JsModule {
    bom_token: missing (optional),
    interpreter_token: missing (optional),
    directives: JsDirectiveList [],
    items: JsModuleItemList [
        JsClassDeclaration {
            decorators: JsDecoratorList [],
            abstract_token: missing (optional),
            class_token: CLASS_KW@0..6 "class" [] [Whitespace(" ")],
            id: JsIdentifierBinding {
                name_token: IDENT@6..8 "B" [] [Whitespace(" ")],
            },
            type_parameters: missing (optional),
            extends_clause: missing (optional),
            implements_clause: missing (optional),
            l_curly_token: L_CURLY@8..10 "{" [] [Whitespace(" ")],
            members: JsClassMemberList [
                JsBogusMember {
                    items: [
                        JsPropertyModifierList [],
                        JsLiteralMemberName {
                            value: IDENT@10..13 "foo" [] [],
                        },
                        JsBogus {
                            items: [
                                QUESTION@13..14 "?" [] [],
                            ],
                        },
                        SEMICOLON@14..16 ";" [] [Whitespace(" ")],
                    ],
                },
            ],
            r_curly_token: R_CURLY@16..17 "}" [] [],
        },
    ],
    eof_token: EOF@17..18 "" [Newline("\n")] [],
}

0: JS_MODULE@0..18
  0: (empty)
  1: (empty)
  2: JS_DIRECTIVE_LIST@0..0
  3: JS_MODULE_ITEM_LIST@0..17
    0: JS_CLASS_DECLARATION@0..17
      0: JS_DECORATOR_LIST@0..0
      1: (empty)
      2: CLASS_KW@0..6 "class" [] [Whitespace(" ")]
      3: JS_IDENTIFIER_BINDING@6..8
        0: IDENT@6..8 "B" [] [Whitespace(" ")]
      4: (empty)
      5: (empty)
      6: (empty)
      7: L_CURLY@8..10 "{" [] [Whitespace(" ")]
      8: JS_CLASS_MEMBER_LIST@10..16
        0: JS_BOGUS_MEMBER@10..16
          0: JS_PROPERTY_MODIFIER_LIST@10..10
          1: JS_LITERAL_MEMBER_NAME@10..13
            0: IDENT@10..13 "foo" [] []
          2: JS_BOGUS@13..14
            0: QUESTION@13..14 "?" [] []
          3: SEMICOLON@14..16 ";" [] [Whitespace(" ")]
      9: R_CURLY@16..17 "}" [] []
  4: EOF@17..18 "" [Newline("\n")] []
--
optional_member.js:1:14 parse ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  × `?` modifiers can only be used in TypeScript files
  
  > 1 │ class B { foo?; }
      │              ^
    2 │ 
  
--
class B { foo?; }