Dynamic image generation for React Email

[dielduarte]

Goals

Explore APIs dynamic image generation for React Email

Background

The idea

A first-class way to render dynamic visuals in React Email as images. If we
can render JSX/HTML+CSS to an image, one primitive covers barcodes, QR codes,
charts, and more. Likely path: satori for
HTML/CSS → SVG, then SVG → PNG (SVG has poor email-client support).

The hard part: the API

Rendering is the easy part. The real challenge is how the user gets the image:

• Where is it hosted? (export to a CDN and reference by URL?)
• How does it work in React Server Components vs. plain Node? Supporting both
  cleanly is the crux.
• What's the ergonomic surface — component, render helper, build step?

Questions

1. Is image-based generation the right direction (vs. HTML components like feat: add barcode component for email-safe HTML table barcodes #2960)?
2. What should the API — especially the hosting/URL story — look like?
3. Scope: barcodes/QR/charts first, or a general "render-to-image" primitive?

We'll likely close #2960 in favor of settling this first.

Proposal

We don't have a proposal yet, we will use this discussion to explore.