Add message arguments to declaration-property-unit-allowed-list

[glen-84]

What is the problem you're trying to solve?

Setting a custom message for the declaration-property-unit-allowed-list rule.

What solution would you like to see?

"declaration-property-unit-allowed-list": [
    {
        "line-height": []
    },
    {
        message: (propertyName, _units) => {
            switch (propertyName) {
                case "line-height":
                    return "Prefer unitless numbers for line-height values";
            }
        }
    }
]

[ybiquitous]

@glen-84 Thanks for the proposal. See also #6453 (comment).

I've labeled the issue as ready to implement. Please consider contributing if you have time.

[glen-84]

@ybiquitous

I think that this issue was accidentally closed. This is for allowed, not disallowed. 🙂

/cc @chloerice.

[ybiquitous]

@glen-84 Oh, thank you for letting us know!