Variable LabelConst

Label: Union<
    readonly [
        String,
        mutable<
            Tuple<
                readonly [
                    String,
                    Struct<
                        {
                            count: mutableKey<optional<Number>>;
                            defaultValue: mutableKey<optional<String>>;
                            ns: mutableKey<Union<readonly [String, $Array<(...)>]>>;
                        },
                    >,
                ],
            >,
        >,
    ],
> = ...