Breaking change to env vars expansion since vite@5.1.2

[nezed]

Describe the bug

We're using env expansion feature for our .env files.

Given following .env file as example:

# .env
VITE_SOURCE=12345
VITE_EXPANDED=$VITE_SOURCE-678-ab

We expect, the behaviour of Vite@<=5.1.1:

console.log(import.meta.env.VITE_EXPANDED) // 12345-678-ab

Actual result for Vite@>=5.1.2:

console.log(import.meta.env.VITE_EXPANDED) // 12345

the -678-ab part is missing now

Reproduction

https://stackblitz.com/edit/vitejs-vite-yalk8f?file=.env

Steps to reproduce

• have any setup with Vite@5.1.2+
• have any .env file setup
• in .env file have an env variable vith env expansion and trailing content

UPD: Seems that the braking change have only affected the env expansion with kebab-cased content after the env var reference.

Example:

Vite@<=5.1.1 (correct)

Vite@>=5.1.2 (breaking change)

You can try it yourself by changing a Vite version in this minimalistic Vite-only example

System Info

Seems to be reproducible in setup and package manager.

Verified on:
Package managers: npm, pnpm
Envs: OS X, StackBlitz
Vite setup: `npm create vite` is just fine
.env loading method: both
 - .env in root directory with zero configuration
 - via `loadEnv()`

Used Package Manager

npm

Logs

No response

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Make sure this is a Vite issue and not a framework-specific issue. For example, if it's a Vue SFC related bug, it should likely be reported to vuejs/core instead.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion or join our Discord Chat Server.
• The provided reproduction is a minimal reproducible example of the bug.

[stackblitz]

Start a new pull request in StackBlitz Codeflow.

• vitejs-vite-yalk8f (Open reproduction)

[nezed]

The root cause seems to be dotenv-expand@^11.0.3, brought to Vite@5.1.2 with #15875

See the issue motdotla/dotenv-expand#124

[akashMasih]

Working on this issue

[bitbirddev]

having the same issue. thanks @akashMasih for working on a solution!

[nezed]

Hey @akashMasih @bitbirddev, don't hesitate to collaborate on root-cause issue motdotla/dotenv-expand#124 as well.
Just a thumbs up or a comment would be great 😉