JsModule {
    bom_token: missing (optional),
    interpreter_token: missing (optional),
    directives: JsDirectiveList [],
    items: JsModuleItemList [
        JsExport {
            decorators: JsDecoratorList [],
            export_token: EXPORT_KW@0..7 "export" [] [Whitespace(" ")],
            export_clause: JsExportDefaultExpressionClause {
                default_token: DEFAULT_KW@7..15 "default" [] [Whitespace(" ")],
                expression: JsIdentifierExpression {
                    name: JsReferenceIdentifier {
                        value_token: IDENT@15..16 "a" [] [],
                    },
                },
                semicolon_token: SEMICOLON@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_EXPORT@0..17
      0: JS_DECORATOR_LIST@0..0
      1: EXPORT_KW@0..7 "export" [] [Whitespace(" ")]
      2: JS_EXPORT_DEFAULT_EXPRESSION_CLAUSE@7..17
        0: DEFAULT_KW@7..15 "default" [] [Whitespace(" ")]
        1: JS_IDENTIFIER_EXPRESSION@15..16
          0: JS_REFERENCE_IDENTIFIER@15..16
            0: IDENT@15..16 "a" [] []
        2: SEMICOLON@16..17 ";" [] []
  4: EOF@17..18 "" [Newline("\n")] []