Support wrangler pages functions build-env

[penalosa]

What this PR solves / how to test

This adds a hidden wrangler pages functions build-env command, which prints the environment variables for the current environment to the terminal. This is for use by internal tooling, and shouldn't be used directly by end users.

Fixes DEVX-1179

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): https://github.com/cloudflare/cloudflare-docs/pull/...
  • Not necessary because: This is a hidden command

[changeset-bot]

🦋 Changeset detected

Latest commit: c790b5c

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/8332188947/npm-package-wrangler-5279

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

npm install --save-dev https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/prs/5279/npm-package-wrangler-5279

Or you can use npx with this latest build directly:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8332188947/npm-package-wrangler-5279 dev path/to/script.js

Additional artifacts:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8332188947/npm-package-create-cloudflare-5279 --no-auto-update

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8332188947/npm-package-cloudflare-kv-asset-handler-5279

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8332188947/npm-package-miniflare-5279

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8332188947/npm-package-cloudflare-pages-shared-5279

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8332188947/npm-package-cloudflare-vitest-pool-workers-5279

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

---

wrangler@3.34.2 includes the following runtime dependencies:

Package	Constraint	Resolved
miniflare	workspace:*	3.20240304.2
workerd	1.20240314.0	1.20240314.0
workerd --version	1.20240314.0	2024-03-14

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.64%. Comparing base (1720f0a) to head (c790b5c).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5279      +/-   ##
==========================================
+ Coverage   71.49%   71.64%   +0.15%     
==========================================
  Files         311      312       +1     
  Lines       16170    16208      +38     
  Branches     4137     4144       +7     
==========================================
+ Hits        11561    11613      +52     
+ Misses       4609     4595      -14     

Files	Coverage Δ
packages/wrangler/src/config/config.ts	100.00% <ø> (ø)
packages/wrangler/src/config/index.ts	88.82% <100.00%> (+3.19%)	⬆️
packages/wrangler/src/config/validation-pages.ts	97.61% <ø> (ø)
packages/wrangler/src/pages/build-env.ts	100.00% <100.00%> (ø)
packages/wrangler/src/pages/index.ts	84.61% <100.00%> (+0.61%)	⬆️

... and 9 files with indirect coverage changes

[CarmenPopoviciu]

LGTM! Thx for working on this!