Синтаксис Определения Классов ClassDeclaration [Yield, Await, Default] : class BindingIdentifier [?Yield, ?Await] ClassTail [?Yield, ?Await] [+Default] class ClassTail [?Yield, ?Await] ClassExpression [Yield, Await] : class BindingIdentifier [?Yield, ?Await] opt ClassTail [?Yield, ?Await] ClassTail [Yield, Await] : ClassHeritage [?Yield, ?Await] opt { ClassBody [?Yield, ?Await] opt } ClassHeritage [Yield, Await] […]