deno run --env fails when no .env file is present.

[marvinhagemeister]

In Fresh we recently switched from using std's dotenv module to Deno's --env in denoland/fresh#2204 . But we noticed that passing --env when no .env file is present will exit the current process with an error message.

error: Unable to load '.env' environment variable file

With the dotenv module it didn't error when no .env file was present.

Steps to reproduce

1. Create a file foo.ts (can be empty)
2. Run deno run -A --env foo.ts

Version: Deno 1.39.1

[bartlomieju]

I think we did this on purpose when landing --env flag. @dsherret do you happen to remember this?

[dsherret]

Nope. I feel like it shouldn't error.

[iuioiua]

This was done on purpose. Should we instead print a gentle message saying that no .env file was detected?

deno/cli/args/mod.rs

Lines 723 to 727 in aadcd64

	if let Some(env_file_name) = &flags.env_file {
	if (from_filename(env_file_name)).is_err() {
	bail!("Unable to load '{env_file_name}' environment variable file")
	}
	}

[bartlomieju]

@iuioiua that makes sense. Any chance you could fix it and open a PR?