js/blob/feat/webpack4/test/with-config.test.js#L46-L53

Steps to reproduce

Try to get preload scripts of assets in SSR resources hints by calling ssrContext.renderResourceHints()

What is expected?

Preload scripts of assets can generate successfully

What is actually happening?

Preload scripts of assets are empty

---

Currently we are working on the upgrading to Webpack4 in Nuxt, we met this issue in SSR font-preloading.

After some investigations, I found the issue was caused by two reasons.

1. Webpack module assets is null, I have opened a pr fix: module assets is in buildInfo webpack/webpack#6640 (merged)

2. Webpack ConcatenatedModule has changed module identifier to request additional hash, but vue-loader is still using request.

   • ConcatenatedModule identifier

   • SSR plugin is using identifier which has been modified by ConcatenatedModule

   • vue-loader is using request

I'm not very sure the fix should be done in vue-ssr or vue-loader, so just opened issue here, we can have a discussion and figure out the solution 😸