🚀 Feature Request: Detect dev/publish during custom build command

[Ehesp]

Describe the solution

Given the following, where there's a custom build flow:

[build]
command = "custom_cli build"

I'd like to be able to detect whether wrangler dev or wrangler publish has triggered the command, as to do some custom logic in the build command. As far as I can see, it is not possible to detect this at all.

I also tried defining .dev.vars but it seems this is loaded after the custom build command, so I can't use that to detect the environment.

[Ehesp]

Ah this might be what I'm looking for: cloudflare/miniflare#116

I'll give it a try and see if it solves the issue.

EDIT: Ah no, this isn't the same. This still expects a --env flag in the wrangler command vs being automatic.

[github-actions]

🤖✨ Beep boop! I've opened a draft PR with a fix: #12215

Tests are passing! A human should give it a once-over before merging though—I'm just a mass of neural network weights, after all.