Missing import.meta.env using unocss@66 on astro 5

Pre-requisites

// This is the version of node and pnpm I use on my machine.
"engines": {
  "node": "23.8.0",
  "pnpm": "10.4.1"
}

Steps to reproduce

1. Run pnpm install to install all dependencies.
2. Run pnpm dev to run astro in dev mode.
3. You will see the following logs in the terminal.

   undefined # this logs the value from import.meta.env
   Cannot read properties of undefined (reading 'NODE_ENV') # this is the error due to missing import.meta.env

4. Done.

Reinstall with unocss@65.4.3

1. Update and pin the version of unocss to 65.4.3.

   - "unocss": "66.0.0"
   - "unocss": "65.4.3"

2. Force install all dependencies by running pnpm install --force.
3. Run pnpm dev and no errors.
4. Done.

References

1. unocss/unocss#4441