Accessing binding variable name in wrangler.toml inside functions

[rohanbam]

I want to access an r2 bucket from a vitedge function.
Cloudflare docs state that in order to access r2 bucket from a worker, it is necessary to bind worker to r2 bucket using the following syntax inside wrangler.toml

r2_buckets = [
{
binding = "BUCKET-1",
bucket_name = "bucket-1",
preview_bucket_name = "bucket-1"
},
{
binding = "BUCKET-2",
bucket_name = "bucket-2",
preview_bucket_name = "bucket-2"
}
]

and then, use that binding inside the worker as follows
const object = await env.Bucket1.get(objectName, ...)

however, in the above line env is undefined inside vitedge functions.

can you provide an example of how this binding variable can be accessed?