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: JsExportDefaultDeclarationClause {
                default_token: DEFAULT_KW@7..15 "default" [] [Whitespace(" ")],
                declaration: JsFunctionExportDefaultDeclaration {
                    async_token: missing (optional),
                    function_token: FUNCTION_KW@15..24 "function" [] [Whitespace(" ")],
                    star_token: missing (optional),
                    id: JsIdentifierBinding {
                        name_token: IDENT@24..28 "test" [] [],
                    },
                    type_parameters: missing (optional),
                    parameters: JsParameters {
                        l_paren_token: L_PAREN@28..29 "(" [] [],
                        items: JsParameterList [
                            JsFormalParameter {
                                decorators: JsDecoratorList [],
                                binding: JsIdentifierBinding {
                                    name_token: IDENT@29..30 "a" [] [],
                                },
                                question_mark_token: missing (optional),
                                type_annotation: missing (optional),
                                initializer: missing (optional),
                            },
                            COMMA@30..32 "," [] [Whitespace(" ")],
                            JsFormalParameter {
                                decorators: JsDecoratorList [],
                                binding: JsIdentifierBinding {
                                    name_token: IDENT@32..33 "b" [] [],
                                },
                                question_mark_token: missing (optional),
                                type_annotation: missing (optional),
                                initializer: missing (optional),
                            },
                        ],
                        r_paren_token: R_PAREN@33..35 ")" [] [Whitespace(" ")],
                    },
                    return_type_annotation: missing (optional),
                    body: JsFunctionBody {
                        l_curly_token: L_CURLY@35..36 "{" [] [],
                        directives: JsDirectiveList [],
                        statements: JsStatementList [],
                        r_curly_token: R_CURLY@36..37 "}" [] [],
                    },
                },
                semicolon_token: missing (optional),
            },
        },
    ],
    eof_token: EOF@37..38 "" [Newline("\n")] [],
}

0: JS_MODULE@0..38
  0: (empty)
  1: (empty)
  2: JS_DIRECTIVE_LIST@0..0
  3: JS_MODULE_ITEM_LIST@0..37
    0: JS_EXPORT@0..37
      0: JS_DECORATOR_LIST@0..0
      1: EXPORT_KW@0..7 "export" [] [Whitespace(" ")]
      2: JS_EXPORT_DEFAULT_DECLARATION_CLAUSE@7..37
        0: DEFAULT_KW@7..15 "default" [] [Whitespace(" ")]
        1: JS_FUNCTION_EXPORT_DEFAULT_DECLARATION@15..37
          0: (empty)
          1: FUNCTION_KW@15..24 "function" [] [Whitespace(" ")]
          2: (empty)
          3: JS_IDENTIFIER_BINDING@24..28
            0: IDENT@24..28 "test" [] []
          4: (empty)
          5: JS_PARAMETERS@28..35
            0: L_PAREN@28..29 "(" [] []
            1: JS_PARAMETER_LIST@29..33
              0: JS_FORMAL_PARAMETER@29..30
                0: JS_DECORATOR_LIST@29..29
                1: JS_IDENTIFIER_BINDING@29..30
                  0: IDENT@29..30 "a" [] []
                2: (empty)
                3: (empty)
                4: (empty)
              1: COMMA@30..32 "," [] [Whitespace(" ")]
              2: JS_FORMAL_PARAMETER@32..33
                0: JS_DECORATOR_LIST@32..32
                1: JS_IDENTIFIER_BINDING@32..33
                  0: IDENT@32..33 "b" [] []
                2: (empty)
                3: (empty)
                4: (empty)
            2: R_PAREN@33..35 ")" [] [Whitespace(" ")]
          6: (empty)
          7: JS_FUNCTION_BODY@35..37
            0: L_CURLY@35..36 "{" [] []
            1: JS_DIRECTIVE_LIST@36..36
            2: JS_STATEMENT_LIST@36..36
            3: R_CURLY@36..37 "}" [] []
        2: (empty)
  4: EOF@37..38 "" [Newline("\n")] []