Debugging target detection

[mischnic]

🙋 feature request

Provide a way to print the target configuration that was inferred from/configured in package.json and CLI flags like --public-url. So what was detected and ideally where that information comes from.

💁 Possible Solution

• Either on --log-level verbose
• Or (what might be easier to use) a CLI command like parcel print-targets that does exactly that.

🔦 Context

cc @fregante

https://twitter.com/fregante/status/1455678061119168519

[fregante]

It would be great to automatically print this information when an error happens, especially because often they don't have a lot of context information, for example:

• Bundles must have unique names has no context, like many other errors #7255