Lots of warnings printed when using Vite

[Artur-]

Description of the bug

There seems to be three types of warnings printed when starting a project using Vite for the first time:

1. [vite] Failed to load source map for /@fs/.../target/flow-frontend/VaadinDevmodeGizmo.js. (Fixed)
2. @vaadin/accordion is incorrectly packaged. Please contact the package author to fix. (Fixed)
3. [vite] Failed to load source map for /@fs/.../node_modules/.vite/chunk-HYXO6NXE.js?v=7f5865f8.

While all of the warnings are harmless we still need to fix them

1. By adding a source map or fixing Vite so it doesn't try to load a source map that doesn't exist
2. By fixing package.json in our components and potentially ignore the warning for @polymer/*
3. Figuring out where the timing issue comes from as it is about the browser trying to load "one more file" after Vite has said "stop loading and refresh"

[vursen]

@vaadin/accordion is incorrectly packaged. Please contact the package author to fix.

This kind of warnings is produced by SSR-analysis performed by Vite when a missing dependency is discovered.

We don't use SSR so I reported this in a Vite issue that no SSR-related work should take place when the config.ssr is undefined = the SSR feature is disabled.

[vursen]

[vite] Failed to load source map for /@fs/.../node_modules/.vite/chunk-HYXO6NXE.js?v=7f5865f8.

This kind of warnings is shown because of a race condition that sometimes occurs when the pre-bundling process begins at nearly the same time as an HTTP request to the previously pre-bundled dependency.

Reported this in a Vite issue.

[vursen]

This kind of warnings is shown because of a race condition that sometimes occurs when the pre-bundling process begins at nearly the same time as an HTTP request to the previously pre-bundled dependency.

Let's wait for vitejs/vite#6758 to get merged as it will fix the race condition and hence warnings:

[vite] Failed to load source map for /@fs/.../node_modules/.vite/chunk-HYXO6NXE.js?v=7f5865f8.

[vaadin-bot]

This ticket/PR has been released with Vaadin 23.1.0.alpha1 and is also targeting the upcoming stable 23.1.0 version.