allow immutable state variables to be named in CAPS_SNAKE_CASE

[quezak]

This is more of a question than a bug report -- IMO immutable variables should be allowed to be treated as constants, since they in fact cannot be changed.

Currently the code below returns a warning Variable name must be in mixedCase when linted with the recommended ruleset.

contract Test {
  uint16 public immutable TEST_MODE;
  constructor(uint16 _testMode) { TEST_MODE = _testMode; }
}

[fvictorio]

I think we need to rethink the whole approach to naming, since it's hard to make some calls. For example, the linked docs use mixedCase for immutable variables, but I agree that it makes sense to use SNAKE_CASE.

The quick and backward compatible fix here is to add an option to the var-name-mixedcase. Something like { ignoreImmutable: true }. The problem is, if you do that you would also need to add a mirror option to const-name-snakecase, something like { allowImmutable: true }. What do you think?

[quezak]

It's hard to think of a good single setting here, since it really concerns two rules. The simplest way would be to have some "general config" option treat-immutable-vars-as-constants, but that's kinda bad design since it's not really a general option, just a two-rule option...
Maybe it will be enough to add a treat-immutable-var-as-constant: true option to both these rules? You'd have to turn on both to have immutable variables linted in CAPS_SNAKE_CASE, and without them it would lint them in mixedCase.

[fvictorio]

Yeah, I'd be fine with that. Especially because having such a long and ugly option would motivate me to totally redo the naming rules in the next major 😄

[benesjan]

I don't know what is the state of this issue now but having support for this would be great 👍

[maxholloway]

Plus one, would love to see this!

[smartcontracts]

+1 on this, would be great, Optimism prefers SCREAMING_SNAKE_CASE for immutables

[hktitof]

+1 here too guys

[yuradmt]

agree, let's add the snake case

[clicman]

Are any updates?

[SvenMeyer]

yes,please !

[dbale-altoros]

see this PR
#458
will add new rule to treat immutable as constants or mixed case as needed