fix: add compatibility with Vite Environment API promoted to v8

[pawelblaszczyk5]

Fixes #170

Description

Currently, in code the flag that's being checked is unstable_viteEnvironmentApi, however in one of recent RR updates it got promoted to v8_viteEnvironmentApi. This made it mandatory to rename the field in config when upgrading version, which caused the plugin to not work properly. This PR fixes this, while still providing compatibility with the previous version.

Type of change

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• Algorithm update - updates algorithm documentation/questions/answers etc.
• Other (please describe):

How Has This Been Tested?

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• Integration tests
• Unit tests
• Manual tests
• No tests required

I patched the version locally to make sure that's what causing issues with deploy and then decided to upstream the fix 😄

Reviewer checklist

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• Check if the UI is working as expected and is satisfactory
• Check if the code is well documented
• Check if the behavior is what is expected
• Check if the code is well tested
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Questions (if appropriate):

[pawelblaszczyk5]

I wasn't sure whether you'd prefer casting or ts-expect-error here. Currently in dependencies there's a version before this being promoted to v8. However, one of this will always error. I guess the back-compat could be removed shortly in the future, as environment API support was marked as experimental?

[pkg-pr-new]

Open in StackBlitz

pnpm add https://pkg.pr.new/rphlmr/react-router-hono-server@171

commit: 4cda406

[rphlmr]

👋 thanks! I’ve launched the CI so you can test the preview package.
I will take a deeper look but I’m ok to have a breaking change that requires at minimum a given React Router version

[pawelblaszczyk5]

Thanks a lot! If you prefer I can update this to use only the new flag name. I thought that the compatibility isn't too much hassle and doesn't complicate too much so it may be worth. So up to you - lmk when you have a moment to take a look

[rphlmr]

LGTM