Postfix expressions

Syntax

    PostfixExpression :
      FullPostfixExpression
      ShortNewExpression
    FullPostfixExpression :
      PrimaryExpression
      FullNewExpression
      FullPostfixExpression PropertyOperator
      SuperExpression PropertyOperator
      FullPostfixExpression NonNull
      FullPostfixExpression Arguments
      FullPostfixExpression TypeArguments
      FullPostfixExpression QueryOperator
      FullPostfixExpression [no line break] ++
      FullPostfixExpression [no line break] --
      FullPostfixExpression OptionalChaining
    NonNull :
      !
    OptionalChaining :
      ?. QualifiedIdentifier
      ?. Brackets
      ?. Arguments
      OptionalChaining PropertyOperator
      OptionalChaining NonNull
      OptionalChaining Arguments
      OptionalChaining TypeArguments
      OptionalChaining QueryOperator
      OptionalChaining OptionalChaining