Fix #1808: Lint slots in attribute-hyphenation

lib/rules/attribute-hyphenation.js

@@ -106,7 +106,11 @@ module.exports = {
 
     return utils.defineTemplateBodyVisitor(context, {
       VAttribute(node) {
-        if (!utils.isCustomComponent(node.parent.parent)) return
+        if (
+          !utils.isCustomComponent(node.parent.parent) &&
+          node.parent.parent.name !== 'slot'
+        )
+          return
 
         const name = !node.directive
           ? node.key.rawName

tests/lib/rules/attribute-hyphenation.js

@@ -56,6 +56,16 @@ ruleTester.run('attribute-hyphenation', rule, {
       filename: 'test.vue',
       code: '<template><my-component :[foo-bar]></my-component></template>',
       options: ['never']
+    },
+    {
+      filename: 'test.vue',
+      code: '<template><div><slot my-prop></slot></div></template>',
+      options: ['always']
+    },
+    {
+      filename: 'test.vue',
+      code: '<template><div><slot myProp></slot></div></template>',
+      options: ['never']
     }
   ],
 
@@ -252,6 +262,32 @@ ruleTester.run('attribute-hyphenation', rule, {
           line: 3
         }
       ]
+    },
+    {
+      filename: 'test.vue',
+      code: '<template><div><slot my-prop="foo"></slot></div></template>',
+      output: '<template><div><slot myProp="foo"></slot></div></template>',
+      options: ['never'],
+      errors: [
+        {
+          message: "Attribute 'my-prop' can't be hyphenated.",
+          type: 'VIdentifier',
+          line: 1
+        }
+      ]
+    },
+    {
+      filename: 'test.vue',
+      code: '<template><div><slot MyProp="Bar"></slot></div></template>',
+      output: '<template><div><slot my-prop="Bar"></slot></div></template>',
+      options: ['always'],
+      errors: [
+        {
+          message: "Attribute 'MyProp' must be hyphenated.",
+          type: 'VIdentifier',
+          line: 1
+        }
+      ]
     }
   ]
 })