feat: support extending the user configuration

[petebacondarwin]

Fixes #DEVDASH-330

This feature is described in an internal doc: MINI-SPEC:Allow 3rd party build tools to generate Worker code and configuration

The main goal here is to enable tools to generate a partial configuration file that is merged into the user configuration when Wrangler commands are run.

The file must be written to ./.wrangler/config/extra.json, where the path is relative to the project path, which is the directory containing the wrangler.toml or the current working directory if there is no wrangler.toml.

The format of the file is a JSON object whose properties are the inheritable and non-inheritable options described in the Wrangler configuration documentation. Notably it cannot contain the "top level" configuration properties.

The contents of the file will be merged into the configuration of the currently selected environment before being used in all Wrangler commands.

The user does not need to manually specify that this merging should happen. It is done automatically when the file is found.

---

• 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:
• Public documentation
  • TODO (before merge)
  • Cloudflare docs PR(s): wrangler config - add extended configuration docs cloudflare-docs#18146
  • Documentation not necessary because:

[changeset-bot]

🦋 Changeset detected

Latest commit: c1022d6

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/11826008691/npm-package-wrangler-7250

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

npm install --save-dev https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/prs/7250/npm-package-wrangler-7250

Or you can use npx with this latest build directly:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/11826008691/npm-package-wrangler-7250 dev path/to/script.js

Additional artifacts:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/11826008691/npm-package-create-cloudflare-7250 --no-auto-update

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/11826008691/npm-package-cloudflare-kv-asset-handler-7250

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/11826008691/npm-package-miniflare-7250

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/11826008691/npm-package-cloudflare-pages-shared-7250

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/11826008691/npm-package-cloudflare-vitest-pool-workers-7250

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/11826008691/npm-package-cloudflare-workers-editor-shared-7250

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/11826008691/npm-package-cloudflare-workers-shared-7250

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/11826008691/npm-package-cloudflare-workflows-shared-7250

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

---

wrangler@3.86.1 includes the following runtime dependencies:

Package	Constraint	Resolved
miniflare	workspace:*	3.20241106.0
workerd	1.20241106.1	1.20241106.1
workerd --version	1.20241106.1	2024-11-06

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

[petebacondarwin]

Closing as we are not taking this approach.