--dist-dir should override package.json main field

[dephiros]

🙋 feature request

In #4113, I saw the team has added back --dist-dir. However, it is unexpected to me that this option has lower priority than package.json main field.

🤔 Expected Behavior

I would expect cli option take precedence over config

💁 Possible Solution

🔦 Context

💻 Examples

[mischnic]

The idea was that the config in package.json is more specific (per target) then the flag (for all targets) and so the more specific one applies.

cc @devongovett

[kflorence]

I just ran into this for --public-url and I also find it very unintuitive. I can't think of any other tools I use that don't allow CLI flags to override configuration. In my case, I am also building for a single target (parcel build --target=web --public-url=./foo/bar).