Environment Vars Not Working

I'm trying to get environment variables working as described in the documentation but not having any lucky.

serverless.yml

service:
name: library

provider:
name: cloudflare
stage: systest
config:
accountId:
zoneId:
environment:
MY_TEST: HELLO

plugins:
- serverless-cloudflare-workers

functions:
library:
name: library
script: handlers/test
environment:
MY_TEST: WORLD
events:
- http:
url: docs.somedomain.com/*
method: GET

test.js

```
addEventListener('fetch', event => {
event.respondWith(handle(event))
})

async function handle(event) {

console.log('MY_TEST: ', process.env.MY_TEST);

return new Response(null, { status: 200 });
}
```

I've tried `process.env.MY_TEST` and just plain old `MY_TEST` and no luck.