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..5 "a" [] [],
                        },
                        variable_annotation: TsDefiniteVariableAnnotation {
                            excl_token: BANG@5..6 "!" [] [],
                            type_annotation: TsTypeAnnotation {
                                colon_token: COLON@6..8 ":" [] [Whitespace(" ")],
                                ty: TsStringType {
                                    string_token: STRING_KW@8..15 "string" [] [Whitespace(" ")],
                                },
                            },
                        },
                        initializer: JsInitializerClause {
                            eq_token: EQ@15..17 "=" [] [Whitespace(" ")],
                            expression: JsStringLiteralExpression {
                                value_token: JS_STRING_LITERAL@17..23 "\"test\"" [] [],
                            },
                        },
                    },
                ],
            },
            semicolon_token: SEMICOLON@23..24 ";" [] [],
        },
    ],
    eof_token: EOF@24..25 "" [Newline("\n")] [],
}

0: JS_MODULE@0..25
  0: (empty)
  1: (empty)
  2: JS_DIRECTIVE_LIST@0..0
  3: JS_MODULE_ITEM_LIST@0..24
    0: JS_VARIABLE_STATEMENT@0..24
      0: JS_VARIABLE_DECLARATION@0..23
        0: (empty)
        1: LET_KW@0..4 "let" [] [Whitespace(" ")]
        2: JS_VARIABLE_DECLARATOR_LIST@4..23
          0: JS_VARIABLE_DECLARATOR@4..23
            0: JS_IDENTIFIER_BINDING@4..5
              0: IDENT@4..5 "a" [] []
            1: TS_DEFINITE_VARIABLE_ANNOTATION@5..15
              0: BANG@5..6 "!" [] []
              1: TS_TYPE_ANNOTATION@6..15
                0: COLON@6..8 ":" [] [Whitespace(" ")]
                1: TS_STRING_TYPE@8..15
                  0: STRING_KW@8..15 "string" [] [Whitespace(" ")]
            2: JS_INITIALIZER_CLAUSE@15..23
              0: EQ@15..17 "=" [] [Whitespace(" ")]
              1: JS_STRING_LITERAL_EXPRESSION@17..23
                0: JS_STRING_LITERAL@17..23 "\"test\"" [] []
      1: SEMICOLON@23..24 ";" [] []
  4: EOF@24..25 "" [Newline("\n")] []
--
ts_definite_variable_with_initializer.ts:1:16 parse ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  × Declarations with initializers cannot also have definite assignment assertions.
  
  > 1 │ let a!: string = "test";
      │                ^^^^^^^^
    2 │ 
  
  i Annotation
  
  > 1 │ let a!: string = "test";
      │      ^^^^^^^^^
    2 │ 
  
--
let a!: string = "test";