feat(render): e2e test for vite and nextjs

[gabrielmfern]

This PR adds in a new directory and test file, following the same lines of what we already have with Tailwind. The biggest difference is that the test this PR adds also tests things from the browser with playwright and tries to ensure they don't error during render.

It currently tests with the following:

• vite in the browser
• nextjs in the browser
• nextjs in a node api route
• nextjs in a edge api route

Where all of them are ran both in dev and in production to make sure it works the same

The test CI is failing exactly because there are two current issues with render, #1630 and #1953. Closes DEV-22

[changeset-bot]

🦋 Changeset detected

Latest commit: 45bbb38

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@react-email/render	Patch

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Project	Deployment	Actions	Updated (UTC)
react-email	Ready	Preview, Comment	May 8, 2026 9:29pm
react-email-demo	Ready	Preview, Comment	May 8, 2026 9:29pm

[cubic-dev-ai]

1 issue found across 32 files

Confidence score: 5/5

• This PR looks low risk to merge: the only finding is a low-severity (2/10) test-description wording issue, with no runtime or user-facing behavior impact.
• The issue is limited to naming conventions in packages/render/e2e/integrations.spec.ts (use of the forbidden word should in test titles), so it is primarily a style/compliance cleanup.
• Pay close attention to packages/render/e2e/integrations.spec.ts - update test descriptions to satisfy the no-should convention.

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="packages/render/e2e/integrations.spec.ts">

<violation number="1" location="packages/render/e2e/integrations.spec.ts:118">
P3: Custom agent: **No `should` in tests**

Test descriptions use the forbidden word `should` multiple times.</violation>
</file>

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

[cubic-dev-ai]

0 issues found across 1 file (changes from recent commits).

_{Requires human review: Auto-approval blocked by 1 unresolved issue from previous reviews.}

[cubic-dev-ai]

0 issues found across 1 file (changes from recent commits).

_{Auto-approved: PR adds e2e test infrastructure for render with Vite and Next.js. Changes are limited to test files, test project scaffolding, CI configuration, and dev dependencies. No source code modifications to}

[cubic-dev-ai]

0 issues found across 1 file (changes from recent commits).

_{Auto-approved: Adding e2e tests for render across Vite and Next.js in dev and production. All changes are test infrastructure, CI setup, and boilerplate project files. No production logic modified. Low risk.}