Add header + caching to runtime type generation

[penalosa]

What this PR solves / how to test

Fixes #6575

Author has addressed the following

• Tests
  • TODO (before merge)
  • Included
  • Not necessary because:
• E2E Tests CI Job required? (Use "e2e" label or ask maintainer to run separately)
  • I don't know
  • Required / Maybe required
  • Not required because:
• Changeset (Changeset guidelines)
  • TODO (before merge)
  • Included
  • Not necessary because:
• Public documentation
  • TODO (before merge)
  • Cloudflare docs PR(s):
  • Not necessary because: internal optimisation

[changeset-bot]

🦋 Changeset detected

Latest commit: 3b31bd4

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

This PR includes changesets to release 2 packages

Name	Type
wrangler	Patch
@cloudflare/vitest-pool-workers	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[github-actions]

A wrangler prerelease is available for testing. You can install this latest build in your project with:

npm install --save-dev https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/10885016555/npm-package-wrangler-6329

You can reference the automatically updated head of this PR with:

npm install --save-dev https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/prs/6329/npm-package-wrangler-6329

Or you can use npx with this latest build directly:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/10885016555/npm-package-wrangler-6329 dev path/to/script.js

Additional artifacts:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/10885016555/npm-package-create-cloudflare-6329 --no-auto-update

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/10885016555/npm-package-cloudflare-kv-asset-handler-6329

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/10885016555/npm-package-miniflare-6329

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/10885016555/npm-package-cloudflare-pages-shared-6329

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/10885016555/npm-package-cloudflare-vitest-pool-workers-6329

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/10885016555/npm-package-cloudflare-workers-editor-shared-6329

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/10885016555/npm-package-cloudflare-workers-shared-6329

Note that these links will no longer work once the GitHub Actions artifact expires.

---

[email protected] includes the following runtime dependencies:

Package	Constraint	Resolved
miniflare	workspace:*	3.20240909.1
workerd	1.20240909.0	1.20240909.0
workerd --version	1.20240909.0	2024-09-09

Please ensure constraints are pinned, and miniflare/workerd minor versions match.

[petebacondarwin]

Converting to draft because this feels like it is not yet ready for review.

[andyjessop]

LGTM! One very minor comment.