hello! i’m wondering what the best

hello! i’m wondering what the best practice is for defining dev-specific code within a worker script - i did try defining an env in the wrangler.json file with a variable referring to prod vs dev environment, but it seems that while subsequently running “wrangler dev” my worker lost access to the bindings defined thereafter in the file, so i’m just wondering if there’s a recommended approach for this that allows me to run certain code solely under “wrangler dev” or in prod. thanks!