fix bug with vitest + pages with wrangler.toml

[emily-shen]

What this PR solves / how to test

Fixes #5768

tl;dr: previously, experimentalJsonConfig was always set to true in unstable_getMiniflareWorkerOptions, which is used by the vitest integration to read config options. However experimentalJsonConfig is not supported by Pages, so any Pages + vitest setup that defined a wrangler.toml would trip up an error check for json + Pages.

Author has addressed the following

• Tests
  • TODO (before merge)
  • Tests included
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• E2E Tests CI Job required? (Use "e2e" label or ask maintainer to run separately)
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  • Not required because: covered by fixture
• Changeset (Changeset guidelines)
  • TODO (before merge)
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• Public documentation
  • TODO (before merge)
  • Cloudflare docs PR(s):
  • Documentation not necessary because: bugfix

[changeset-bot]

🦋 Changeset detected

Latest commit: fb64446

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

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[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/11218014303/npm-package-wrangler-6911

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

npm install --save-dev https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/prs/6911/npm-package-wrangler-6911

Or you can use npx with this latest build directly:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/11218014303/npm-package-wrangler-6911 dev path/to/script.js

Additional artifacts:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/11218014303/npm-package-create-cloudflare-6911 --no-auto-update

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/11218014303/npm-package-cloudflare-kv-asset-handler-6911

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/11218014303/npm-package-miniflare-6911

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/11218014303/npm-package-cloudflare-pages-shared-6911

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/11218014303/npm-package-cloudflare-vitest-pool-workers-6911

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/11218014303/npm-package-cloudflare-workers-editor-shared-6911

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/11218014303/npm-package-cloudflare-workers-shared-6911

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:*	3.20240925.0
workerd	1.20240925.0	1.20240925.0
workerd --version	1.20240925.0	2024-09-25

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