Allow marking externals in Pages Functions

[GregBrimble]

What this PR solves / how to test

This allows Pages Plugins authors to mark dependencies as external when bundling their plugin. This is useful if you want to declare a module as a peer dependency.

Author has addressed the following

• Tests
  • TODO (before merge)
  • Included
  • Not necessary because:
• Changeset (Changeset guidelines)
  • TODO (before merge)
  • Included
  • Not necessary because:
• Public documentation
  • TODO (before merge)
  • Cloudflare docs PR(s): Add information about the 'wrangler pages functions build --plugin' command and its arguments incl. '--external' cloudflare-docs#13397
  • Not necessary because

[changeset-bot]

🦋 Changeset detected

Latest commit: ffad408

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

This PR includes changesets to release 2 packages

Name	Type
wrangler	Minor
@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/8625712351/npm-package-wrangler-5172

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

npm install --save-dev https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/prs/5172/npm-package-wrangler-5172

Or you can use npx with this latest build directly:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8625712351/npm-package-wrangler-5172 dev path/to/script.js

Additional artifacts:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8625712351/npm-package-create-cloudflare-5172 --no-auto-update

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8625712351/npm-package-cloudflare-kv-asset-handler-5172

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8625712351/npm-package-miniflare-5172

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8625712351/npm-package-cloudflare-pages-shared-5172

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8625712351/npm-package-cloudflare-vitest-pool-workers-5172

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

---

wrangler@3.48.0 includes the following runtime dependencies:

Package	Constraint	Resolved
miniflare	workspace:*	3.20240404.0
workerd	1.20240404.0	1.20240404.0
workerd --version	1.20240404.0	2024-04-04

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

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 70.53%. Comparing base (6c3be5b) to head (47d15a2).
Report is 20 commits behind head on main.

❗ Current head 47d15a2 differs from pull request most recent head ffad408. Consider uploading reports for the commit ffad408 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5172      +/-   ##
==========================================
- Coverage   72.09%   70.53%   -1.56%     
==========================================
  Files         331      298      -33     
  Lines       17175    15540    -1635     
  Branches     4386     4000     -386     
==========================================
- Hits        12382    10961    -1421     
+ Misses       4793     4579     -214     

Files	Coverage Δ
packages/wrangler/src/pages/build.ts	67.41% <ø> (-4.27%)	⬇️
packages/wrangler/src/pages/buildFunctions.ts	90.00% <ø> (ø)
...ckages/wrangler/src/pages/functions/buildPlugin.ts	22.58% <ø> (ø)
...ckages/wrangler/src/pages/functions/buildWorker.ts	74.50% <100.00%> (ø)
packages/wrangler/src/deployment-bundle/bundle.ts	87.70% <50.00%> (+0.20%)	⬆️

... and 115 files with indirect coverage changes

[jahands]

LGTM