What version of astro are you using?

1.0.0-beta.42

Are you using an SSR adapter? If so, which one?

None

What package manager are you using?

yarn

What operating system are you using?

Windows

Describe the Bug

Set base config to '/blog' in astro.config.mjs, but import.meta.env.BASE_URL is still '/'.

Link to Minimal Reproducible Example

https://stackblitz.com/edit/github-rtg6u1?file=astro.config.mjs&on=stackblitz

Participation

• I am willing to submit a pull request for this issue.