feat: add experimental_patchConfig

[emily-shen]

Fixes DEVX 1424

---

• Tests
  • TODO (before merge)
  • Tests included
  • Tests not necessary because:
• E2E Tests CI Job required? (Use "e2e" label or ask maintainer to run separately)
  • I don't know
  • Required
  • Not required because: should be covered by unit tests
• Public documentation
  • TODO (before merge)
  • Cloudflare docs PR(s):
  • Documentation not necessary because: not user facing change

[changeset-bot]

🦋 Changeset detected

Latest commit: 6c2ce25

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/12397643964/npm-package-wrangler-7521

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

npm install --save-dev https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/prs/7521/npm-package-wrangler-7521

Or you can use npx with this latest build directly:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/12397643964/npm-package-wrangler-7521 dev path/to/script.js

Additional artifacts:

wget https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/12397643964/npm-package-cloudflare-workers-bindings-extension-7521 -O ./cloudflare-workers-bindings-extension.0.0.0-vdd3c7f5ec.vsix && code --install-extension ./cloudflare-workers-bindings-extension.0.0.0-vdd3c7f5ec.vsix

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/12397643964/npm-package-create-cloudflare-7521 --no-auto-update

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/12397643964/npm-package-cloudflare-kv-asset-handler-7521

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/12397643964/npm-package-miniflare-7521

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/12397643964/npm-package-cloudflare-pages-shared-7521

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/12397643964/npm-package-cloudflare-unenv-preset-7521

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/12397643964/npm-package-cloudflare-vitest-pool-workers-7521

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/12397643964/npm-package-cloudflare-workers-editor-shared-7521

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/12397643964/npm-package-cloudflare-workers-shared-7521

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/12397643964/npm-package-cloudflare-workflows-shared-7521

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:*	3.20241205.0
workerd	1.20241205.0	1.20241205.0
workerd --version	1.20241205.0	2024-12-05

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

[penalosa]

Does this work if you take out the undefined?

[emily-shen]

no :/ I probably need to rethink the 'delete' api, but since no one is asking for it now and all of this is quite separate from the patchConfig flow that is actually used, I was just going to leave it alone for now.

Happy to take the edit with replacement stuff out of this PR as well, and just have the additive patch if you'd rather.

[penalosa]

I'm still a bit confused about the behaviour. What happens with:

// original
{
  kv_namespaces: [
    {
      binding: "MY_KV"
    },
    {
      binding: "MY_KV2"
    }
  ]
}

// replacement patch
 {
  kv_namespaces: [
    {
      binding: "MY_KV"
    }
  ]
}

?

I'd expect the output to be the below, but it sounds like it's something different?

{
  kv_namespaces: [
    {
      binding: "MY_KV"
    }
  ]
}

[emily-shen]

for future reference:

the edit-with-replacement is going through each terminal? leaf? node and updating that, in order to preserve comments. that's why it needs 'undefined' in order to actually delete something. I suppose the better way to do it would be work out the diff between the patch and original, and only edit those. Will iterate on this later 👍

[penalosa]

Couple questions, but otherwise lgtm