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docs: set dynamic env variables in config file #19136

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docs: set dynamic env variables in config file #19136

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18 changes: 18 additions & 0 deletions docs/config/index.md
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Original file line number Diff line number Diff line change
Expand Up @@ -115,3 +115,21 @@ export default defineConfig(({ mode }) => {
}
})
```

## Setting Environment Variables inside Config file

Use the define block in Vite to inject global constants or environment variables accessible within the application at build time. While `.env` files should always be used for static variables, dynamic values like the latest Git commit hash can also be set.

```js twoslash
import { defineConfig } from 'vite'
import { execSync } from 'child_process'

export default defineConfig({
define: {
// Make the commit hash available as an env varaible in your app
'import.meta.env.VITE_CODE_VERSION': JSON.stringify(
execSync('git rev-parse HEAD').toString().trim(),
),
},
})
```
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