chore: update react-email from v5 to v6.1.4

[dielduarte]

Summary

• Replace @react-email/render optional peer dependency with react-email v6.1.4
• Update dynamic imports and mocks from @react-email/render → react-email

Closes DEV-503

---

Summary by cubic

Upgrade to react-email v6.1.4 and replace the optional peer @react-email/render, updating dynamic imports, tests, and error messages. Aligns resend-node with DEV-503 by using the unified react-email API.

• Migration
  • Install react-email v6+ in your project.
  • Remove @react-email/render if it was installed.

^{Written for commit 61c31d3. Summary will update on new commits.}

[cubic-dev-ai]

cubic analysis

1 issue found across 4 files

Confidence score: 2/5

• There is a high-confidence regression risk in src/templates/templates.ts: react-email v6 no longer exports renderAsync, so destructuring it will produce undefined and likely break template rendering at runtime.
• The issue is user-impacting and fairly concrete (severity 8/10, confidence 9/10), which pushes this below a safe-to-merge level until the API usage is updated to render.
• Pay close attention to src/templates/templates.ts - replace deprecated renderAsync usage with the current async render export to avoid runtime failures.

Prompt for AI agents (unresolved issues)

Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.


<file name="src/templates/templates.ts">

<violation number="1" location="src/templates/templates.ts:57">
P1: `react-email` v6 removed the deprecated `renderAsync` export (via `@react-email/render` v2.0.0) and now exports `render`, which is always async. Destructuring `renderAsync` from the `react-email` module returns `undefined`, so `this.renderAsync` remains `undefined` after the import and `await this.renderAsync(...)` will throw a `TypeError` at runtime.</violation>
</file>

Linked issue analysis

Linked issue: DEV-503: Update: resend-node

Status	Acceptance criteria	Notes
✅	Update package.json to replace peer dependency '@react-email/render' with 'react-email' (including peerDependenciesMeta optional flag)	package.json diff replaces @react-email/render with react-email and marks react-email as optional in peerDependenciesMeta.
✅	Update dynamic import and type usage in src/render.ts to import from 'react-email' and update error message	src/render.ts now imports render from 'react-email' and the thrown error message references `react-email`.
✅	Update dynamic import in src/templates/templates.ts to import renderAsync from 'react-email' and update error message	src/templates/templates.ts now dynamically imports renderAsync from 'react-email' and the error message was updated to mention `react-email`.
✅	Update tests/mocks to mock 'react-email' instead of '@react-email/render'	templates.spec.ts changes vi.mock('@react-email/render'...) to vi.mock('react-email'...), updating the test mock target.

_{Reply with feedback, questions, or to request a fix. Tag @cubic-dev-ai to re-run a review.}

[cubic-dev-ai]

P1: react-email v6 removed the deprecated renderAsync export (via @react-email/render v2.0.0) and now exports render, which is always async. Destructuring renderAsync from the react-email module returns undefined, so this.renderAsync remains undefined after the import and await this.renderAsync(...) will throw a TypeError at runtime.

Prompt for AI agents

Check if this issue is valid — if so, understand the root cause and fix it. At src/templates/templates.ts, line 57:

<comment>`react-email` v6 removed the deprecated `renderAsync` export (via `@react-email/render` v2.0.0) and now exports `render`, which is always async. Destructuring `renderAsync` from the `react-email` module returns `undefined`, so `this.renderAsync` remains `undefined` after the import and `await this.renderAsync(...)` will throw a `TypeError` at runtime.</comment>

<file context>
@@ -54,11 +54,11 @@ export class Templates {
       if (!this.renderAsync) {
         try {
-          const { renderAsync } = await import('@react-email/render');
+          const { renderAsync } = await import('react-email');
           this.renderAsync = renderAsync;
         } catch {
</file context>

Suggested change

	const { renderAsync } = await import('react-email');
	this.renderAsync = renderAsync;
	const { render } = await import('react-email');
	this.renderAsync = render;

[dielduarte]

pls do not review this one yet, it was supposed to be a draft pr. I will need to discuss this one with the team because react email is a peer deps here, meaning if we require the version 6, this one will need to be a major version of the sdk.