env file load incorrect

Describe the bug

I have a .env file looks like this:

APP_SIGN_SALT="PICUE#3$LCDG56h$LBNOD3*1H6ER4Y#DN12G6Z3J"

But in my app, the env variable became this:

console.log(import.meta.env.APP_SIGN_SALT);  // =>PICUE#3*1H6ER4Y#DN12G6Z3J

In dotenv@16.0.3, the env variable is correct:

require('dotenv').config();
console.log(process.env.APP_SIGN_SALT); // => PICUE#3$LCDG56h$LBNOD3*1H6ER4Y#DN12G6Z3J

Reproduction

https://stackblitz.com/edit/vitejs-vite-j9ece2?file=src/App.vue

Steps to reproduce

No response

System Info

System:
    OS: macOS 12.3.1
    CPU: (4) x64 Intel(R) Core(TM) i5-7500 CPU @ 3.40GHz
    Memory: 779.70 MB / 16.00 GB
    Shell: 5.8 - /bin/zsh
  Binaries:
    Node: 16.13.1 - ~/.nvm/versions/node/v16.13.1/bin/node
    Yarn: 1.22.15 - ~/.nvm/versions/node/v16.13.1/bin/yarn
    npm: 8.5.5 - ~/.nvm/versions/node/v16.13.1/bin/npm
  Browsers:
    Chrome: 106.0.5249.103
    Firefox Developer Edition: 106.0
    Safari: 15.4

Used Package Manager

pnpm

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.

[cjosue15]

I would like to help with update in the documentation 😃, i’m gonna send my PR

[sapphi-red]

Vite uses dotenv-expand so I think this is an expected behavior. https://github.com/motdotla/dotenv-expand#what-rules-does-the-expansion-engine-follow

I think we should add some explanation about this here. https://vitejs.dev/guide/env-and-mode.html#env-files

I guess you thought it work with dotenv@16.0.3 because you did not use dotenv-expand.