[Rule Idea] Enforce Splattributes

This rule should check that exactly one element in the template has ...attributes attached to it.

Alternatively we could make it configurable to only error for multiple ...attributes, but allow zero and one instances of it.

[Turbo87]

hmm okay, guess then the rule should only warn if there are no splattributes at all

[lifeart]

I think this rule should work if component has internal “wrapper” node, or component and “wrapped node inside” (only in this case), other cases looks so complex and our linting may confuse developers.

rule apply exmples:

<div ...attributes>
  some content
</div>

<LooksLikeComponentNode>
   <div ...attributes></div>
</LooksLikeComponentNode>

<LooksLikeComponentNode ...attributes />

unsupported cases:

<div></div>
<div></div>

<LooksLikeComponentNode>
<div></div>
<div></div>
</LooksLikeComponentNode>

<LooksLikeComponentNode>
some text
</LooksLikeComponentNode>

---

• if only one root node in template and node is not capitalized -> apply rule into this node

• if only one root node and node self-closed -> apply rule into this node

• if only one root node and node writeen block and capitalized and inside node level only one child node and this node is not capitalized -> apply rule into this child node

• if template already has ...attributes -> ignore rule apply

• other cases -> ignore rule apply