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--
class_extends_err.js:1:21 parse ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  × 'extends' clause already seen.
  
  > 1 │ class A extends bar extends foo {}
      │                     ^^^^^^^^^^^
    2 │ class B extends bar, foo {}
    3 │ class C implements B {}
  
  i first 'extends' clause
  
  > 1 │ class A extends bar extends foo {}
      │         ^^^^^^^^^^^
    2 │ class B extends bar, foo {}
    3 │ class C implements B {}
  
--
class_extends_err.js:2:22 parse ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  × Classes can only extend a single class.
  
    1 │ class A extends bar extends foo {}
  > 2 │ class B extends bar, foo {}
      │                      ^^^
    3 │ class C implements B {}
    4 │ 
  
--
class_extends_err.js:3:9 parse ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  × classes can only implement interfaces in TypeScript files
  
    1 │ class A extends bar extends foo {}
    2 │ class B extends bar, foo {}
  > 3 │ class C implements B {}
      │         ^^^^^^^^^^^^
    4 │ 
  
--
class A extends bar extends foo {}
class B extends bar, foo {}
class C implements B {}