fix(cache): fix event handler integrity hash generation

[yassilah]

🔗 Linked issue

In reference to: #1813 (comment)

❓ Type of change

• 📖 Documentation (updates to the documentation, readme, or JSdoc annotations)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

This PR resolves an issue when setting cache integrity as an array.

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

[yassilah]

Thanks for PR dear @yassilah. I will have to locally verify your reproduction from #1812. In the meantime, if there is another fix for integrity, feel free to split it into new PR for better changelog.

Actually, taking a look at #1791 you're referencing, I don't think the change I made has any effect:
https://github.com/unjs/nitro/blob/ae253596a847f764e275f7e0450ffdfcdcd8957e/src/runtime/cache.ts#L54

You allowed the opts.integrity value to checked against entry.integrity, which is still the case in #1813. However, the issue came from this line, which makes opts.integrity an array:
https://github.com/unjs/nitro/blob/ae253596a847f764e275f7e0450ffdfcdcd8957e/src/runtime/cache.ts#L257

And that will necessarily fail here, since entry.integrity can only be a string:
https://github.com/unjs/nitro/blob/ae253596a847f764e275f7e0450ffdfcdcd8957e/src/runtime/cache.ts#L78

So, actually this PR should fix a potential regression introduced by #1791

[codecov]

Codecov Report

Merging #1820 (5a175a8) into main (c4c0046) will not change coverage.
The diff coverage is 0.00%.

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##             main    #1820   +/-   ##
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  Coverage   52.36%   52.36%           
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  Files         170      170           
  Lines       11775    11775           
  Branches      907      907           
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  Hits         6166     6166           
  Misses       5513     5513           
  Partials       96       96           

Files	Coverage Δ
src/runtime/cache.ts	0.00% <0.00%> (ø)