JsModule {
    bom_token: missing (optional),
    interpreter_token: missing (optional),
    directives: JsDirectiveList [],
    items: JsModuleItemList [
        JsVariableStatement {
            declaration: JsVariableDeclaration {
                await_token: missing (optional),
                kind: LET_KW@0..4 "let" [] [Whitespace(" ")],
                declarators: JsVariableDeclaratorList [
                    JsVariableDeclarator {
                        id: JsIdentifierBinding {
                            name_token: IDENT@4..6 "a" [] [Whitespace(" ")],
                        },
                        variable_annotation: missing (optional),
                        initializer: JsInitializerClause {
                            eq_token: EQ@6..8 "=" [] [Whitespace(" ")],
                            expression: JsIdentifierExpression {
                                name: JsReferenceIdentifier {
                                    value_token: IDENT@8..13 "async" [] [],
                                },
                            },
                        },
                    },
                ],
            },
            semicolon_token: SEMICOLON@13..14 ";" [] [],
        },
    ],
    eof_token: EOF@14..15 "" [Newline("\n")] [],
}

0: JS_MODULE@0..15
  0: (empty)
  1: (empty)
  2: JS_DIRECTIVE_LIST@0..0
  3: JS_MODULE_ITEM_LIST@0..14
    0: JS_VARIABLE_STATEMENT@0..14
      0: JS_VARIABLE_DECLARATION@0..13
        0: (empty)
        1: LET_KW@0..4 "let" [] [Whitespace(" ")]
        2: JS_VARIABLE_DECLARATOR_LIST@4..13
          0: JS_VARIABLE_DECLARATOR@4..13
            0: JS_IDENTIFIER_BINDING@4..6
              0: IDENT@4..6 "a" [] [Whitespace(" ")]
            1: (empty)
            2: JS_INITIALIZER_CLAUSE@6..13
              0: EQ@6..8 "=" [] [Whitespace(" ")]
              1: JS_IDENTIFIER_EXPRESSION@8..13
                0: JS_REFERENCE_IDENTIFIER@8..13
                  0: IDENT@8..13 "async" [] []
      1: SEMICOLON@13..14 ";" [] []
  4: EOF@14..15 "" [Newline("\n")] []