JsModule {
    bom_token: missing (optional),
    interpreter_token: missing (optional),
    directives: JsDirectiveList [],
    items: JsModuleItemList [
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                await_token: missing (optional),
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                                    directives: JsDirectiveList [],
                                    statements: JsStatementList [],
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            semicolon_token: missing (optional),
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                await_token: missing (optional),
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            semicolon_token: missing (optional),
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  0: (empty)
  1: (empty)
  2: JS_DIRECTIVE_LIST@0..0
  3: JS_MODULE_ITEM_LIST@0..47
    0: JS_VARIABLE_STATEMENT@0..21
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        2: JS_VARIABLE_DECLARATOR_LIST@4..21
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            1: (empty)
            2: JS_INITIALIZER_CLAUSE@6..21
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              1: JS_FUNCTION_EXPRESSION@8..21
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                1: FUNCTION_KW@8..16 "function" [] []
                2: (empty)
                3: (empty)
                4: (empty)
                5: JS_PARAMETERS@16..19
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                  1: JS_PARAMETER_LIST@17..17
                  2: R_PAREN@17..19 ")" [] [Whitespace(" ")]
                6: (empty)
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                  0: L_CURLY@19..20 "{" [] []
                  1: JS_DIRECTIVE_LIST@20..20
                  2: JS_STATEMENT_LIST@20..20
                  3: R_CURLY@20..21 "}" [] []
      1: (empty)
    1: JS_VARIABLE_STATEMENT@21..47
      0: JS_VARIABLE_DECLARATION@21..47
        0: (empty)
        1: LET_KW@21..26 "let" [Newline("\n")] [Whitespace(" ")]
        2: JS_VARIABLE_DECLARATOR_LIST@26..47
          0: JS_VARIABLE_DECLARATOR@26..47
            0: JS_IDENTIFIER_BINDING@26..28
              0: IDENT@26..28 "b" [] [Whitespace(" ")]
            1: (empty)
            2: JS_INITIALIZER_CLAUSE@28..47
              0: EQ@28..30 "=" [] [Whitespace(" ")]
              1: JS_FUNCTION_EXPRESSION@30..47
                0: (empty)
                1: FUNCTION_KW@30..39 "function" [] [Whitespace(" ")]
                2: (empty)
                3: JS_IDENTIFIER_BINDING@39..42
                  0: IDENT@39..42 "foo" [] []
                4: (empty)
                5: JS_PARAMETERS@42..45
                  0: L_PAREN@42..43 "(" [] []
                  1: JS_PARAMETER_LIST@43..43
                  2: R_PAREN@43..45 ")" [] [Whitespace(" ")]
                6: (empty)
                7: JS_FUNCTION_BODY@45..47
                  0: L_CURLY@45..46 "{" [] []
                  1: JS_DIRECTIVE_LIST@46..46
                  2: JS_STATEMENT_LIST@46..46
                  3: R_CURLY@46..47 "}" [] []
      1: (empty)
  4: EOF@47..48 "" [Newline("\n")] []