error TS5102: Option 'downlevelIteration' has been removed. Please remove it from your configuration.


!!! error TS5102: Option 'downlevelIteration' has been removed. Please remove it from your configuration.
==== restParameterInDownlevelGenerator.ts (0 errors) ====
    // https://github.com/Microsoft/TypeScript/issues/30653
    function * mergeStringLists(...strings: string[]) {
        for (var str of strings);
    }