⭐️New: Add vue/valid-slot-scope rule

[ota-meshi]

This PR add vue/valid-slot-scope rule. (#661)

vue/valid-slot-scope rule checks whether every slot-scope (or scope) attributes is valid.

Close #661

[armano2]

@mysticatea as far as I know scoped slots allow only one parameter, and documentation is not giving any examples for more than one

[ota-meshi]

@mysticatea Thank you for released a new version of vue-eslint-parser.
I updated this rule.
This rule now only check for empty values.

[mysticatea]

LGTM, thank you!

[tangjinzhou]

Why not support multiple parameters? Our component uses multiple parameters.
And, I think empty value also should not be reported incorrectly.
ref vueComponent/ant-design-vue#301

[ota-meshi]

@tangjinzhou

Why not support multiple parameters? Our component uses multiple parameters.

Could you write details and post the issue.

And, I think empty value also should not be reported incorrectly.

What is the reason for this?
I think that blank should be reported, because it makes no sense.

[tangjinzhou]

@ota-meshi

I think that blank should be reported, because it makes no sense.

The slot-scope is like a function. For example ()=> <span/>.
I expect to get a slot that can be reused. Its role is to provide a component with a reusable slot.
So should not be limited by the number of parameters.

[tangjinzhou]

@ota-meshi
Maybe it is the best practice.
But should not be so strictly prohibited.
It is best to provide a separate rule instead of no-parsing-error.

[tangjinzhou]

#722

[ota-meshi]

#722 (comment)