PUG (Jade) Mixins

pug_mixins_PhpStorm_problem.pug

//-
  PhpStorm 2018.1 shows multiple errors and is not able to handle this fully valid PUG mixin

mixin test(param1, param2 = "test", optionalParam3)
    - var xOptionalParam3 = optionalParam3 || "is none";
    <!{param1}> !{param2} => !{xOptionalParam3} </!{param1}>
    

test_sub_items.pug

//-
  Nested use of mixins with params and content block!


//-
  <div><span>a</span>:<em>some content</em></div>

mixin test(val)
 div
  span= val
  | :
  em
    block

+test("a")
  | some content


//-
  <ol>
    <li>EMPTY! (abc)</li>
    <li>default item (def)</li>
    <li>new... (ghi)</li>
  </ol>

mixin ArrayList()
  ol
    | #[block]

mixin ArrayListItemPlaceholder()
  li EMPTY! (#[block])

mixin ArrayListItem()
  li default item (#[block])
  
mixin ArrayListItemNew()
  li new... (#[block])


+ArrayList()

  +ArrayListItemPlaceholder()
    | abc
  
  +ArrayListItem()
    | def
    
  +ArrayListItemNew()
    | ghi