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docs: env expand feature only works for variables in env files (#18354)

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docs/guide/env-and-mode.md
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@ -55,7 +55,7 @@ console.log(import.meta.env.DB_PASSWORD) // undefined
As shown above, `VITE_SOME_KEY` is a number but returns a string when parsed. The same would also happen for boolean env variables. Make sure to convert to the desired type when using it in your code.
:::
Also, Vite uses [dotenv-expand](https://github.com/motdotla/dotenv-expand) to expand variables out of the box. To learn more about the syntax, check out [their docs](https://github.com/motdotla/dotenv-expand#what-rules-does-the-expansion-engine-follow).
Also, Vite uses [dotenv-expand](https://github.com/motdotla/dotenv-expand) to expand variables written in env files out of the box. To learn more about the syntax, check out [their docs](https://github.com/motdotla/dotenv-expand#what-rules-does-the-expansion-engine-follow).
Note that if you want to use `$` inside your environment value, you have to escape it with `\`.