The doc says: "any vars key are exposed as global variables", but they are not

I want to define something like DEV=true to detect dev mode (followed by some different initiating path), but access variable "DEV" in top level code just cause: "ReferenceError: DEV is not defined".
Is this a misunderstanding of the doc? I'm confused, the doc is in https://developers.cloudflare.com/workers/wrangler/environments/#staging-and-production-environments

Cloudflare Docs

Environments · Cloudflare Workers docs

Deploy the same Worker application with different configuration for each environment.

Cch3coohlink I want to define something like DEV=true to detect dev mode (followed by some di...

Idle•1/9/25, 3:15 PM

i think that'd be env.ENVIRONMENTenv.ENVIRONMENT

Walshy•1/9/25, 3:18 PM

indeed ^ will make sure the docs are updated

ch3coohlinkOP•1/9/25, 3:18 PM

I'm using different key than the example, and the env variable does not exist outside fetch function

ch3coohlinkOP•1/9/25, 3:18 PM

i see

ch3coohlinkOP•1/9/25, 3:19 PM

my problem still remains though...

ch3coohlinkOP•1/9/25, 3:19 PM

seems no eazy way to detect dev mode in the init time

WWalshy indeed ^ will make sure the docs are updated

ch3coohlinkOP•1/9/25, 3:26 PM

tried the "define" option in wrangler, but it didn't substitute the target string in my main.ts. What's the target files this option tries to substitute? info missing in the doc. @Walshy | Workers/Pages

Walshy•1/9/25, 3:30 PM

best way for you to do this is the env var you were doing before

Walshy•1/9/25, 3:30 PM

this is how i do it in hono: https://github.com/WalshyDev/blob-builds/blob/main/worker/src/handlers/all.ts#L13-L14

Walshy•1/9/25, 3:31 PM

middleware and just set based on env

ch3coohlinkOP•1/9/25, 3:31 PM

thanks, I'll try