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sharp
High performance Node.js image processing, the fastest module to resize JPEG, PNG, WebP, AVIF and TIFF images. Uses the libvips library.
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
You can read the release note here https://github.com/immich-app/immich/releases/tag/v1.41.0_64-dev
For 1, and 2, the possibility is there. If https://sharp.pixelplumbing.com/ support it, we can convert the file to those formats. It can be a setting from the user to set which format of the generated thumbnail files to be stored as