Add shared local env loading helpers

[jamesopstad]

Add shared local env loading helpers with Vite-compatible .env file resolution and Wrangler-compatible parsing and expansion. Mode-specific .dev.vars files are selected exclusively and are not merged with .env files or process values.

This is for use in Vite plugin v2 and cf.

Note that complete alignment with Vite was avoided because Vite patches dotenv-expand.

---

• Tests
  • Tests included/updated
  • Automated tests not possible - manual testing has been completed as follows:
  • Additional testing not necessary because:
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: internal change

A picture of a cute animal (not mandatory, but encouraged)

[changeset-bot]

🦋 Changeset detected

Latest commit: ecc294b

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

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[pkg-pr-new]

@cloudflare/autoconfig

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@cloudflare/build-output-utils

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@cloudflare/codemods

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create-cloudflare

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@cloudflare/deploy-helpers

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@cloudflare/kv-asset-handler

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miniflare

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@cloudflare/pages-functions

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@cloudflare/pages-shared

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@cloudflare/unenv-preset

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@cloudflare/vite-plugin

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@cloudflare/vitest-plugin

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@cloudflare/workers-auth

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@cloudflare/workers-editor-shared

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@cloudflare/workers-utils

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wrangler

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commit: ecc294b

[ask-bonk]

I'm Bonk, and I've done a quick review of your PR.

Adds shared .env and .dev.vars loading helpers.

1. P1: Posted 1 inline suggestion.

github run

[workers-devprod]

Codeowners approval required for this PR:

• ✅ @cloudflare/wrangler

Show detailed file reviewers

[devin-ai-integration]

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This report is out of date. Scroll down for Devin Review's latest report on this PR.

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.

[NuroDev]

Overall LGTM. Just needs that Bonk comment addressing

[devin-ai-integration]

Devin Review found 2 new potential issues.

[NuroDev]

Seems there is some conflicts that need fixing but then good to merge

[workers-devprod]

Codeowners reviews satisfied