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    interpreter_token: missing (optional),
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                    l_curly_token: L_CURLY@19..20 "{" [] [],
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                                            type_annotation: TsTypeAnnotation {
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                                    colon_token: COLON@56..58 ":" [] [Whitespace(" ")],
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0: JS_MODULE@0..65
  0: (empty)
  1: (empty)
  2: JS_DIRECTIVE_LIST@0..0
  3: JS_MODULE_ITEM_LIST@0..64
    0: TS_DECLARE_STATEMENT@0..64
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      1: TS_EXTERNAL_MODULE_DECLARATION@8..64
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        1: JS_MODULE_SOURCE@15..19
          0: JS_STRING_LITERAL@15..19 "'x'" [] [Whitespace(" ")]
        2: TS_MODULE_BLOCK@19..64
          0: L_CURLY@19..20 "{" [] []
          1: JS_MODULE_ITEM_LIST@20..62
            0: JS_EXPORT@20..62
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              2: TS_DECLARE_FUNCTION_DECLARATION@30..62
                0: (empty)
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                2: JS_IDENTIFIER_BINDING@39..43
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                4: JS_PARAMETERS@43..56
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                  1: JS_PARAMETER_LIST@44..55
                    0: JS_FORMAL_PARAMETER@44..55
                      0: JS_DECORATOR_LIST@44..44
                      1: JS_IDENTIFIER_BINDING@44..50
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                      2: (empty)
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                        1: TS_ANY_TYPE@52..55
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                      4: (empty)
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                5: TS_RETURN_TYPE_ANNOTATION@56..62
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                  1: TS_VOID_TYPE@58..62
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                6: (empty)
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