Image optimization process

[sas-news]

Add a downloadPoster prop to YouTube and Vimeo and LinkPreview components.
Download images at build time, using getImage().

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[delucis]

Thank you for the PR @sas-news! I also considered if this might be something worth exploring.

Thinking about this from the big picture, I don’t love requiring a prop to control something that in theory could be a sensible default. Especially when the prop doesn’t work without extra configuration — it’s almost always a nicer API if you only have one place to check to make sure it’s configured correctly.

I think what might make sense is:

1. Always use getImage() under the hood. If the remote URL is not authorized, inferSize still works, even if no optimization happens. (One case to double check would be using a non-absolute URL, e.g. if someone has an image in public/, e.g. poster="/example.jpg" should continue to work.)
2. Document the optimization available by adding to image.domains in astro.config.mjs
3. (optional) Maybe services with predictable image URLs can export an array people can spread into their config if they want

I think that would match the likely use case that people want the download behaviour consistently for their whole site, not on a component-by-component basis.

What do you think?

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P.S. There might also be some follow-up opportunities here. For example, often the OG images are much larger than needed (1200px wide), so if we’re using getImage() with an authorized domain, there’s also the opportunity to resize it to a more appropriate size.

[sas-news]

Correction of image optimization process

• For LinkPreview component, use Image component for image optimization
• For YouTube and Vimeo components, use getImage() for image optimization
• Do not perform optimization for unauthorized remote URLs
• Document that optimization can be enabled by configuring image.domains in astro.config.mjs
• Deprecate downloadPoster prop as it is no longer needed

This allows local images to work correctly out of the box, while still providing the ability to opt-in to optimization for approved remote domains. LinkPreview component now benefits from the built-in optimization capabilities using astro:assets, while YouTube and Vimeo components use getImage() for optimization.