Make a fallback view for when URL resolution fails or times out

[zetlen]

This issue is a:

[ ] Bug
[x] Feature suggestion
[ ] Other

Description:

If GraphQL isn't working, or returns null for the MagentoRouter URL resolution call, then the Loading screen displays forever. It should switch to an error.

Environment and steps to reproduce

OS: Any

Magento 2 version: Any

Other environment information:

Steps to reproduce:

1. Configure a PWA with Peregrine, Buildpack, and a Magento 2 store.
2. Launch the development server with npm start.
3. Navigate to a known-nonexistent URL.
4. Observe the loading screen stays forever.

Expected result:

Loading screen is replaced with an informative error screen.

Possible solutions:

• Response to specific GraphQL states
• Variant of Loading screen
• Specified timeout

Additional information:

• Consider developer mode and production mode versions of this

[PWAStudioBot]

This issue was moved to magento/pwa-studio#13