Support HEIC image decoding in the /api/media/image proxy

[techeng322]

Summary

• Detect HEIC/HEIF buffers via ftyp brand sniffing and decode them to JPEG with heic-convert before passing to sharp.
• Wire decoding into /api/media/image (imageProxyHandler) so Arweave-hosted HEIC blur/resize URLs no longer return 500.
• Apply the same prepareImageBufferForSharp helper to OG collage thumbnails (getBase64Image).

Test plan

• pnpm test:run src/lib/media/__tests__/isHeicBuffer.test.ts
• pnpm test:run src/lib/media/__tests__/prepareImageBufferForSharp.test.ts
• pnpm test:run src/lib/media/__tests__/imageProxyHandler.heic.test.ts
• pnpm test:run src/lib/media/__tests__/imageProxyHandler.test.ts
• pnpm test:run src/lib/og/__tests__/getBase64Image.heic.test.ts
• Deploy and verify GET /api/media/image?url=ar://...&w=16&q=10&f=webp on a HEIC moment returns 200

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Project	Deployment	Actions	Updated (UTC)
in-process-api	Ready	Preview	Jul 11, 2026 5:50pm

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 676dfea0-018c-4019-856f-fba1a97ba04c

📥 Commits

Reviewing files that changed from the base of the PR and between 5a7b76e and 24d0aa1.

⛔ Files ignored due to path filters (1)

• pnpm-lock.yaml is excluded by !**/pnpm-lock.yaml

📒 Files selected for processing (12)

• package.json
• src/lib/media/__tests__/imageProxyHandler.heic.test.ts
• src/lib/media/__tests__/isHeicBuffer.test.ts
• src/lib/media/__tests__/prepareImageBufferForSharp.test.ts
• src/lib/media/decodeHeicToJpegBuffer.ts
• src/lib/media/imageProxyHandler.ts
• src/lib/media/isHeicBuffer.ts
• src/lib/media/prepareImageBufferForSharp.ts
• src/lib/media/readFtypBrands.ts
• src/lib/og/__tests__/getBase64Image.heic.test.ts
• src/lib/og/getBase64Image.ts
• src/types/heic-convert.d.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch techengme/myc-5015-support-heic-image-decoding-in-the-apimediaimage-proxy-so

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