JsModule {
    bom_token: missing (optional),
    interpreter_token: missing (optional),
    directives: JsDirectiveList [],
    items: JsModuleItemList [
        TsDeclareFunctionDeclaration {
            async_token: missing (optional),
            function_token: FUNCTION_KW@0..9 "function" [] [Whitespace(" ")],
            id: JsIdentifierBinding {
                name_token: IDENT@9..10 "a" [] [],
            },
            type_parameters: missing (optional),
            parameters: JsParameters {
                l_paren_token: L_PAREN@10..11 "(" [] [],
                items: JsParameterList [
                    JsRestParameter {
                        decorators: JsDecoratorList [],
                        dotdotdot_token: DOT3@11..14 "..." [] [],
                        binding: JsIdentifierBinding {
                            name_token: IDENT@14..23 "arguments" [] [],
                        },
                        type_annotation: TsTypeAnnotation {
                            colon_token: COLON@23..25 ":" [] [Whitespace(" ")],
                            ty: TsArrayType {
                                element_type: TsAnyType {
                                    any_token: ANY_KW@25..28 "any" [] [],
                                },
                                l_brack_token: L_BRACK@28..29 "[" [] [],
                                r_brack_token: R_BRACK@29..30 "]" [] [],
                            },
                        },
                    },
                ],
                r_paren_token: R_PAREN@30..31 ")" [] [],
            },
            return_type_annotation: TsReturnTypeAnnotation {
                colon_token: COLON@31..33 ":" [] [Whitespace(" ")],
                ty: TsVoidType {
                    void_token: VOID_KW@33..37 "void" [] [],
                },
            },
            semicolon_token: SEMICOLON@37..38 ";" [] [],
        },
    ],
    eof_token: EOF@38..39 "" [Newline("\n")] [],
}

0: JS_MODULE@0..39
  0: (empty)
  1: (empty)
  2: JS_DIRECTIVE_LIST@0..0
  3: JS_MODULE_ITEM_LIST@0..38
    0: TS_DECLARE_FUNCTION_DECLARATION@0..38
      0: (empty)
      1: FUNCTION_KW@0..9 "function" [] [Whitespace(" ")]
      2: JS_IDENTIFIER_BINDING@9..10
        0: IDENT@9..10 "a" [] []
      3: (empty)
      4: JS_PARAMETERS@10..31
        0: L_PAREN@10..11 "(" [] []
        1: JS_PARAMETER_LIST@11..30
          0: JS_REST_PARAMETER@11..30
            0: JS_DECORATOR_LIST@11..11
            1: DOT3@11..14 "..." [] []
            2: JS_IDENTIFIER_BINDING@14..23
              0: IDENT@14..23 "arguments" [] []
            3: TS_TYPE_ANNOTATION@23..30
              0: COLON@23..25 ":" [] [Whitespace(" ")]
              1: TS_ARRAY_TYPE@25..30
                0: TS_ANY_TYPE@25..28
                  0: ANY_KW@25..28 "any" [] []
                1: L_BRACK@28..29 "[" [] []
                2: R_BRACK@29..30 "]" [] []
        2: R_PAREN@30..31 ")" [] []
      5: TS_RETURN_TYPE_ANNOTATION@31..37
        0: COLON@31..33 ":" [] [Whitespace(" ")]
        1: TS_VOID_TYPE@33..37
          0: VOID_KW@33..37 "void" [] []
      6: SEMICOLON@37..38 ";" [] []
  4: EOF@38..39 "" [Newline("\n")] []